Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2c04c85574c7d733…

MALICIOUS

RTF / .DOC

27.7 KB First seen: 2022-12-29
MD5: 8396fbf323f892240d754e64c110d563 SHA-1: 1ae0ca1d294666162517b5b54a87764e7a7e1ff8 SHA-256: 2c04c85574c7d73306a13eb69ebd264135cb79501020841a0d1b3eed4e42082a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1559.001 Component Object Model Hijacking T1059.005 PowerShell

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The document body contains a lure instructing the user to 'Enable editing' to view the content. This lure, combined with the embedded OLE object and the specific Equation Editor ProgID, strongly indicates a malicious document designed to exploit this known vulnerability for initial execution.

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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off00004f7e.bin
d5c6c6c3c3e96f55d907ba907e989dd1b4e4f649c4ce53323530593bc1a6c71b		 rtf-objdata-decoded RTF \objdata at offset 0x4F7E 1767 bytes

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