alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE WaterDropX PRISM CnC Response"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"@@"; fast_pattern; offset:1; content:"@@"; distance:1; within:2; content:"@@"; distance:0; within:50; isdataat:!6,relative; flowbits:isset,ET.waterdropx; classtype:command-and-control; sid:2033271; 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;)