Name:Cisco Secure Firewall - High Priority Intrusion Classification id:ec99bb81-c31b-4837-8c7d-1b32aa70b337 version:1 date:2025-04-28 author:Nasreddine Bencherchali, Splunk status:production type:TTP Description:This analytic identifies high-severity intrusion events based on the classification assigned to Snort rules within Cisco Secure Firewall logs.
It leverages Cisco Secure Firewall Threat Defense logs and focuses on events classified as:
- A Network Trojan was Detected
- Successful Administrator Privilege Gain
- Successful User Privilege Gain
- Attempt to Login By a Default Username and Password
- Known malware command and control traffic
- Known malicious file or file based exploit
- Known client side exploit attempt
- Large Scale Information Leak"
These classifications typically represent significant threats such as remote code execution, credential theft, lateral movement, or malware communication. Detection of these classifications should be prioritized for immediate investigation.
Data_source:
search:`cisco_secure_firewall` EventType=IntrusionEvent class_desc IN ("A Network Trojan was Detected", "Successful Administrator Privilege Gain", "Successful User Privilege Gain", "Attempt to Login By a Default Username and Password", "Known malware command and control traffic", "Known malicious file or file based exploit", "Known client side exploit attempt", "Large Scale Information Leak") | fillnull | stats count min(_time) as firstTime max(_time) as lastTime values(signature_id) as signature_id values(MitreAttackGroups) as MitreAttackGroups values(InlineResult) as InlineResult values(InlineResultReason) as InlineResultReason values(dest_port) as dest_port values(rule) as rule values(transport) as transport values(app) as app by src_ip, dest_ip, signature, class_desc | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `cisco_secure_firewall___high_priority_intrusion_classification_filter`
how_to_implement:This search requires Cisco Secure Firewall Threat Defense Logs, which
includes the IntrusionEvent EventType. This search uses an input macro named `cisco_secure_firewall`.
We strongly recommend that you specify your environment-specific configurations
(index, source, sourcetype, etc.) for Cisco Secure Firewall Threat Defense logs. Replace the macro definition
with configurations for your Splunk environment. The search also uses a post-filter
macro designed to filter out known false positives.
The logs are to be ingested using the Splunk Add-on for Cisco Security Cloud (https://splunkbase.splunk.com/app/7404).
The intrusion access policy must also be configured.
known_false_positives:Some intrusion events that are linked to these classifications might be noisy in certain environments. Apply a combination of filters for specific snort IDs and other indicators. References: -https://www.cisco.com/c/en/us/td/docs/security/firepower/741/api/FQE/secure_firewall_estreamer_fqe_guide_740.pdf drilldown_searches: name:'View the detection results for - "$dest_ip$" and "$src_ip$"' search:'%original_detection_search% | search dest_ip = "$dest_ip$" and src_ip = "$src_ip$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest_ip$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest_ip$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Cisco Secure Firewall Threat Defense Analytics' asset_type:Network security_domain:network mitre_attack_id: - 'T1203' - 'T1003' - 'T1071' - 'T1190' - 'T1078' product: - 'Splunk Enterprise' - 'Splunk Cloud' - 'Splunk Enterprise Security'
