A New Detection Framework
Summary: Cisco Talos's Vulnerability Research Team described NRT, a Near Real Time detection project that uses Snort as a data source to pull files off the wire and pass them to out-of-band detection modules, including a PDF parser, ClamAV, and a logging module. In its proof of concept, the PDF parser detected a probable exploit of CVE-2009-0658 (JBIG2) in object 8, flagged high-entropy JavaScript variable names, and identified reverse TCP connectback shellcode connecting to 10.4.4.10 on port 4444 from unescaped data in a compressed PDF object.
Key Takeaway: The system caught shellcode by interpreting unescaped, compressed JavaScript inside a PDF pulled off the wire, not by seeing traffic to port 4444, which means detection depended on parsing file internals rather than watching the network for the callback.
Read the original at Cisco Talos ↗
- Topics
- Detection & Response
- Mentions
- CVE-2009-0658
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