Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 80890d61c209d8ae…

MALICIOUS

Office (OLE)

634.1 KB First seen: 2015-09-24
MD5: 696ae791a18a27c92f8bdc08aa1575f0 SHA-1: 12d47bddce555ae32be0edcae32241926222d29a SHA-256: 80890d61c209d8ae64893421d79361ac4a3b578a1f727ad2982bae94e7cb6796
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a critical heuristic firing for Win.Exploit.Doc-9. Static analysis reveals a large slack space within the OLE structure and appended executable payload bytes, suggesting the document is designed to drop and execute a secondary malicious file. The lack of document body text or scripts prevents further analysis of the specific lure or payload.

Heuristics 3

  • ClamAV: Win.Exploit.Doc-9 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Exploit.Doc-9
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 649,304 bytes but its declared streams total only 24,874 bytes — 624,430 bytes (96%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.

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