alert smtp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT Exim Internet Mailer Remote Code Execution"; flow:established,to_server; content:"JHtydW57L2Jpbi9iYXNoIC1jICIvYmluL2Jhc2ggLWkgPiYgL2Rldi90Y3Av"; reference:cve,2018-6789; reference:url,exploit-db.com/exploits/44571/; classtype:attempted-user; sid:2025793; rev:2; metadata:attack_target SMTP_Server, created_at 2018_07_09, cve CVE_2018_6789, deployment Datacenter, performance_impact Low, confidence High, signature_severity Major, updated_at 2019_07_26, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)