alert tcp-pkt $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET MALWARE MSIL/Crimson Rat CnC Server Response"; flow:established,to_client; content:"|00 00 00|ent2rmezi="; offset:2; depth:13; fast_pattern; threshold:type limit, track by_src, count 5, seconds 600; reference:md5,3829791a486b0b9ccb80ffcb7177c19c; reference:url,twitter.com/0xrb/status/1515979150515122178; classtype:command-and-control; sid:2036242; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_18, deployment Perimeter, malware_family Crimson, confidence High, signature_severity Major, tag c2, updated_at 2022_04_18, reviewed_at 2023_10_04;)