Malicious RTF — malware analysis report

Static analysis result for SHA-256 c7939b98e30c14d2…

MALICIOUS

RTF

3.7 KB
MD5: c5b9e601f2105ea20c83cb3a5ddd2967 SHA-1: 9f360d17ce45aa02e2ea93e04691a3fc2a4f0526 SHA-256: c7939b98e30c14d288bbd8acdd15fd8ef549ab765b34b826158ab60459cd6351
120 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability. This indicates an attempt to exploit a known vulnerability for client-side code execution. The presence of ".objupdate" further suggests that the embedded object is designed to be activated automatically, likely leading to payload execution.

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_off000000cf.bin
0e504573d2f8e6ce0d510972a8687f067e5573d6654de5ad8d3c99cc14c0158c		 rtf-objdata-decoded RTF \objdata at offset 0xCF 1581 bytes

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