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MediumMicrosoft Sentinel analytics

New Agent Added to Pool by New User or Added to a New OS Type

As seen in attacks such as SolarWinds attackers can look to subvert a build process by controlling build servers. Azure DevOps uses agent pools to execute pipeline tasks. An attacker could insert compromised agents…

Description

As seen in attacks such as SolarWinds attackers can look to subvert a build process by controlling build servers. Azure DevOps uses agent pools to execute pipeline tasks. An attacker could insert compromised agents that they control into the pools in order to execute malicious code. This query looks for users adding agents to pools they have not added agents to before, or adding agents to a pool of an OS that has not been added to that pool before. This detection has potential for false positives so has a configurable allow list to allow for certain users to be excluded from the logic.

Detection logic

Detection requirements

Platform
ContainersESXiLinuxmacOSNetwork DevicesWindows

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

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