alert tcp $EXTERNAL_NET 6112 -> $HOME_NET any (msg:"ET GAMES Battle.net old game version"; flow:established,from_server; content:"|FF 51|"; depth:2; content:"|00 01 00 00|"; offset:4; depth:4; classtype:policy-violation; sid:2002109; rev:6; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2019_07_26;)