Malicious RTF — malware analysis report

Static analysis result for SHA-256 7cdbaddefd0cebfb…

MALICIOUS

RTF

220.5 KB First seen: 2019-12-09
MD5: c4fdfc673fd3f1d4ba226669b3e9e869 SHA-1: 8f7c1a132476df1364f635359ddc68b25b6ab8d3 SHA-256: 7cdbaddefd0cebfb735599e483a9ebef36650a6a3d6d1ef44a3a421f111d561b
240 Risk Score

Malware Insights

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

The RTF file contains OLE object data and triggers heuristics related to CVE-2017-8570, indicating exploitation of a composite moniker vulnerability. This vulnerability is known to be used to drop and execute script files, such as SCT files, which are then likely used to download and run additional malicious payloads. The extracted artifact objdata_00_off00005193.bin is flagged as suspicious and contains shellcode command strings.

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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00005193.bin rtf-objdata-decoded RTF \objdata at offset 0x5193 7825 bytes
SHA-256: ddae4933ce5711b7ac6f1a8f28de897ddf32850cebf2335b7340fa287c068073
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript.Sh"
objdata_01_off00008fba.bin rtf-objdata-decoded RTF \objdata at offset 0x8FBA 12261 bytes
SHA-256: 04aa08ecdc0efa41170a070ca25860aacab1aa073c2b56e46d63ff336a7e2e8b
objdata_02_off0000efcc.bin rtf-objdata-decoded RTF \objdata at offset 0xEFCC 2632 bytes
SHA-256: 3795406577eaab90c19627b9afc3a8c3cdd408e8f6c1174ef0bb9f333f1afb70

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