alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE FlawedGrace CnC Activity"; flow:to_server,established; dsize:14; content:"|47 43 52 47|"; offset:4; depth:4; threshold:type both, track by_src, count 10, seconds 60; reference:md5,2b1215fb65d33fc6206ab227a3b7e75a; classtype:command-and-control; sid:2026773; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_11_01, deployment Perimeter, confidence High, signature_severity Major, updated_at 2022_03_22;)