Malicious RTF — malware analysis report

Static analysis result for SHA-256 cea0c90943deb863…

MALICIOUS

RTF

104.8 KB First seen: 2024-07-07
MD5: 676625147bab9286090789f41c1ddee7 SHA-1: 0139cbf7e38bb6ef5f178b19830f8ba2f6679c2c SHA-256: cea0c90943deb863cf24e727b78c88ce22a58d005e2b49c11f67247246b0bcec
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains OLE object data and specifically triggers the RTF_EQUATION_EDITOR heuristic, indicating exploitation of the Equation Editor vulnerability. The RTF_OBJUPDATE heuristic suggests that the embedded OLE object is automatically activated upon opening the document. This combination strongly suggests the file is designed to exploit this vulnerability to achieve code execution, likely for downloading and running 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000105a.bin
21efb88d23d5e86cd0b2cf5aebcb7e741b01b6d5783ed901d7aade465ccd3c31		 rtf-objdata-decoded RTF \objdata at offset 0x105A 2042 bytes

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