Malicious RTF — malware analysis report

Static analysis result for SHA-256 e268f7ad5edd42c3…

MALICIOUS

RTF

250.6 KB Authoring application: Riched20 10.0.15063 First seen: 2021-07-10
MD5: d03f06e0ea7e67b1f3b4a2bd999ff99e SHA-1: e50c8b6f14ee49d57c872ccc05714ca353002f21 SHA-256: e268f7ad5edd42c3b416c6319b81e189587dc79a54c64af8ace5692595b0065c
100 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects, with heuristics indicating that \objupdate forces OLE activation. This suggests the file is designed to exploit vulnerabilities within OLE object handling to achieve client execution. The specific exploit or payload is not directly discernible from the static analysis, leading to an unknown family classification.

Heuristics 4

  • \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 5 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000010d.bin rtf-objdata-decoded RTF \objdata at offset 0x10D 24910 bytes
SHA-256: 3cda09137476e44fbcc899dde032f7deaf2dcbba9ee420b5eeb94ad0a45dbd03
objdata_01_off0000c95c.bin rtf-objdata-decoded RTF \objdata at offset 0xC95C 24910 bytes
SHA-256: 183a66aa46e6db566dc247a13f87588e179c69b45aae5e2662c2f4ef043a7103
objdata_02_off000191ab.bin rtf-objdata-decoded RTF \objdata at offset 0x191AB 24910 bytes
SHA-256: 7f77ea6531ec3e63880700f2933e35554df8ee460dc3b0bd3452ab32295978d7
objdata_03_off000259fa.bin rtf-objdata-decoded RTF \objdata at offset 0x259FA 24910 bytes
SHA-256: 5e8467cdbc0220be012fe7eeb1999b9c3636fffcfd2059e2bec581791cb03dad
objdata_04_off00032249.bin rtf-objdata-decoded RTF \objdata at offset 0x32249 24910 bytes
SHA-256: 6295d98dcb0a332680daa3619efcde550699ec460f344748c99beacb9fc10c93

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