alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE x0Proto Init"; flow:established,to_client; flowbits:set,et.x0proto; flowbits:noalert; dsize:2; content:"x0"; depth:2; classtype:trojan-activity; sid:2012236; rev:4; metadata:created_at 2011_01_27, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)