Malicious RTF — malware analysis report

Static analysis result for SHA-256 de88c6109e288ef7…

MALICIOUS

RTF

43.5 KB Created: 2017-09-11 02:26:00 First seen: 2017-09-14
MD5: 6192e3d81c82f0770d6e493d08d965c3 SHA-1: 85884ec2639a64652a83cf185c58c43b4add0064 SHA-256: de88c6109e288ef724fc6167b5adf46dd06c36912f6a6c7507c8ba19492e62e7
202 Risk Score

Malware Insights

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

The RTF document contains an OLE object that exploits CVE-2017-0199. This exploit is designed to download and execute a remote HTA payload from the URL https://a.pomf.cat/zychzr.hta. The presence of the weaponized URL and the ClamAV detection strongly indicate malicious intent.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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 https://a.pomf.cat/zychzr.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000027ea.bin rtf-objdata-decoded RTF \objdata at offset 0x27EA 4664 bytes
SHA-256: 93b68346e76cb374198e010c010eb08810f6cf994b10b836c325f2a4adbdda06

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