alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Spy.Mekotio.ER Checkin"; flow:established,to_server; content:"|56 50 55 4a 56 52 40|"; startswith; fast_pattern; content:"|7c 78 78 78 7c 7c|"; distance:0; content:"|7c 79 79 79 7c|"; distance:0; reference:md5,5d9580fe41fbcf5dfe08d4a61df5014e; classtype:trojan-activity; sid:2044941; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_04_13, deployment Perimeter, malware_family Win32_Spy_Mekotio_ER, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_27, reviewed_at 2024_01_31;)