Malicious RTF — malware analysis report

Static analysis result for SHA-256 208bec0690fa1c51…

MALICIOUS

RTF

28.63 MB Created: 2021-05-24 10:35:00 First seen: 2021-05-29
MD5: 04cd6a6f880d720496e2ca22c39cf5cf SHA-1: 00fa2309f33b72c3dfb187494a9a961a9cbf29e8 SHA-256: 208bec0690fa1c51047f38937eb9e160e9fa7a24c40accfcb54b2586f56ac9c1
262 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of malicious activity, including OLE object data, Composite Moniker, and references to CVE-2017-8570 and CVE_2026_21514. These heuristics suggest the file is designed to exploit vulnerabilities to execute arbitrary code, likely downloading and running a secondary payload. The embedded artifact 'rtf_svb_00015f71.zip' is also flagged as suspicious.

Heuristics 8

  • 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.
  • CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
    RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2329KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • https://d.docs.live.net/4e7c0b36e71595b4/Escritorio/Universidad/JDNIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off01c645cf.bin rtf-objdata-decoded RTF \objdata at offset 0x1C645CF 4137 bytes
SHA-256: 6ae71405c48df15a40bbee3b2e8f0f64521203956720f4751b2fa90f772e9f01
rtf_svb_00015f71.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x15F71 8264 bytes
SHA-256: 52b516f1b57f2406d15a03d6fce2c4f52e5b2f4f1c1c9e7f3c86061bc6a253a2

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