Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6c9b47702eaabe12…

MALICIOUS

RTF / .DOC

26.4 KB First seen: 2022-11-16
MD5: 3f194f468431f0e7cbd29794003cfa1e SHA-1: 48d8d67af4ac260ebe89f33e4743572df1b77ac8 SHA-256: 6c9b47702eaabe124bfe5949d116203fb8c72d24a052aefcd3bad041bfcbabe2
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object specifically targeting the Equation Editor vulnerability (CVE-2017-11882). The presence of \objupdate and \objdata sections, along with the critical RTF_EQUATION_EDITOR heuristic, strongly indicates an attempt to exploit this known vulnerability for arbitrary code execution. The document body itself contains a lure to 'Enable editing', further supporting the malicious intent.

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_off00004c62.bin
5f6917cb732a75d1acf080470b25e6782d2a5b4bdfb7bc1d50db31d6ab25382e		 rtf-objdata-decoded RTF \objdata at offset 0x4C62 1654 bytes

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