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

Static analysis result for SHA-256 8c014c85cf285298…

MALICIOUS

Office (OLE) / .DOC

801.5 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: d683599e9416e34ce2be832aa6a91985 SHA-1: ccd7a9d64b6cd47af8dcc3ba9bf4e3ac4f80f550 SHA-256: 8c014c85cf28529829c0afd4085e86e12045dfd22fbbbe86736107dfeb64427b
340 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1218.011 System Binary Proxy Execution: Rundll32

The sample is a malicious Microsoft Word document exploiting CVE-2006-6456, a known vulnerability related to malformed tables. Critical heuristics indicate the use of APIs such as VirtualAlloc, VirtualProtect, WriteProcessMemory, CreateRemoteThread, LoadLibrary, and GetProcAddress, strongly suggesting the document attempts to inject and execute shellcode. The large slack space in the OLE structure is also indicative of embedded malicious content.

Heuristics 8

  • 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.
  • Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY
    Reference to WriteProcessMemory API
  • Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD
    Reference to CreateRemoteThread API
  • 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 820,736 bytes but its declared streams total only 94,801 bytes — 725,935 bytes (88%) 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
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API

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