Malicious RTF — malware analysis report

Static analysis result for SHA-256 e052254bf3dff4bf…

MALICIOUS

RTF

43.1 KB First seen: 2025-10-31
MD5: acb062e2f1b621e45888c2b97709d18e SHA-1: 00aa2454a00e9e257c9b026b1abcb0221e1e4cb1 SHA-256: e052254bf3dff4bf2c660afd72a517520b410bb3ede43bc1d4e8ee2224b39e9e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains OLE object data and specifically triggers the Equation Editor vulnerability, forcing OLE activation. This indicates an attempt to exploit a known vulnerability for code execution. The embedded OLE object data is likely a payload designed to download and execute a secondary stage, though the specific details of the payload are not visible in the provided evidence.

Heuristics 4

  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000f26.bin
15f8f3a0e3080f1f06d705ab7bb35b653796898d2fdf863577d37916cb01015f		 rtf-objdata-decoded RTF \objdata at offset 0xF26 1564 bytes

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