alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Agent.BIC Variant CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?response="; content:"&cpu="; distance:0; content:"&gpu="; distance:0; content:"&ram="; distance:0; content:"&name="; distance:0; content:"&os="; distance:0; http.header_names; content:!"Referer"; content:!"User-Agent"; content:!"Accept"; content:!"Cache"; reference:md5,C6C781F0ED065476A4297C2AC96A6D83; classtype:command-and-control; sid:2025359; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_02_15, deployment Perimeter, malware_family Agent_BIC, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_24;)