Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a716575562220419…

MALICIOUS

RTF / .DOC

10.3 KB First seen: 2022-07-01
MD5: fbed96640a6b35aaa55b000ae1170b64 SHA-1: 0b125fa07d71bd06f60d71d83ab57b8f03bb980f SHA-256: a716575562220419ebc5b427136ec1394523b8c65c6fd4ab1a0067a6a76ad77b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an RTF document containing an embedded OLE object that exploits CVE-2017-11882 through the Equation Editor. The heuristics indicate a critical vulnerability related to Equation Editor activation and object updates, strongly suggesting arbitrary code execution. The document body content appears to be unrelated financial or inventory data, likely a lure.

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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000015b4.bin
742b98a145d8c1631297b88c3464dc3522c3f964b37cf4ba9ddd325165257f9e		 rtf-objdata-decoded RTF \objdata at offset 0x15B4 1782 bytes

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