Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d6dcf42227c7121a…

MALICIOUS

RTF / .DOC

254.0 KB
MD5: ff796fb7e29436608b1e3ab2ef2fe2d1 SHA-1: 42844f6fc84693868fbd59604b15e92c4e7b64dc SHA-256: d6dcf42227c7121a1dae639d8c22a5474e016605e0300909db70665b580ab8ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple OLE objects, including one that uses \objupdate to force activation. This, combined with the 'Please click Enable Editing to view the document.' lure, strongly suggests an attempt to execute embedded malicious content. The presence of composite monikers further indicates a sophisticated OLE object manipulation technique. No specific family could be identified, and no scripts or URLs were extracted for further analysis.

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.
  • \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 4 \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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000b4b.bin
d7a1c2a735937f6f7152efeaafc7c46661f072033582e634dccc850d467749f0		 rtf-objdata-decoded RTF \objdata at offset 0xB4B 33923 bytes
objdata_01_off00011556.bin
12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece		 rtf-objdata-decoded RTF \objdata at offset 0x11556 12261 bytes
objdata_02_off00017566.bin
3e20173573ecd45c8939b7e831a9cf85b4400150438f9db306f3dfd962c27af6		 rtf-objdata-decoded RTF \objdata at offset 0x17566 2632 bytes

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