Malicious Office (OLE) — malware analysis report

Heuristics 4

• Embedded Adobe Flash (SWF) in OLE document critical OFFICE_EMBEDDED_SWF
  Document contains an embedded Adobe Flash (SWF) object. Vulnerabilities such as CVE-2018-4878 and CVE-2018-15982 involved Flash objects embedded in Office files. Adobe Flash has been end-of-life since December 2020.
• OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
  OLE file is 288,844 bytes but its declared streams total only 51,906 bytes — 236,938 bytes (82%) 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.
• 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

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