Malicious RTF — malware analysis report

Static analysis result for SHA-256 b48be469b1301dfc…

MALICIOUS

RTF

71.6 KB Created: 2017-08-24 04:13:00 First seen: 2017-08-27
MD5: 772828e6ef632ad8e153e5e3c900414d SHA-1: 8c0d6482c419fd8a56be4101d611cd98f2c43bd6 SHA-256: b48be469b1301dfc444ac315499c925f76068fdeb01f61a0156955249d6c1129
202 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object that exploits CVE-2017-0199, a known vulnerability for remote code execution. The exploit targets the URL http://203.248.116.182/images/opt.hta, which likely serves as a second-stage payload. The presence of ClamAV detection for Rtf.Exploit.CVE_2017_0199-6335035-0 further confirms the malicious nature of the file.

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 http://203.248.116.182/images/opt.hta}{ In RTF body
    • http://203.248.116.182/images/opt.htaIn RTF body
    • https://www.ana.co.jp/book-plan/airinfo/timetable/domestic/In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • https://www.ana.co.jp/asw/index.jsp?type=iIn RTF body
    • https://www.ana.co.jp/domtour/In RTF body
    • https://www.ana.co.jp/asw/AMCTopServlet?type=aIn RTF body
    • https://www.ana.co.jp/book-plan/reservation/In RTF body
    • http://www.ana.co.jp/fs/dom/jp/In RTF body
    • https://www.ana.co.jp/book-plan/airinfo/timetable/doIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000037b6.bin rtf-objdata-decoded RTF \objdata at offset 0x37B6 5932 bytes
SHA-256: 45029ae3bc518466682b1ffa4351b0c76d219052e40c077f3c219c131d3495c9

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