Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 66bce51fd95478d5…

MALICIOUS

Office (OLE)

165.8 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: fa81f30eed9eba5acd45fc0770616b4f SHA-1: 1d6eff76eccb739075ba6838d62a3c560d818e4d SHA-256: 66bce51fd95478d5e89c346015a064e693d9291986e5d95e9c2161bf47a220d8
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a Microsoft Word document exhibiting OLE slack anomalies and an appended executable payload. It specifically triggers the CVE-2006-6456 heuristic, indicating exploitation of a malformed table SPRM vulnerability. This vulnerability allows for arbitrary code execution, likely to download and run a secondary payload.

Heuristics 3

  • 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 169,732 bytes but its declared streams total only 94,801 bytes — 74,931 bytes (44%) 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.

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