Malicious RTF — malware analysis report

Static analysis result for SHA-256 607588508b900c16…

MALICIOUS

RTF

323.2 KB Authoring application: Riched20 10.0.17134 First seen: 2021-02-23
MD5: 4f6094992c095f9554fdc8e4f9de3605 SHA-1: e9d4e8c27b58e00a1d0091dab84e23413472dfe2 SHA-256: 607588508b900c16cd9e15f5b658af8f6e876f54abad3c84e178bda5d8afb741
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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000113.bin rtf-objdata-decoded RTF \objdata at offset 0x113 32160 bytes
SHA-256: 551c616766420877f2a3d40d5f880a145a776c6414027a6e6a321fd9e0c1581d
Detection
ClamAV: Xls.Malware.Sload-7135989-0
Obfuscation or payload: unlikely

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