alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gasket CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:11; content:"/cert/trust"; fast_pattern; http.user_agent; content:"Go-http-client"; startswith; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\:\d{1,5})?$/"; http.request_body; pcre:"/^[\x20-\x7e\r\n]{0,13}[^\x20-\x7e\r\n]/si"; reference:url,unit42.paloaltonetworks.com/gasket-and-magicsocks-tools-install-mespinoza-ransomware/; classtype:command-and-control; sid:2033339; rev:3; metadata:attack_target Client_Endpoint, created_at 2021_07_15, deployment Perimeter, malware_family Gasket, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_04;)