alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Agent Tesla Keylogger Report SMTP"; flow:established,to_server; content:"From|3a|"; nocase; content:"Subject|3a| "; nocase; content:"|5b|Agent Tesla"; fast_pattern; nocase; classtype:trojan-activity; sid:2022006; rev:3; metadata:created_at 2015_10_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)