alert tls $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE OilRig QUADAGENT CnC Domain in SNI"; flow:to_server,established; tls.sni; content:"www.cpuproc.com"; endswith; reference:md5,d51c2ffce844d42bab2f2c3131e3dbd4; reference:url,researchcenter.paloaltonetworks.com/2018/07/unit42-oilrig-targets-technology-service-provider-government-agency-quadagent/; classtype:command-and-control; sid:2025891; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_07_25, deployment Perimeter, malware_family QuadAgent, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16;)