alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gh0st RAT Backdoor Checkin"; flow:established,to_server; byte_jump:4,0,little,from_beginning, post_offset -1; isdataat:!2,relative; content:"GET /?ocid="; offset:4; depth:11; reference:md5,1a5efd98ee8f8c69f2167ba91095835c; classtype:command-and-control; sid:2036861; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2019_07_26;)