alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MassLogger Client Data Exfil SMTP"; flow:established,to_server; content:"Subject|3a 20|MassLogger|20 7c 20|"; fast_pattern; reference:md5,862b6b45307a816ac1e3321ec66b212d; classtype:command-and-control; sid:2030809; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_07_27, deployment Perimeter, malware_family MassLogger, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_28;)