Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a4626f93fb0dadc9…

MALICIOUS

Office (OLE)

32.0 KB Created: 1997-09-17 15:13:00 Authoring application: Microsoft Word 6.0
MD5: 5631f1684a8bd66ebce32688d4d92e7c SHA-1: a2256fe49977c333854c57ae6554c5feffd3c6b9 SHA-256: a4626f93fb0dadc9df10d7f5871fc5bf013ba2f54ebaa1eed8182a66fa0ffdbc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell

The file is an OLE document with a large slack space anomaly and contains an Excel 4.0 (XLM) macro sheet, indicating malicious intent. ClamAV detected it as Win.Trojan.Cap-1. The document body appears to be a generic agreement, likely a lure to encourage the user to enable macros. No scripts were extracted, but the presence of XLM macros suggests an attempt to execute arbitrary code.

Heuristics 3

  • ClamAV: Win.Trojan.Cap-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Cap-1
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 32,768 bytes but its declared streams total only 15,235 bytes — 17,533 bytes (54%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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