Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5acf9ecf095c2eff…

MALICIOUS

Office (OLE)

63.9 KB Created: 2006-01-25 08:30:00 Authoring application: Microsoft Office Word
MD5: 64587d2b0f5c80a2a6874b737b0f5807 SHA-1: 525d3702845c21b32db06073d2d5d0f42cc94098 SHA-256: 5acf9ecf095c2eff84c445301000c05a3d5a86676a25d6755a513ec0d63699c5
80 Risk Score

Malware Insights

The sample is an OLE document that fired a heuristic for the CreateProcess API, indicating an attempt to launch an external process. The large slack space in the OLE structure is also anomalous. Without further script or body content, the exact nature of the payload and its delivery mechanism remain unclear.

Heuristics 2

  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 65,440 bytes but its declared streams total only 21,151 bytes — 44,289 bytes (68%) 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).

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