Malicious RTF — malware analysis report

Static analysis result for SHA-256 72cef1e683e6be5e…

MALICIOUS

RTF

10.1 KB
MD5: 3173b648908483eb893c8b86008e973f SHA-1: aa381349e7c238c151f35c04b5af8317e01c8c0f SHA-256: 72cef1e683e6be5e24e630ea77f495d166a56b424b1ec7a3191c4024f5871648
120 Risk Score

Malware Insights

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

The RTF document contains critical heuristics indicating the use of the Equation Editor vulnerability (RTF_EQUATION_EDITOR) and an object update trigger (RTF_OBJUPDATE). This combination strongly suggests exploitation for client execution, likely as part of a spearphishing attachment. No specific malware family could be identified from the available evidence.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000131c.bin
28403c98c8f90fdfded2582fe774d3f0d31e50800ba0e1862dd403aa19eca95c		 rtf-objdata-decoded RTF \objdata at offset 0x131C 2006 bytes

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