alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/FlyStudio.OJJ CnC Checkin"; flow:established,to_server; content:"|60 55 4a 3f 34|"; fast_pattern; startswith; content:"|19 24 2f|"; endswith; threshold:type limit, track by_src, seconds 120, count 1; reference:md5,0a55110b8a5b786a618bed6d76c4fa7f; classtype:trojan-activity; sid:2039681; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_11_03, deployment Perimeter, malware_family Win32_FlyStudio_OJJ, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_03;)