alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE MSIL/Crimson Rat CnC Exfil"; flow:established,to_server; content:"|00 00 00|ent4rme"; offset:2; depth:10; fast_pattern; content:"|20 7c 20|"; distance:0; content:"|23|runtimebroker"; distance:0; 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:2036241; 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, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)