alert tcp $EXTERNAL_NET 8074 -> $HOME_NET any (msg:"ET CHAT GaduGadu Chat Server Welcome Packet"; flow:established,from_server; dsize:12; content:"|01 00 00 00|"; depth:4; flowbits:set,ET.gadu.welcome; reference:url,piotr.trzcionkowski.pl/default.asp?load=/programy/pppgg_protokol.html; classtype:policy-violation; sid:2008297; rev:5; metadata:created_at 2010_07_30, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)