Malicious RTF — malware analysis report

Static analysis result for SHA-256 05296b8d9cfe2373…

MALICIOUS

RTF

38.5 KB Created: 2017-08-22 05:57:00 First seen: 2017-08-27
MD5: f237f46b2acb4ca169ccf639a63fafae SHA-1: 83ff1f29fc7b28afafae6169e4d3e2582b2e6f4b SHA-256: 05296b8d9cfe23737cbc38c71a81b0d22976be2307d9a3202019047ba8123259
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 remote code execution. The exploit targets the URL http://192.168.50.250/ to download and execute a secondary payload. This indicates a malicious document designed to deliver malware via a spearphishing attachment.

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://192.168.50.250/ In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003123.bin rtf-objdata-decoded RTF \objdata at offset 0x3123 2724 bytes
SHA-256: af7843dab5b768e29cfd77a5af7b319e5a25cccb6e2df4c28e59b011948c842a

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