Malicious RTF — malware analysis report

Static analysis result for SHA-256 c2928dea4a5a7014…

MALICIOUS

RTF

96.3 KB First seen: 2024-08-27
MD5: c5b33393804cbc8be7ea90ddd2a9f024 SHA-1: a053eb11e6accde418ac126a3c4780fef52b3cc7 SHA-256: c2928dea4a5a70145c1fbc7884775be78ab62b9b07b9c7253c4b107106d77119
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file 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. This combination strongly points to a client-side exploit designed to execute code, likely for downloading and running a second-stage 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_off0000186d.bin
7ff31d6a584c96e5ca284309cf42a043a59cae1f7db4480f5c0fbd7a2c6029b0		 rtf-objdata-decoded RTF \objdata at offset 0x186D 1993 bytes

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