Malicious RTF — malware analysis report

Static analysis result for SHA-256 d55b0ba33022331d…

MALICIOUS

RTF

17.1 KB
MD5: 0102cdfb5c2cd28acd0550df73421c18 SHA-1: 90b13d9d91737e088ed0ced88e3a54c432eabd0e SHA-256: d55b0ba33022331d0dc93c6c4d1c01c1dbfb8428f9f1fade9fd46449d7d1c7c6
180 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data, specifically triggering the Equation Editor. Heuristics indicate exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor, which allows for arbitrary code execution. The presence of ".objdata" and ".objupdate" directives further confirms the attempt to activate and exploit the embedded object.

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_off00001265.bin
138faa674dab84ae9a55c4b64d1ad2a8041368cb34379d2f86927b115f10275e		 rtf-objdata-decoded RTF \objdata at offset 0x1265 2032 bytes

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