alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/Covagent Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/push?token=TPRI&msg="; fast_pattern; startswith; http.user_agent; content:"Go-http-client/"; startswith; http.header_names; content:"Version|0d 0a|"; content:!"Referer"; reference:md5,61e41ce10b04124f590524c79f8a0fe7; classtype:trojan-activity; sid:2038901; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_09_19, deployment Perimeter, former_category MALWARE, malware_family Win32_Covagent, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17, reviewed_at 2025_04_17;)