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net_localgroup_discovery.yml
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net_localgroup_discovery.yml
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name: Net Localgroup Discovery
id: 54f5201e-155b-11ec-a6e2-acde48001122
version: 2
date: '2024-05-21'
author: Michael Haag, Splunk
status: production
type: Hunting
description: The following analytic detects the execution of the `net localgroup`
command, which is used to enumerate local group memberships on a system. It leverages
data from Endpoint Detection and Response (EDR) agents, focusing on process execution
logs that include command-line details. This activity is significant because it
can indicate an attacker is gathering information about local group memberships,
potentially to identify privileged accounts. If confirmed malicious, this behavior
could lead to further privilege escalation or lateral movement within the network.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime from datamodel=Endpoint.Processes where Processes.process_name=net.exe
OR Processes.process_name=net1.exe (Processes.process="*localgroup*") by Processes.dest
Processes.user Processes.parent_process_name Processes.process_name Processes.process
Processes.original_file_name Processes.process_id Processes.parent_process_id |
`drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`
| `net_localgroup_discovery_filter`'
how_to_implement: The detection is based on data that originates from Endpoint Detection
and Response (EDR) agents. These agents are designed to provide security-related
telemetry from the endpoints where the agent is installed. To implement this search,
you must ingest logs that contain the process GUID, process name, and parent process.
Additionally, you must ingest complete command-line executions. These logs must
be processed using the appropriate Splunk Technology Add-ons that are specific to
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
data model. Use the Splunk Common Information Model (CIM) to normalize the field
names and speed up the data modeling process.
known_false_positives: False positives may be present. Tune as needed.
references:
- https://attack.mitre.org/techniques/T1069/001/
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1069.001/T1069.001.md
- https://media.defense.gov/2023/May/24/2003229517/-1/-1/0/CSA_Living_off_the_Land.PDF
- https://thedfirreport.com/2023/05/22/icedid-macro-ends-in-nokoyawa-ransomware/
tags:
analytic_story:
- Prestige Ransomware
- Volt Typhoon
- Graceful Wipe Out Attack
- IcedID
- Windows Discovery Techniques
- Windows Post-Exploitation
- Azorult
- Active Directory Discovery
- Rhysida Ransomware
asset_type: Endpoint
confidence: 50
impact: 30
message: Local group discovery on $dest$ by $user$.
mitre_attack_id:
- T1069
- T1069.001
observable:
- name: dest
type: Endpoint
role:
- Victim
- name: user
type: User
role:
- Victim
product:
- Splunk Enterprise
- Splunk Enterprise Security
- Splunk Cloud
required_fields:
- _time
- Processes.dest
- Processes.user
- Processes.parent_process_name
- Processes.parent_process
- Processes.original_file_name
- Processes.process_name
- Processes.process
- Processes.process_id
- Processes.parent_process_path
- Processes.process_path
- Processes.parent_process_id
risk_score: 15
security_domain: endpoint
tests:
- name: True Positive Test
attack_data:
- data:
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1069.001/atomic_red_team/windows-sysmon.log
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
sourcetype: xmlwineventlog