Malicious RTF — malware analysis report

Static analysis result for SHA-256 1d5e3a50c967525b…

MALICIOUS

RTF

127.4 KB Created: 2017-08-17 04:29:00 First seen: 2017-08-27
MD5: 388bfa9a07f539f24447495ef739bdbe SHA-1: b92a59d7cdfdcdcdb01d101d96d93a319524411c SHA-256: 1d5e3a50c967525b1277457e792ac85e7851f47e54142d2c2f85891eed3bddbd
202 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is a known vulnerability for remote code execution. The exploit targets the OLE object linking and embedding functionality to fetch a payload from the URL https://fex.net/load/860659165481/33456649. This indicates a likely spearphishing attachment used to deliver a secondary stage payload.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • 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.
  • 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://fex.net/load/860659165481/33456649In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002878.bin rtf-objdata-decoded RTF \objdata at offset 0x2878 15126 bytes
SHA-256: 5ed7dafe5cbc939da921fa0a89ab71d2c1bf09fc8f9b7fbd24344f0d53dd8283

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