Malicious RTF — malware analysis report

Static analysis result for SHA-256 e57853459cf8cf25…

MALICIOUS

RTF

44.1 KB Created: 2018-02-08 03:53:00 First seen: 2018-02-19
MD5: 37d8a86ea8610c63b30ebb2d1c8730d7 SHA-1: 637cf88e7ac854f4e0cb2c501f4f31748f4013d9 SHA-256: e57853459cf8cf2521ed19caf8c503eecddc8410373ad0b9447f34a4d2b3eac8
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://192.168.0.135/logo.txt to download and likely execute a secondary payload. This indicates a malicious document designed to deliver further malware.

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://192.168.0.135/logo.txt 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_off00002ac8.bin rtf-objdata-decoded RTF \objdata at offset 0x2AC8 2724 bytes
SHA-256: bc1995d50c40fc29de09b6aa66b310e0d5ed78adf256b5b3c104b65d229c01a8