Malicious RTF — malware analysis report

Static analysis result for SHA-256 33ae664755def8e2…

MALICIOUS

RTF

5.6 KB First seen: 2019-12-09
MD5: 9d0ebf73e77d81801221fc7afa17ddae SHA-1: 28a639c54df4df17e597f17e6f30f689fd518cb3 SHA-256: 33ae664755def8e2b5a2b17d68a70dcfb71d19434d3a7ecd0fcbdc075880cd87
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This vulnerability allows the document to fetch and execute a payload from the embedded URL http://192.168.178.157:8080//. The embedded URL and the exploitation technique strongly indicate a malicious intent to download and run a secondary stage.

Heuristics 6

  • 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.
  • \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 http://192.168.178.157:8080// In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000119.bin rtf-objdata-decoded RTF \objdata at offset 0x119 2724 bytes
SHA-256: 9e950f687df0f38523846401335373236af0fdf30e81b57acfc407244c7c9a7f

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