Malicious RTF — malware analysis report

Static analysis result for SHA-256 6b91e4e5a5d6fc98…

MALICIOUS

RTF

53.6 KB Created: 2017-08-03 14:29:00 First seen: 2017-08-08
MD5: 71ff0b1a97536c7ba5662f3180a1b60b SHA-1: c4e17343e2825fe5712ca3da4d487ce2c77ebd21 SHA-256: 6b91e4e5a5d6fc98d458dc5cfcea7ad247a246508d2cd72258d7a414fad5ba4e
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-0199, a known vulnerability for client execution. The exploit targets the URL https://a.pomf.cat/nyxeve.hta, which is likely to host a second-stage payload. The presence of the weaponized URL and the OLE object strongly indicate a malicious intent to download and execute arbitrary code.

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 http://schemas.microsoft.c In RTF body
    • https://a.pomf.cat/nyxeve.htaIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002957.bin rtf-objdata-decoded RTF \objdata at offset 0x2957 3760 bytes
SHA-256: 1c953836d6a255224c5d2ab1263f14e7b2fb82750f01bf5255ca46ec6628e43d
objdata_01_off000049d0.bin rtf-objdata-decoded RTF \objdata at offset 0x49D0 2601 bytes
SHA-256: 2f00a50f9b097b4054cf53dd8cf986a40192403b6f0ad887abcf22683d782f62

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