alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET MALWARE Socks666 Checkin Packet"; flow:established,to_server; flowbits:set,BS.BPcheckin1; flowbits:noalert; dsize:30; content:"|9a 02 01 00|"; offset:0; depth:4; classtype:command-and-control; sid:2006398; rev:7; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)