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Cisco Secure Firewall - Rare Snort Rule Triggered

Splunk Security Content

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Summary
This detection rule identifies unusual triggering of Snort signatures within Cisco Secure Firewall IntrusionEvent logs. It focuses on cases where signatures have been triggered only once over the past week, a scenario that may hint at atypical network behavior such as compromise attempts, undetected malware, or reconnaissance on less exposed services. By isolating these rare triggers, network defenders can gain insights into potential emerging threats or low-frequency adversary tactics. The rule employs a search query that summarizes the occurrences of each signature and flags those that show an anomaly in frequency, specifically a single trigger in the last seven days, enabling targeted investigation of potentially suspicious activity.
Categories
  • Network
Data Sources
  • Pod
  • Network Traffic
  • Process
  • Application Log
  • Container
ATT&CK Techniques
  • T1598
  • T1583.006
Created: 2025-04-14