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Description

The following analytic detects CrowdStrike alerts for privilege escalation attempts by non-admin users. These alerts indicate unauthorized efforts by regular users to gain elevated permissions, posing a significant security risk. Detecting and addressing these attempts promptly helps prevent potential breaches and ensures that user privileges remain properly managed, maintaining the integrity of the organization's security protocols.

  • Type: Anomaly
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2024-07-15
  • Author: Teoderick Contreras, Splunk
  • ID: 69e2860c-0e4b-40ae-9dc4-bf9e3bf2a548

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1110 Brute Force Credential Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.AE
CIS20
  • CIS 10
CVE 


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`crowdstrike_stream` tag=alert 
| rename event.EndpointIp as src_ip, event.EndpointName as src_host, event.UserName as user, event.IncidentDescription as description, event.IncidentType as type, event.NumbersOfAlerts as count_alerts, event.SeverityName as severity 
| stats count min(_time) as firstTime max(_time) as lastTime by src_ip, src_host, user, description, type, count_alerts, severity 
| where LIKE(type,"%Privilege escalation%") AND NOT LIKE(user, "%adm%") AND NOT LIKE(user, "%svc%") AND NOT LIKE(user, "%admin%") 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `crowdstrike_privilege_escalation_for_non_admin_user_filter`

Macros

The SPL above uses the following Macros:

:information_source: crowdstrike_privilege_escalation_for_non-admin_user_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • event.EndpointIp
  • event.EndpointName
  • event.UserName
  • event.IncidentDescription
  • event.IncidentType
  • event.NumbersOfAlerts
  • event.SeverityName

How To Implement

To implement CrowdStrike stream JSON logs, use the Falcon Streaming API. Set up an API client, authenticate with your CrowdStrike credentials, and subscribe to the "CrowdStrike:Event:Streams:JSON" event stream. Process and store the JSON logs as needed, integrating them into your logging or SIEM system for monitoring and analysis.

Known False Positives

unknown

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
49.0 70 70 A Privilege escalation happened in Non-Admin Account in $src_host$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

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

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