Malicious RTF — malware analysis report

Static analysis result for SHA-256 342e6994074fee57…

MALICIOUS

RTF

53.7 KB Created: 2017-08-03 14:29:00 First seen: 2017-08-08
MD5: 6f7fe060d090d3f50ac342502d8a2df8 SHA-1: 99745ad490d2a6385e15d6c81f58f76b6db6c125 SHA-256: 342e6994074fee578cdd6b36f18e6e90b15c91b30c84a1902afbe75e399d1b58
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and is weaponized to exploit CVE-2017-0199. It automatically links to and downloads a HTA file from the URL https://a.pomf.cat/nyxeve.hta, which is likely to contain malicious JavaScript or other executable content. This indicates an attempt to execute arbitrary code on the victim's machine.

Heuristics 5

  • 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 2 \objdata section(s) — embedded OLE objects
  • 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/nyxeve.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000029dc.bin rtf-objdata-decoded RTF \objdata at offset 0x29DC 3760 bytes
SHA-256: 47291ffd27483486a82f80e65453a172f8fdb6c06e7df64e0d4b27fc5a5af51b
objdata_01_off00004a32.bin rtf-objdata-decoded RTF \objdata at offset 0x4A32 2601 bytes
SHA-256: 041b847c93325ec0921c70ef066bcdae822e4a615bb8a974d509c5aee1b42b56

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