Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6b816f1e3cf9ce01…

MALICIOUS

RTF / .DOC

179.0 KB
MD5: b577489c8ecf79a275b748995f35f51d SHA-1: 6e606fef28425725bf4eab22818e88fae5817b99 SHA-256: 6b816f1e3cf9ce01d809738d838f2d8817125b9ef1f2f853dfd8f74209590f15
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document that contains embedded OLE objects, specifically triggering heuristics related to Microsoft Equation Editor and CVE-2017-11882. This indicates the document is designed to exploit this vulnerability for code execution. The presence of ".objdata" and ".objupdate" sections further supports the exploitation of embedded objects. No specific family could be identified, but the attack pattern is consistent with a malicious document used for initial compromise.

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_off00001e89.bin
cc6f34927d80670347a4a497ab3dcebbf6ed44c875f64597a14349d54da1348f		 rtf-objdata-decoded RTF \objdata at offset 0x1E89 1736 bytes

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