Detection: Cisco Secure Firewall - Lumma Stealer Download Attempt

Updated Date: 2025-04-26 ID: 66f22f52-fbae-4be7-a263-561dacb63613 Author: Nasreddine Bencherchali, Splunk, Talos NTDR Type: Anomaly Product: Splunk Enterprise Security

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.

 1`cisco_secure_firewall` EventType=IntrusionEvent signature_id IN (62710, 62711, 62712, 62713, 62714, 62715, 62716, 62717, 64810, 64811)
 2
 3| fillnull
 4
 5| stats min(_time) as firstTime max(_time) as lastTime 
 6        by src_ip dest_ip dest_port transport signature_id signature class_desc MitreAttackGroups rule InlineResult InlineResultReason app
 7
 8| `security_content_ctime(firstTime)`
 9
10| `security_content_ctime(lastTime)`
11
12| `cisco_secure_firewall___lumma_stealer_download_attempt_filter`

Data Source

Name Platform Sourcetype Source
Cisco Secure Firewall Threat Defense Intrusion Event N/A 'cisco:sfw:estreamer' 'not_applicable'

Macros Used

Name Value
cisco_secure_firewall sourcetype="cisco:sfw:estreamer"
cisco_secure_firewall___lumma_stealer_download_attempt_filter search *
cisco_secure_firewall___lumma_stealer_download_attempt_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK
+ Kill Chain Phases
+ NIST
+ CIS
- Threat Actors
ID Technique Tactic
T1041 Exfiltration Over C2 Channel Exfiltration
T1573.002 Asymmetric Cryptography Command And Control
Actions on Objectives
Command and Control
DE.AE
CIS 13

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting Value
Disabled true
Cron Schedule 0 * * * *
Earliest Time -70m@m
Latest Time -10m@m
Schedule Window auto
Creates Risk Event True
This configuration file applies to all detections of type anomaly. These detections will use Risk Based Alerting.

Implementation

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.

Associated Analytic Story

Risk Based Analytics (RBA)

Risk Message:

Lumma Stealer Download Attempt detected on host $dest_ip$ origniating from $src_ip$

Risk Object Risk Object Type Risk Score Threat Objects
dest_ip system 25 src_ip, signature

References

Detection Testing

Test Type Status Dataset Source Sourcetype
Validation ✅ Passing N/A N/A N/A
Unit ✅ Passing Dataset not_applicable cisco:sfw:estreamer
Integration ✅ Passing Dataset not_applicable cisco:sfw:estreamer

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

Source: GitHub | Version: 1