Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 cee467d59cdb20a2…

MALICIOUS

RTF / .DOC

29.1 KB First seen: 2022-12-07
MD5: fa0ba5082ddc66a0596ef36d28e4a8f2 SHA-1: 787f4476d09093018f8c7bdd0bf05c7495e80f8f SHA-256: cee467d59cdb20a2fb91f4f51b574a0f4fd00866f065b7761296449a1688740a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The RTF document contains an embedded OLE object specifically related to Equation Editor, triggering heuristics for CVE-2017-11882. The document also contains a lure instructing the user to 'Enable editing', a common tactic for macro-based malware. The embedded OLE object is likely designed to exploit the Equation Editor vulnerability to download and execute a secondary payload.

Heuristics 6

  • 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.
  • Split hex Equation Editor ProgID + OLE object critical 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.
  • 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 1 \objdata section(s) — embedded OLE objects
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00004b7a.bin
328163f1bd577232b4b439141235e738ada6c6e3c30865c309180ea4561fcd10		 rtf-objdata-decoded RTF \objdata at offset 0x4B7A 1916 bytes

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