Malicious RTF — malware analysis report

Static analysis result for SHA-256 0571e91b3d34b6df…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-08-04
MD5: a15541e9c40fdef0554535a88554edd3 SHA-1: 573100adc547b7fbfc6dee4b9c56854f92c3d988 SHA-256: 0571e91b3d34b6df965a30ba726eca87c7ccdce047fd8a1dd97fabba0a592eb4
182 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that leverages CVE-2017-0199 to fetch a payload from the specified URL. This exploit is commonly used to deliver secondary malware. The presence of the OLE object and the specific CVE firing strongly indicate an exploitation attempt.

Heuristics 5

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • 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
  • 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://206.189.94.161:8080// In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fa.bin rtf-objdata-decoded RTF \objdata at offset 0xFA 2724 bytes
SHA-256: e26c77257faffd2e548010ae75f1167a0fff4dd20fe2f9144c41971f6011f077

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