alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CozyCar CnC Beacon"; flow:established,to_server; http.uri; content:"=11&"; content:"=2"; distance:1; within:8; content:"&"; distance:6; within:7; content:"=410&"; distance:1; within:11; content:"=650&"; distance:1; within:11; fast_pattern; content:"=51"; distance:1; within:9; pcre:"/=11&[^&]{1,7}?=2[^&]{6,12}&[^&]{1,7}?=410&[^&]{1,7}?=650&[^&]{1,7}?=51$/"; reference:url,www.us-cert.gov/security-publications/GRIZZLY-STEPPE-Russian-Malicious-Cyber-Activity; classtype:command-and-control; sid:2023965; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_02_17, deployment Perimeter, malware_family APT29_CozyCar, confidence High, signature_severity Major, tag c2, updated_at 2020_08_04, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)