Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d09a804398b38081…

MALICIOUS

RTF / .DOC

13.8 KB
MD5: 6bd6345769283955da827076b3dbe2f0 SHA-1: 1b0cb8e1afca948d265681b0faa36144c349b698 SHA-256: d09a804398b380810373f45defe68ce6bc057e7d803f22fa93253fe05043ff44
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 objects, specifically triggering heuristics related to Equation Editor. The critical firing 'RTF_EQUATION_EDITOR' and high firing 'CVE_2017_11882_ACTIVATION_RELATED' strongly indicate the exploitation of the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the embedded object is activated, likely leading to the download and execution of a secondary 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_off00001a62.bin
01d6315e0e704698f593cc00d97193ae2e3f20e069dea349c5761d11635b175b		 rtf-objdata-decoded RTF \objdata at offset 0x1A62 1275 bytes

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