I think the easiest and still secure way is to do it over a dll injection.
I use Netclient::ProcessMessage and Netclient::Send atm, but I should use NetClient::OneMessageReady too because some smsg opcodes won't be catched over ProcessMessage, but the most will be and the most important...
Of course you can just capture the tcp packets and decrypt them later, but for this you always need the sessionkey (easy to get). anf if one packet is fucked up or you forget to decrypt it, all future packets can't be decrypted, because the crypt stuff is out of sync then.
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