Adversaries may execute a binary, command, or script via a method that interacts with Windows services, such as the Service Control Manager. This can be done by either creating a new service or modifying an existing service. This technique is the execution used in conjunction with New Service and Modify Existing Service during service persistence or privilege escalation.
|Privileged Account Management||
Ensure that permissions disallow services that run at a higher permissions level from being created or interacted with by a user with a lower permission level.
|Restrict File and Directory Permissions||
Also ensure that high permission level service binaries cannot be replaced or modified by users with a lower permission level.
Changes to service Registry entries and command-line invocation of tools capable of modifying services that do not correlate with known software, patch cycles, etc., may be suspicious. If a service is used only to execute a binary or script and not to persist, then it will likely be changed back to its original form shortly after the service is restarted so the service is not left broken, as is the case with the common administrator tool PsExec.
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