Malicious RTF — malware analysis report

Static analysis result for SHA-256 8dc8228fec352351…

MALICIOUS

RTF

49.7 KB Created: 2017-08-03 14:17:00 First seen: 2017-08-08
MD5: e5f98b1ceadc6c52924dec22fa559b7f SHA-1: 5c4e9acfa4d38c760b3f692aebe93aab8f23aff0 SHA-256: 8dc8228fec352351cebfe8f3d72410d84eff7ea36ab1dc130faa0d9f17dcd763
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is designed to download and execute 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 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \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.comIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003039.bin rtf-objdata-decoded RTF \objdata at offset 0x3039 3760 bytes
SHA-256: cd603d86d3858672eb59ffb5f5d1383030fac41e4305125e09e54fcdab2b1218

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