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Description

The following analytic detects CrowdStrike alerts for Medium Identity Risk Severity with a risk score of 55 or higher. These alerts indicate significant vulnerabilities in user identities, such as suspicious behavior or compromised credentials. Promptly investigating and addressing these alerts is crucial to prevent potential security breaches and ensure the integrity and protection of sensitive information and systems.

  • Type: TTP

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-07-15
  • Author: Teoderick Contreras, Splunk
  • ID: c23b425c-9024-4bd7-b526-c18a4a51d93e

Annotations

ATT&CK

ATT&CK

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


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`crowdstrike_identities` riskScoreSeverity = "MEDIUM" OR riskScore >= 0.55 AND riskScore < 0.70 
| rename riskFactors{}.severity as severity, riskFactors{}.type as risk_type, roles{}.type as role_type, accounts{}.domain as domain, accounts{}.dn as dn, accounts{}.samAccountName as user 
| stats count min(_time) as firstTime max(_time) as lastTime by  domain dn primaryDisplayName risk_type severity riskScore riskScoreSeverity user role_type 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `crowdstrike_medium_identity_risk_severity_filter`

Macros

The SPL above uses the following Macros:

:information_source: crowdstrike_medium_identity_risk_severity_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
  • riskFactors{}.severity
  • riskFactors{}.type
  • roles{}.type
  • accounts{}.domain
  • accounts{}.dn
  • accounts{}.samAccountName

How To Implement

To implement crowdstrike:identities logs, use the Falcon Streaming API. Set up an API client, authenticate with your CrowdStrike credentials, and subscribe to the "crowdstrike:identities" event stream. Process and store the 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
70.0 100 70 Medium Identity Risk Score Severity found on $domain$

: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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