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InformationalSplunk security contentNasreddine Bencherchali +2

Windows New Deny Permission Set On Service SD Via Sc.EXE

The following analytic detects changes in a service security descriptor where a new deny ace has been added. It leverages data from Endpoint Detection and Response (EDR) agents, specifically searching for any process…

Description

The following analytic detects changes in a service security descriptor where a new deny ace has been added. It leverages data from Endpoint Detection and Response (EDR) agents, specifically searching for any process execution involving the "sc.exe" binary with the "sdset" flag targeting any service and adding a dedicated deny ace to specific groups. If confirmed malicious, this could allow an attacker to escalate their privileges, blind defenses and more. Investigate appropariate services and groups to determine if the behavior is malicious.

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSOffice SuiteWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
crowdstrike_processrollup2sysmon_eventid_1windows_event_log_security_4688

Known benign triggers

  • - McAfee related services changes are a known false positive. The sc.exe utility is used to deny groups such as Authenticated Users, Built-in Administrators and System access to certain permissions.

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