Malicious RTF — malware analysis report

Static analysis result for SHA-256 44bc9b6d90acbea7…

MALICIOUS

RTF

43.6 KB
MD5: 277a4ddd9a69e745a92ecec346db0d9e SHA-1: 52f74acbc6a25b42feb5929a6b300ebafd4a0c5f SHA-256: 44bc9b6d90acbea73be946f51f028318cf86fd632cd90f7743d53f743cc92c37
120 Risk Score

Malware Insights

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

The RTF file contains OLE object data and specifically triggers heuristics for the Equation Editor vulnerability and object updates. This indicates the file is designed to exploit a known vulnerability to execute code, likely downloading a secondary payload.

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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001a48.bin
3cfeff12663152c0be6add06129467d603e2947be0bce8207ca3e9b43539fc31		 rtf-objdata-decoded RTF \objdata at offset 0x1A48 1356 bytes

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