alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE STRRAT CnC Checkin"; flow:established,to_server; dsize:<300; content:"ping|7c|STRRAT|7c|"; depth:12; fast_pattern; content:"|7c|"; distance:0; content:"|7c|"; distance:0; content:"|7c|"; distance:0; content:"|7c|"; distance:0; content:"|7c|"; distance:0; classtype:command-and-control; sid:2030358; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_19, deployment Perimeter, malware_family STRRAT, confidence High, signature_severity Major, updated_at 2020_06_19;)