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Suspicious SeIncreaseBasePriorityPrivilege Use

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Suspicious SeIncreaseBasePriorityPrivilege Use

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Identifies attempts to use the SeIncreaseBasePriorityPrivilege privilege by an unusual process. This could be related to hijack execution flow of a process via threats priority manipulation.

Rule type: query

Rule indices:

  • logs-system.security*
  • logs-windows.forwarded*
  • winlogbeat-*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Privilege Escalation
  • Data Source: Windows Security Event Logs
  • Resources: Investigation Guide

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Triage and analysis

Investigating Suspicious SeIncreaseBasePriorityPrivilege Use

SeIncreaseBasePriorityPrivilege allows to increase the priority of processes running on the system so that the CPU scheduler allows them to pre-empt other lower priority processes when the higher priority process has something to do.

Possible investigation steps

  • Review the process.executable reputation and it’s execution chain.
  • Investiguate if the SubjectUserName is expected to perform this action.
  • Correlate the event with other security alerts or logs to identify any patterns or additional suspicious activities that might suggest a broader attack campaign.
  • Check the agent health status and verify if there is any tampering with endpoint security processes.

False positive analysis

  • Administrative tasks involving legitimate CPU scheduling priority changes.

Response and remediation

  • Immediately isolate the affected machine from the network to prevent further unauthorized access or lateral movement within the domain.
  • Terminate the processes involved in the execution chain.
  • Escalate the incident to the security operations center (SOC) or incident response team for further investigation and to ensure comprehensive remediation efforts are undertaken.

Setup

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Setup

Ensure advanced audit policies for Windows are enabled, specifically: Audit Sensitive Privilege Use Event ID 4674 (An operation was attempted on a privileged object.)

Computer Configuration >
Policies >
Windows Settings >
Security Settings >
Advanced Audit Policies Configuration >
Audit Policies >
Privilege Use >
Audit Sensitive Privilege Use (Success)

Rule query

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event.category:iam and event.code:"4674" and
winlog.event_data.PrivilegeList:"SeIncreaseBasePriorityPrivilege" and event.outcome:"success" and
winlog.event_data.AccessMask:"512" and not winlog.event_data.SubjectUserSid:("S-1-5-18" or "S-1-5-19" or "S-1-5-20")

Framework: MITRE ATT&CKTM

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