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;
)