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

Static analysis result for SHA-256 0f57baeb3070bf7a…

MALICIOUS

Office (OLE) / .DOC

179.5 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 9ef09819aa5d552ecb15067a14a33152 SHA-1: ecdf999cba48c5655c8120a4bf3237fee7570d9a SHA-256: 0f57baeb3070bf7a806f004ab61243aaf1b16f328e0c5f96d0c9128294d95b2c
260 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a Microsoft Word document that triggers a critical heuristic for CVE-2006-6456, indicating exploitation of a malformed table SPRM vulnerability. High-severity heuristics for VirtualAlloc, LoadLibrary, and GetProcAddress suggest the exploitation leads to the loading of external code. The presence of OLE slack anomaly further supports the likelihood of malicious content being hidden or injected. The ClamAV detection name 'Doc.Dropper.Agent' implies it's a dropper for further malicious payloads.

Heuristics 6

  • 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.
  • ClamAV: Doc.Dropper.Agent-1828511 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-1828511
  • 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 183,808 bytes but its declared streams total only 94,801 bytes — 89,007 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).
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API

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