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Network-Based Intrusion Detection

Network-based intrusion detection is crucial for identifying and mitigating Internet-based attacks. By correlating data from multiple sources, organizations can significantly improve their defensive capabilities. Contrary to popular belief, most attacks are not solely insider threats. Tools like WinNuke can cause system failures, such as the infamous "Blue Screen of Death." Solutions like Snort offer a cost-effective, lightweight option for monitoring network traffic with a low false alarm rate. Custom rules can be easily created to enhance detection capabilities, making it an essential tool for network security.

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Network-Based Intrusion Detection

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  1. FORESEC AcademySecurity Essentials (III) Network-Based IntrusionDetection

  2. Need for Network-basedIntrusion Detection • Most attacks come from the Internet • Detecting these attacks allows a site to tune defenses • If we correlate data from a large number of sources we increase our capability The statistic that 90% of all attacks are perpetrated by insiders is dead wrong.

  3. Inside a Network Attack WinNuke, (also called OOBNuke), uses TCP 139and OOB Data, even if NetBIOS is not enabled. It results in the “Blue Screen of Death”. Patches/service packs are available OOB stands for Out Of Band and is actually misnamed; it should say .Urgent mode., which is Urgent bit set in the TCP header flags and the urgent pointer.

  4. Nuke’eM Screen

  5. BlackIce – Nuke ‘Em Detection

  6. Network IntrusionDetection 101

  7. BlackIce - Enable Logging

  8. BlackIce - Viewing Logs

  9. BlackIce - Visualization Tools

  10. Libpcap-based Systems

  11. Network Intrusion DetectionWith Snort

  12. Snort Design Goals • Low cost, lightweight • Suitable for monitoring multiple sites/sensors • Low false alarm rate • Efficient detect system • Low effort for reporting

  13. Snort

  14. Writing Snort Rules • Can create custom rules to filter on specific content. • Pre-loaded with hundreds of rules (but you may need to create one or more custom rules) • Simple to write yet powerful enough to capture most types of traffic • Options - Basic (Pass, Log, Alert) - Advanced (Activate, Dynamic)

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