Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 602c5ec2717297b7…

MALICIOUS

Office (OLE) / .DOC

231.0 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 969a91d2085ecaf45a1a32cec993fedd SHA-1: ed2794c15213a40b101009df24835ffc3e336a81 SHA-256: 602c5ec2717297b779731c6d73d708b26f65430625a99462b4700a2a60e00475
300 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1203 Exploitation for Client Execution

The sample is a Microsoft Word document exhibiting a critical heuristic for CVE-2006-6456, indicating exploitation of a malformed table structure. High-severity heuristics for PEB access and API hash resolution suggest sophisticated evasion techniques. The large appended payload and OLE slack anomaly point to the embedding of executable content, likely a secondary stage. No document body or script content was available for further analysis, but the exploit itself is sufficient to infer malicious intent.

Heuristics 7

  • 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.
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • PEB API-hash resolver high SC_API_HASH_RESOLVER
    PEB access followed by ROR13-style API hashing, a common position-independent shellcode import resolver
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 236,545 bytes but its declared streams total only 94,801 bytes — 141,744 bytes (60%) 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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