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

Static analysis result for SHA-256 8bf3335b29118466…

MALICIOUS

Office (OLE) / .DOC

105.0 KB Created: 2005-06-29 18:14:00 Authoring application: Microsoft Word 10.0
MD5: fd21f4c113630c28026821cfe2bda490 SHA-1: ddf8d9cbf71c02c152c5934907d6cef11e0b78ce SHA-256: 8bf3335b29118466af6f079cb95dc91616017220fed46001f58083472799ef6a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The OLE document exhibits anomalies with a large slack region and appended executable-looking payload bytes, strongly suggesting it functions as a dropper. Although VBA macros could not be extracted due to an unsupported format, the presence of appended data and the file's malicious verdict indicate it is designed to deliver additional malware. The appended payload is the primary IOC.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 107,520 bytes but its declared streams total only 20,632 bytes — 86,888 bytes (81%) 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.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.terrapinn.com/2010/stemcells/programme.stm