alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE WaterDropX PRISM CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".x?v="; content:"&act="; http.user_agent; content:"agent-waterdropx"; fast_pattern; flowbits:set,ET.waterdropx; classtype:command-and-control; sid:2033270; rev:2; metadata:created_at 2021_07_07, malware_family PRISM, confidence High, signature_severity Major, tag WaterDropX, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_07;)