It also works in HL1, check the orangebox version. It
should (if you are being attacked please test it) prevent your server from crashing, because of the way it generates and sends the A2S_INFO packet.
If this works, the next step is to find out why was this botnet created, which may not be easy. My servers aren't in the attackers list, so I can't make tests.
Anyway, if your server is a victim of these attacks, please test the module (ob version).
https://forums.alliedmods.net/showthread.php?t=135543
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