alert tcp $HOME_NET any <> $EXTERNAL_NET any (msg:"ET CHAT Yahoo IM file transfer request"; flow:established; content:"YMSG"; nocase; depth:4; content:"|00 dc|"; offset:10; depth:2; classtype:policy-violation; sid:2001259; rev:8; metadata:created_at 2010_07_30, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_17;)