Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c1df39bf7228fdf6…

MALICIOUS

RTF / .DOC

212.4 KB
MD5: 049ebd8e42b9345f5c4c06840bcd0db5 SHA-1: 056e535d1fa02a53dec3fe292e9e1103ddbad31a SHA-256: c1df39bf7228fdf647c6ad5ed28f653e89778acf9b4f70bb59bd624be6e6a59c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 User Execution: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The RTF document contains multiple OLE object-related heuristics, including objdata, objemb, objupdate, and composite moniker. The document body explicitly instructs the user to 'click Enable Editing to view the document,' which is a common lure to bypass macro security settings. This suggests the document is designed to exploit OLE object vulnerabilities or trick the user into activating embedded content, likely to download and execute a secondary payload.

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 3 \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_off00000bd2.bin
5247913cfcbb1fad4cc98c42f75236eff00e1833d63069f5d8cd5770fa63dc34		 rtf-objdata-decoded RTF \objdata at offset 0xBD2 12582 bytes
objdata_01_off00006e96.bin
efcad781cab3d633c5a53c0b86b2c30761dd037463d8eb36ded19f59f1126d89		 rtf-objdata-decoded RTF \objdata at offset 0x6E96 2632 bytes
objdata_02_off00008431.bin
cfdf79b95584afe599f8bd01e391d8904839d9495e407a353433d3f5e3be3602		 rtf-objdata-decoded RTF \objdata at offset 0x8431 12261 bytes

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