Malicious RTF — malware analysis report

Static analysis result for SHA-256 f9b62830b7aa5463…

MALICIOUS

RTF

44.3 KB Created: 2017-11-14 08:03:00 First seen: 2017-11-20
MD5: 607a25ec8043328fb5255348ff715b9d SHA-1: e7158fecf778a58d2a8e958f2d164d947bf8d7d8 SHA-256: f9b62830b7aa54634a1b6f0390ac7e26f66b797e76721473fdf2f8e91fd343cb
142 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, indicated by the 'CVE_2017_0199' heuristic. This exploit targets a remote URL, specifically http://185.242.233.19/2/j2.doc, to download and execute a secondary payload. The document also contains a lure instructing the user to enable editing, which is a common tactic for malware droppers.

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.
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://185.24.233.19/2/j2.doc 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_off00003334.bin rtf-objdata-decoded RTF \objdata at offset 0x3334 3640 bytes
SHA-256: 92f9e45e8d743bde5ea91a5c5902e2c9de396bf3e17685170eaba0bcc4f4f874