Malicious Office (OOXML) / .DOCX — malware analysis report

Heuristics 8

• Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
  (in altChunk RTF word/Mauritania.rtf) RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
• altChunk imports embedded RTF (RTF injection) critical OOXML_ALTCHUNK_RTF
  Document inlines an embedded RTF via an aFChunk relationship and a <w:altChunk> body element. This is the canonical RTF-injection wrapper used to smuggle RTF exploits (Equation Editor / URL Moniker / objdata) past DOCX-only scanners. Word opens the wrapper and executes the RTF inline. Recursing into the RTF for the exact exploit primitive.
• Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
  (in altChunk RTF word/Mauritania.rtf) RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
• \objupdate forces OLE activation high RTF_OBJUPDATE
  (in altChunk RTF word/Mauritania.rtf) RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
• Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
  (in altChunk RTF word/Mauritania.rtf) RTF contains ~2829KB of hex-encoded data inside \objdata sections — may hide a payload
• OLE object data medium RTF_OBJDATA
  (in altChunk RTF word/Mauritania.rtf) RTF contains 2 \objdata section(s) — embedded OLE objects
• Embedded OLE object medium RTF_OBJEMB
  (in altChunk RTF word/Mauritania.rtf) RTF contains \objemb — embedded OLE object
• 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://opendope.org/xpaths

  • http://opendope.org/conditions
  • http://opendope.org/questions
  • http://opendope.org/components
  • http://opendope.org/SmartArt/DataHierarchy
  • http://schemas.openxmlformats.org/wordprocessingml/2006/main
  • http://schemas.openxmlformats.org/officeDocument/2006/math
  • http://schemas.openxmlformats.org/officeDocument/2006/relationships
  • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
  • http://schemas.openxmlformats.org/drawingml/2006/main
  • http://schemas.openxmlformats.org/schemaLibrary/2006/main
  • http://schemas.openxmlformats.org/drawingml/2006/chart
  • http://schemas.openxmlformats.org/drawingml/2006/chartDrawing
  • http://schemas.openxmlformats.org/drawingml/2006/diagram
  • http://schemas.openxmlformats.org/drawingml/2006/picture
  • http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing
  • http://schemas.microsoft.com/office/drawing/2008/diagram
  • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
  • http://schemas.openxmlformats.org/drawingml/2006/compatibility
  • http://schemas.openxmlformats.org/drawingml/2006/lockedCanvas

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