Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 62a5b374fef19355…

MALICIOUS

Office (OLE)

206.5 KB Created: 2001-12-14 14:26:00 Authoring application: Microsoft Word 9.0
MD5: 3a29678d0b3338448f7584a67acdab5e SHA-1: 82e64881afee8477cee1a21b587a221f33ec622b SHA-256: 62a5b374fef193550314562f297fe84cdace51884c12b167cda5fabf9d47407c
320 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious Microsoft Word document exploiting CVE-2006-6456, a vulnerability in how Word handles malformed table SPRM data. Heuristics indicate the use of WinExec, CreateProcess, VirtualAlloc, LoadLibrary, and GetProcAddress APIs, suggesting the execution of arbitrary code. The suspicious invocation of cmd.exe with an execution flag further supports this. The document body contains heavily obfuscated and unreadable content, likely intended to hide malicious commands or payloads.

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 WinExec API high SC_STR_WINEXEC
    Reference to WinExec API
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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 211,456 bytes but its declared streams total only 94,801 bytes — 116,655 bytes (55%) 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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