Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 81c0f2e8e86715d3…

MALICIOUS

Office (OLE)

177.8 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 977dfd1b57c6e569a73daa71419bcb93 SHA-1: 5fb62f433f5f07b2d4800c707ce6fa903c6a95b3 SHA-256: 81c0f2e8e86715d36f09efa01a7b5b28157171182a255ba477da787f5feb4a4b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The file is a Microsoft Word document exhibiting OLE slack anomalies and an appended executable payload. A critical heuristic identified CVE-2006-6456, indicating exploitation of a malformed table SPRM vulnerability. VBA extraction failed due to an unsupported format, but the presence of appended payload bytes suggests the document is designed to drop and execute a secondary stage. The document body contains heavily garbled text, providing no clear lure.

Heuristics 4

  • CVE-2006-6456 — Microsoft Word malformed table SPRM critical CVE exact CVE_2006_6456
    WordDocument contains a malformed table border-color SPRM in the CVE-2006-6456 shape: a valid table-SPRM cluster is followed by an invalid high-byte 0xFF SPRM where Word expects a normal sprmTBrc*Cv record. Vulnerable Word 2000/2002/2003 parsers corrupt memory while handling this malformed data structure.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 182,020 bytes but its declared streams total only 94,801 bytes — 87,219 bytes (48%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (PermissionError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.

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