Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6329d2b46abffc50…

MALICIOUS

RTF / .DOC

3.2 KB First seen: 2022-12-19
MD5: 7098115ca2335c72ab8442bc0b6a2ab6 SHA-1: baf1fcae077b05d5686eb641f93c51113f308c5c SHA-256: 6329d2b46abffc500a9c0a0adc51073db28c10d00727befeb480e4e0832d238b
200 Risk Score

Malware Insights

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

The RTF document contains an OLE object with obfuscated Equation Editor details, strongly indicating an attempt to exploit CVE-2017-11882. The presence of \objdata and \objupdate directives further suggests that the embedded object is designed to be automatically activated, leading to arbitrary code execution. No specific malware family is identifiable from the provided heuristics.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000007f.bin
e762a10c2f6181faa669e4fb4a0ec112fc9f3f9bf84d13716df06d62f63b8875		 rtf-objdata-decoded RTF \objdata at offset 0x7F 1528 bytes

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