Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ee8d8bdfb2f06a30…

MALICIOUS

RTF / .DOC

16.3 KB
MD5: 91db5ff2b98b47004be535eca9f5d205 SHA-1: 0fc850844d4cd6859c0a01590677932b16e8c316 SHA-256: ee8d8bdfb2f06a30a946615dc453017790047df7913ac89da167852dac53acb1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains embedded OLE object data, specifically triggering the Equation Editor. High-confidence heuristics indicate the activation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened, likely leading to the download and execution of a second-stage payload.

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_off000014d1.bin
e6a7c49c8b93dced8f8daf41955201c05dccfeb96bb27d1edbfb00cc72092505		 rtf-objdata-decoded RTF \objdata at offset 0x14D1 1444 bytes

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