Malicious Office (OLE) — malware analysis report

Heuristics 5

• ClamAV: Win.Trojan.Switcher-2 critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Win.Trojan.Switcher-2
• Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE
  A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
• Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
  OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
• OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
  This finding applies to a carved embedded Office document found at a nonzero offset inside the submitted file, not directly to the top-level document. OLE file is 21,406 bytes but its declared streams total only 0 bytes — 21,406 bytes (100%) 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).
• CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMS
  This finding applies to a carved embedded Office document found at a nonzero offset inside the submitted file, not directly to the top-level document. The file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.

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