Cisco Secure Firewall - Lumma Stealer Outbound Connection Attempt

Name:Cisco Secure Firewall - Lumma Stealer Outbound Connection Attempt
id:66f22f52-fbae-4be7-a263-561dacb63612
version:1
date:2025-04-26
author:Nasreddine Bencherchali, Splunk, Talos NTDR
status:production
type:Anomaly
Description:This analytic detects Lumma Stealer outbound connection attempts using Cisco Secure Firewall Intrusion Events. It leverages Cisco Secure Firewall Threat Defense IntrusionEvent logs to identify cases where Snort signatures with IDs 64797, 64798, 64799, 64800, 64801, 64167, 64168, 64169, 62709 have been triggered. If confirmed malicious, this behavior could indicate an active infection of Lumma Stealer.
Data_source:

• -Cisco Secure Firewall Threat Defense Intrusion Event

search:`cisco_secure_firewall` EventType=IntrusionEvent signature_id IN (64797, 64798, 64799, 64800, 64801, 64167, 64168, 64169, 62709)
| fillnull
| stats min(_time) as firstTime max(_time) as lastTime
by src_ip dest_ip dest_port transport signature_id signature class_desc MitreAttackGroups rule InlineResult InlineResultReason app
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `cisco_secure_firewall___lumma_stealer_outbound_connection_attempt_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:False positives should be unlikely.
References:
  -https://malpedia.caad.fkie.fraunhofer.de/details/win.lumma
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'
    - 'Lumma Stealer'
  asset_type:Network
  security_domain:network
  mitre_attack_id:
    - 'T1041'
    - 'T1573.002'
  product:
    - 'Splunk Enterprise'
    - 'Splunk Cloud'
    - 'Splunk Enterprise Security'

tests:
 name:'True Positive Test'
 attack_data:
  data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/cisco_secure_firewall_threat_defense/lumma_stealer/lumma_stealer_events.log
  source: not_applicable
  sourcetype: cisco:sfw:estreamer
manual_test:None