alert tcp $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE [PTsecurity] Malicious SSL connection (Upatre Downloader CnC) 0"; flow:established,to_server; content:"|17 03|"; depth:2; content:"|00 a0|"; distance:1; within:2; fast_pattern; stream_size:server,>,4868; stream_size:server,<,5949; stream_size:client,>,424; stream_size:client,<,685; flowbits:isset,FB346039_0; flowbits:unset,FB346039_0; flowbits:set,FB346039_1; flowbits:noalert; classtype:command-and-control; sid:2024773; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_09_27, deployment Perimeter, deprecation_reason False_Positive, malware_family Upatre, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2019_07_26;)