alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Win32/KLBanker CnC Response"; flow:established,to_client; http.response_body; content:"|3c|strong|3e|Browser|3a 20 3c 2f|strong|3e|"; startswith; content:"|3c|br|20 2f 3e 3c|strong|3e|Operating|20|System|3a 20 3c 2f|strong|3e|"; fast_pattern; reference:url,twitter.com/StopMalvertisin/status/1653317890131763201; classtype:trojan-activity; sid:2045293; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_02, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_02;)