Malicious RTF — malware analysis report

Static analysis result for SHA-256 ecff20c73939355c…

MALICIOUS

RTF

43.5 KB Created: 2017-07-27 12:23:00 First seen: 2017-08-08
MD5: 0e25b5f379c02373d17e6e8e58601fe6 SHA-1: 91d4f48a844b6f56348a8fa1038a2aba6f1aabb5 SHA-256: ecff20c73939355c0acf977aefab8ac694babcdd557462bb18f8464f0e47e3fb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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://a.doko.moe/nezdrw.hta, which is likely to host a malicious HTA payload. This indicates a pattern of exploiting a known vulnerability to download and execute a secondary payload.

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.doko.moe/nezdrw.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_off0000280e.bin rtf-objdata-decoded RTF \objdata at offset 0x280E 4664 bytes
SHA-256: 6cb1396d624e925fd28551da18d0f78c947f88866b8b99ed25cd4bafb4d7d218

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