Detection: Cisco Secure Firewall - Lumma Stealer Activity

Updated Date: 2026-05-13 ID: 96bce783-c22e-4e48-8cf1-3eb2794c5083 Author: Nasreddine Bencherchali, Splunk, Talos NTDR Type: TTP Product: Splunk Enterprise Security

Description

This analytic detects Lumma Stealer activity using Cisco Secure Firewall Intrusion Events. It leverages Cisco Secure Firewall Threat Defense IntrusionEvent logs to identify cases where four of the following Snort signature IDs 64793, 64794, 64797, 64798, 64799, 64800, 64801, 62709, 64167, 64168, 64169, 64796, 62710, 62711, 62712, 62713, 62714, 62715, 62716, 62717, 64812, 64810, 64811 occurs in the span of 15 minutes from the same host. If confirmed malicious, this behavior is highly indicative of a successful infection of Lumma Stealer.

Search

 1`cisco_secure_firewall` EventType=IntrusionEvent signature_id IN (64793, 64794, 64797, 64798, 64799, 64800, 64801, 62709, 64167, 64168, 64169, 64796, 62710, 62711, 62712, 62713, 62714, 62715, 62716, 62717, 64812, 64810, 64811)
 2
 3| bin _time span=15m
 4
 5| fillnull
 6
 7| stats dc(signature_id) as unique_signature_count
 8        values(signature_id) as signature_id
 9        values(signature) as signature
10        values(class_desc) as class_desc
11        values(MitreAttackGroups) as MitreAttackGroups
12        values(InlineResult) as InlineResult
13        values(InlineResultReason) as InlineResultReason
14        values(dest) as dest
15        values(dest_port) as dest_port
16        values(rule) as rule
17        values(transport) as transport
18        values(app) as app
19        min(_time) as firstTime
20        max(_time) as lastTime
21        by src
22
23| where unique_signature_count >= 3
24
25| `security_content_ctime(firstTime)`
26
27| `security_content_ctime(lastTime)`
28
29| `cisco_secure_firewall___lumma_stealer_activity_filter`

Data Source

Name	Platform	Sourcetype	Source
Cisco Secure Firewall Threat Defense Intrusion Event	Other	`'cisco:sfw:estreamer'`	`'not_applicable'`

Macros Used

Name	Value
security_content_ctime	`convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)`
cisco_secure_firewall___lumma_stealer_activity_filter	`search *`

cisco_secure_firewall___lumma_stealer_activity_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
T1027	Obfuscated Files or Information	Stealth
T1190	Exploit Public-Facing Application	Initial Access
T1204	User Execution	Execution
T1210	Exploitation of Remote Services	Lateral Movement

Delivery

Exploitation

Installation

DE.CM

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 Finding (Notable)	Yes
Rule Title	`%name%`
Rule Description	`%description%`
Notable Event Fields	user, dest
Creates Intermediate Finding (Risk Event)	No

TTP detections generate a Finding (Notable) and may generate Intermediate Findings (Risk Events) for associated entities.

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 very unlikely.

Associated Analytic Story

Finding

Title	Entity Field	Entity Type	Risk Score
Lumma Stealer Activity on host $dest$ origniating from $src$	dest	system	50

Threat Objects

Field	Type
signature	signature
src	ip_address

References

https://malpedia.caad.fkie.fraunhofer.de/details/win.lumma

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: 7