Malicious RTF — malware analysis report

Heuristics 5

• Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR
  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.
• Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
  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.
• Automatically linked OLE object high RTF_OBJAUTLINK
  RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
• \objupdate forces OLE activation high RTF_OBJUPDATE
  RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
• OLE object data medium RTF_OBJDATA
  RTF contains 2 \objdata section(s) — embedded OLE objects

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