alert udp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO AmanVPN Heartbeat"; dsize:45; content:"1|7c|"; startswith; pcre:"/^[a-f0-9]{32}/R"; content:"|7c|heart beat"; fast_pattern; endswith; threshold:type limit, count 1, seconds 600, track by_src; reference:md5,185a0a1a16f93c8e43cdb2955d4c64c4; classtype:misc-activity; sid:2036977; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_13, deployment Perimeter, malware_family AmanVPN, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_09;)