Malicious RTF — malware analysis report

Static analysis result for SHA-256 0cdbf90da76e237b…

MALICIOUS

RTF

362.5 KB Authoring application: Riched20 10.0.17134 First seen: 2020-09-04
MD5: fe94b62d04a4b05f9fe094f262d88521 SHA-1: 09e43fe52de72ded217ff934db7964b305c73532 SHA-256: 0cdbf90da76e237bb839542005fe1812e07e357e3771e01f027c0c77f4e0ba59
140 Risk Score

Malware Insights

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

The RTF file contains multiple OLE objects, including embedded objects that trigger activation via \objupdate. The presence of a Composite Moniker and OlePres stream strongly suggests an attempt to exploit OLE object handling vulnerabilities for arbitrary code execution. This is a common technique for delivering malicious payloads via email attachments.

Heuristics 5

  • 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.
  • \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 6 \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 30056 bytes
SHA-256: 21c49ba3761621fbf43e0bc79fe260ad3a841d2196b616cbe1b5bd582f787976

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