Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 14ddf02880f65ccc…

MALICIOUS

RTF / .DOC

254.0 KB
MD5: 11a63b2b33ccf16f02528e9c650859e5 SHA-1: 68fbdc4f16511fd33d381f5028adc427d1db34e4 SHA-256: 14ddf02880f65ccc082f8f1984c1a8d0c3101781c7ad58a183746b32486e6615
220 Risk Score

Malware Insights

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

The RTF document contains multiple OLE objects and uses a lure to encourage users to enable editing, which is a common tactic for malware droppers. The critical heuristic firing for CVE-2017-8570 indicates the exploitation of a vulnerability that drops a script, likely for further execution. The presence of OLE object data and composite monikers strongly suggests an attempt to execute embedded code.

Heuristics 7

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • 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
107ebf56de94f09599265b288a92ebbd73eb286d86ba1134983159333789ddbf		 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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