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

Static analysis result for SHA-256 4698aa9c141b6a54…

MALICIOUS

Office (OLE) / .DOC

61.1 KB Created: 2006-04-29 01:29:00 Authoring application: Microsoft Office Word
MD5: ed2d2418975c7ebcdf2545e9b3fb0c8f SHA-1: 49546cc01676c3306b65526bebd5884e2ce62343 SHA-256: 4698aa9c141b6a54a335237fb23594a908cff9398906f12ea9d39dc9efcc29c7
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell T1059.005 Visual Basic

The file is detected as malicious by ClamAV as Win.Dropper.Agent-34370. Heuristics indicate the presence of API calls related to process creation (CreateProcess), memory allocation (VirtualAlloc), and dynamic library loading (LoadLibrary, GetProcAddress), suggesting the execution of shellcode. The large slack space in the OLE structure is also anomalous. Although VBA macros could not be extracted, the combination of these indicators points to a dropper functionality.

Heuristics 8

  • ClamAV: Win.Dropper.Agent-34370 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-34370
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess 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 62,581 bytes but its declared streams total only 26,783 bytes — 35,798 bytes (57%) 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
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (PermissionError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.

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