alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Khaosz.A!MTB Checkin - Command Retrieval"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/command?address="; startswith; fast_pattern; pcre:"/^[A-Za-z0-9+/=]{24}$/R"; http.user_agent; content:"Go-http-client/"; startswith; http.cookie; content:"jwt="; startswith; threshold:type limit, seconds 120, count 1, track by_dst; reference:md5,94803cf635cf08b96ea3de6b301563b5; classtype:trojan-activity; sid:2042890; rev:1; metadata:affected_product Linux, attack_target Client_and_Server, created_at 2022_12_14, deployment Perimeter, malware_family Win32_Khaosz_A_MTB, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_14;)