Malicious RTF — malware analysis report

Static analysis result for SHA-256 35b48cacf7719ec1…

MALICIOUS

RTF

402.0 KB Authoring application: Riched20 10.0.17134 First seen: 2021-02-20
MD5: 6c5ee97c0fd50cfea704a1ee5663a701 SHA-1: 289bdd054eefbbddddcde69e996a9dbd280661bf SHA-256: 35b48cacf7719ec1a06948150c1a49e252ce56ab914bec2b7674912ce05c475b
260 Risk Score

Heuristics 6

  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
  • \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000113.bin rtf-objdata-decoded RTF \objdata at offset 0x113 40022 bytes
SHA-256: 804c817cbef4a865c7a08f212533fec64ef44ca520e27858a2b1fc859e04fd15
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely
objdata_03_off0003c54e.bin rtf-objdata-decoded RTF \objdata at offset 0x3C54E 40022 bytes
SHA-256: f22d51b9e3df5c8775536a1f026605a0fc0226eb8fe693072f035c7d1b621767
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely

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