alert tcp $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET MALWARE Possible Upatre SSL Cert 999servers.com"; flow:established,to_client; content:"|55 04 03|"; content:"|10|*.999servers.com"; distance:1; within:17; reference:md5,b9ffad739bb47a0e4619b76af51d9a74; classtype:trojan-activity; sid:2018647; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2014_07_07, deployment Perimeter, malware_family Upatre, confidence Medium, signature_severity Critical, tag SSL_Malicious_Cert, tag Exploit_Kit, tag Downloader, tag Upatre, updated_at 2019_07_26;)