Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3fde1f1b262929ab…

MALICIOUS

RTF / .DOC

213.8 KB First seen: 2023-01-26
MD5: dc594706b3bea3a043c8075571f77f9c SHA-1: abf990ec9caa9aca16bef77950f0038e2cd5489d SHA-256: 3fde1f1b262929ab527ea2cc875ca3fc34828dcfb7179eca88512fb081509258
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The RTF document contains OLE objects and triggers heuristics related to CVE-2017-8570, indicating it exploits a vulnerability to drop a script. The document body explicitly prompts the user to 'Enable Editing', a social engineering tactic to bypass security measures and execute the embedded malicious content. This suggests a delivery mechanism for a second-stage payload.

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 9 \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_off00000bd0.bin
e3492b5663c148845d0dd64e4d83c547a64d0b0a8636275ce9217bf5243c4d23		 rtf-objdata-decoded RTF \objdata at offset 0xBD0 12928 bytes
objdata_01_off000073db.bin
0d5d09fb7e87d140659b8f662dc3a7b92cd848450a431d1974047996c57d1f01		 rtf-objdata-decoded RTF \objdata at offset 0x73DB 2632 bytes
objdata_02_off00008976.bin
c82b14168a11b2a6c2ffffb56a2145cdc03b85ac4b1ea43375e42bf801e53725		 rtf-objdata-decoded RTF \objdata at offset 0x8976 12261 bytes

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