Malicious RTF — malware analysis report

Static analysis result for SHA-256 e33732301e60837a…

MALICIOUS

RTF

53.7 KB Created: 2017-08-03 14:29:00 First seen: 2017-08-08
MD5: 6a6de2b25ab1b654cf65d29f5e69f544 SHA-1: 982366134bed5c07075961c0cb0b87418445c3d8 SHA-256: e33732301e60837a838a1ff3eb556141187717a2d34bf692bb5161d9fa6af4f1
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object that exploits CVE-2017-0199. This exploit is designed to download and execute a payload from a weaponized URL. The embedded URL, https://a.pomf.cat/nyxeve.hta, is highly suspicious and likely serves as the second-stage payload. The ClamAV detection further confirms the malicious nature of the file.

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_off00002a0d.bin rtf-objdata-decoded RTF \objdata at offset 0x2A0D 3760 bytes
SHA-256: 47291ffd27483486a82f80e65453a172f8fdb6c06e7df64e0d4b27fc5a5af51b
objdata_01_off00004a63.bin rtf-objdata-decoded RTF \objdata at offset 0x4A63 2601 bytes
SHA-256: 041b847c93325ec0921c70ef066bcdae822e4a615bb8a974d509c5aee1b42b56

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