alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Spyder Successful CnC Checkin"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; bsize:3; content:"|7b 7d|"; flowbits:isset,ET.Spyder2023.1; threshold:type limit, count 1, seconds 60, track by_src; classtype:command-and-control; sid:2049699; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_15, deployment Perimeter, malware_family Spyder, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_15, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)