Malicious RTF — malware analysis report

Static analysis result for SHA-256 edad24aa12d7c318…

MALICIOUS

RTF

65.6 KB Created: 2017-07-25 12:33:00 First seen: 2018-03-04
MD5: 7692dc5abc235badd03741f93f883fb3 SHA-1: 07241b8576706b89bdc68e94b3c392f0a028cdb7 SHA-256: edad24aa12d7c3189910bdf9be0d2e27258f815493b85773f5a6db23938201c8
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and is flagged for exploitation of CVE-2017-0199. This vulnerability is used to automatically link to a remote URL, specifically http://159.8.24.196:8086/, which likely serves as a distribution point for a second-stage payload. The file's structure and the critical heuristic firings strongly indicate an exploit attempt.

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://159.8.24.196:8086/ 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_off00002c48.bin rtf-objdata-decoded RTF \objdata at offset 0x2C48 2601 bytes
SHA-256: 280383cbb832fb039f6809b001923ada9047b4d0ef9693d5580654d93cd7df11