Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ea2bf0d849a44cf6…

MALICIOUS

RTF / .DOC

96.7 KB
MD5: 4a5bdf87ba9e4d51f9cd50ad96263db3 SHA-1: 87e0723e4be70a3c75c9b531bfdc792d9d13d0d9 SHA-256: ea2bf0d849a44cf65e2fe9bddd0c37fd22da5a807b5a6605c6c3eae859da6418
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for arbitrary code execution, likely delivered via spearphishing.

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_off00000c23.bin
bc20f3a4d1c064b97adedb9d44fa07a4f0c5a78d43786add8ab29c248e7cdd8e		 rtf-objdata-decoded RTF \objdata at offset 0xC23 1803 bytes

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