alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/SystemBC CnC Checkin"; flow:established,to_server; dsize:100; content:"ordata|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; offset:1; depth:47; reference:md5,b8fb4ba9ef16fcaa442c2857bb045640; classtype:command-and-control; sid:2031599; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_03, deployment Perimeter, malware_family SystemBC, confidence High, signature_severity Major, updated_at 2021_02_02;)