alert http $HOME_NET any -> $EXTERNAL_NET 5000 (msg:"ET MALWARE Win32/Agent.TWI CnC Checkin"; flow:established,to_server; http.request_line; content:"GET|20|/msg?msg="; startswith; fast_pattern; content:"&token="; distance:0; http.referer; content:":5000/msg?msg="; content:"&token="; distance:0; reference:md5,a487ab85983baa856fb089d9d01993fc; classtype:command-and-control; sid:2037898; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_02, deployment Perimeter, malware_family Win32_Agent_TWI, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_02;)