alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lyceum Golang HTTP Backdoor CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.user_agent; content:"Go-http-client/"; http.header; content:"auth_token=|22|XXXXXXX|22|"; fast_pattern; http.request_body; content:"details="; content:"&news="; reference:url,research.checkpoint.com/2022/state-sponsored-attack-groups-capitalise-on-russia-ukraine-war-for-cyber-espionage/; classtype:trojan-activity; sid:2035958; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_14, deployment Perimeter, confidence High, signature_severity Major, tag Backdoor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_14;)