Malicious RTF — malware analysis report

Static analysis result for SHA-256 621cb7deda76883e…

MALICIOUS

RTF

129.3 KB Created: 2017-09-12 06:12:00 First seen: 2017-09-14
MD5: 1802e537a1d2febf1792db68c7a4eb8b SHA-1: d9e842f9a67bd242daf624c8e0af9b7d82db35bb SHA-256: 621cb7deda76883e6077639da7d1bc14c47246445808c508223e5c15122b7e67
202 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-0199, a known vulnerability for remote code execution. The exploit targets the URL https://fex.net/load/405793379845/45530526 to download and execute a secondary payload. This is a common technique for delivering malware via email attachments.

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/405793379845/45530526In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000277f.bin rtf-objdata-decoded RTF \objdata at offset 0x277F 13896 bytes
SHA-256: b9d9115393120f63fadf628f1d87594a8146daae7a4fe891f91daaace7a46acf

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