Cisco Secure Firewall - Lumma Stealer Download Attempt

Description

This analytic detects Lumma Stealer download 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 have been triggered. If confirmed malicious, this behavior could indicate an active infection of Lumma Stealer.

Query · spl

`cisco_secure_firewall` EventType=IntrusionEvent signature_id IN (62710, 62711, 62712, 62713, 62714, 62715, 62716, 62717, 64810, 64811)
| fillnull
| stats min(_time) as firstTime max(_time) as lastTime
        by src dest 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_download_attempt_filter`

Implementation guide

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.

Analyst notes

Known false positives: False positives should be unlikely.

Raw source Cisco Secure Firewall - Lumma Stealer Download Attempt · SPL
Esc
Published by splunk/security_content ↗, licensed under Apache 2.0 ↗. Reproduced here unmodified. 
name: Cisco Secure Firewall - Lumma Stealer Download Attempt
id: 66f22f52-fbae-4be7-a263-561dacb63613
version: 7
creation_date: '2025-04-16'
modification_date: '2026-05-13'
author: Nasreddine Bencherchali, Splunk, Talos NTDR
status: production
type: Anomaly
description: |
    This analytic detects Lumma Stealer download 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 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 (62710, 62711, 62712, 62713, 62714, 62715, 62716, 62717, 64810, 64811)
    | fillnull
    | stats min(_time) as firstTime max(_time) as lastTime
            by src dest 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_download_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 - "$dest$" and "$src$"
      search: '%original_detection_search% | search  dest = "$dest$" and src = "$src$"'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
    - name: View risk events for the last 7 days for - "$dest$"
      search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | 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: 7d
      latest_offset: "0"
intermediate_findings:
    entities:
        - field: dest
          type: system
          score: 20
          message: Lumma Stealer Download Attempt detected on host $dest$ origniating from $src$
threat_objects:
    - field: signature
      type: signature
    - field: src
      type: ip_address
analytic_story:
    - Cisco Secure Firewall Threat Defense Analytics
    - Lumma Stealer
asset_type: Network
mitre_attack_id:
    - T1041
    - T1573.002
product:
    - Splunk Enterprise
    - Splunk Cloud
    - Splunk Enterprise Security
category: network
security_domain: network
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
      test_type: unit

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.