Malicious RTF — malware analysis report

Static analysis result for SHA-256 83a214014f4348ee…

MALICIOUS

RTF

47.0 KB Created: 2017-09-18 16:34:00 First seen: 2017-10-10
MD5: fe8a14b2d5d305e811e19e495b0ae483 SHA-1: 087912e0b6cb4a84882557845bfc69ceea7af822 SHA-256: 83a214014f4348ee35cb146b369a3c13fb88da03caf09c45f22b3b271724bc28
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://172.18.100.56/exploit.txt to download and execute a secondary payload, indicating a downloader or dropper functionality. The presence of the OLE object and the specific CVE exploit strongly suggest a malicious intent.

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://172.18.100.56/exploit.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_off00002c10.bin rtf-objdata-decoded RTF \objdata at offset 0x2C10 2724 bytes
SHA-256: caacd582c02f96e30d217552d661e9ba14e1c4aca2b3057c0b34f756ab98315c