GAME: Source Engine Query
This signature detects a Source Engine Query. Source is a first-person shooter (FPS) engine by Valve, Inc. and is used in a variety of games, including Counter-Strike Source, Half-Life 2, Team Fortress 2, and others. This can be a violation of your organization's acceptable use policy. A query is sent before connecting to a server to play. Blocking this query prevents the user from playing on the server.
References
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3