Cisco Secure Firewall - Intrusion Events by Threat Activity
This analytic detects intrusion events from known threat activity using Cisco Secure Firewall Intrusion Events. It leverages Cisco Secure Firewall Threat Defense IntrusionEvent logs to identify cases where one or…
Description
This analytic detects intrusion events from known threat activity using Cisco Secure Firewall Intrusion Events. It leverages Cisco Secure Firewall Threat Defense IntrusionEvent logs to identify cases where one or multiple Snort signatures associated with a known threat or threat actor activity have been triggered within a one-hour time window. The detection uses a lookup table (cisco_snort_ids_to_threat_mapping) to map Snort signature IDs to known threat actors and their techniques. When multiple signatures associated with the same threat actor are triggered within the time window, and the count of unique signatures matches or exceeds the expected number of signatures for that threat technique, an alert is generated. This helps identify potential coordinated threat activity in your network environment by correlating related intrusion events that occur in close temporal proximity. Currently, this detection will alert on the following threat actors or malware families as defined in the cisco_snort_ids_to_threat_mapping lookup: * AgentTesla * Amadey * ArcaneDoor * AsyncRAT * CastleRAT * Chafer * DCRAT * LokiBot * Lumma Stealer * Nobelium * Quasar * Remcos * Snake * Static Tundra * Xworm To add or update threat actors, update the cisco_snort_ids_to_threat_mapping.csv lookup file with new or modified threat names and associated Snort signature IDs.
Detection logic
Detection requirements
- Platform
- ESXiLinuxmacOSNetwork DevicesWindows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
- Log source category
- cisco_secure_firewall_threat_defense_intrusion_event
Known benign triggers
- False positives may occur due to legitimate security testing or research activities.
MITRE ATT&CK mappings
0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.
References
| Reference | Cited by |
|---|---|
| blog.talosintelligence.com/static-tundra/ | 9 |
| www.cisco.com/c/en/us/products/security/firewalls/index.html | Only this detection cites it |
From the source
- At source
- Open at source
- Upstream identifier
- b71e57e8-c571-4ff1-ae13-bc4384a9e891
- Tagged by the source as
- ArcaneDoorCisco Secure Firewall Threat Defense AnalyticsNetworknetworkSplunk CloudSplunk EnterpriseSplunk Enterprise Securitynetwork
Licence
- Published under
- Apache License 2.0Read the licence
- Attribution
- Required
- Obtained under
- Apache-2.0Read the origin licence
Authorship
- Published
- Oct 6, 2026
- Version
- 2