Malicious RTF — malware analysis report

Static analysis result for SHA-256 c1daa58b74597e89…

MALICIOUS

RTF

41.6 KB Created: 2018-11-06 21:14:00 First seen: 2019-02-26
MD5: c0b6da7aad7d4b4b437e898ff05aa329 SHA-1: 13657122838bdd71926b94c96354050d21e01d0c SHA-256: c1daa58b74597e8902061469c8ab2763fc7d07cc1148efb5ea7690d5bf06b6e6
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 attempts to download a secondary payload from the URL http://192.168.70.130/hi.rtf, indicating a downloader or dropper functionality. The file is classified as malicious due to this exploit.

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://192.168.70.130/hi.rtf 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_off00002ae5.bin rtf-objdata-decoded RTF \objdata at offset 0x2AE5 2601 bytes
SHA-256: e6879c8b62b1c934a1a2ce04ad7a13b1b4b2ee9b42e4793fda0b65b43a85793e