ET EXPLOIT Inbound Smuggling Message from SMTP Smuggling Tool M1

alert smtp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Inbound Smuggling Message from SMTP Smuggling Tool M1";
    flow:established,to_client;
    content:"From|3a 20|test|40|"; nocase;
    content:"To|3a 20|"; nocase; distance:0;
    content:"Subject|3a 20|CHECK|20|EMAIL"; nocase; distance:0;
    content:"Date|3a 20|"; nocase; distance:0;
    content:"Message|2d|ID|3a 20|"; nocase; distance:0;
    content:"TESTING"; nocase; distance:0;
    content:"as|20 22|fake|22 20|end|2d|of|2d|data|20|sequence|21|"; fast_pattern; nocase; distance:0;
    reference:cve,2023-51764;
    reference:url,github.com/The-Login/SMTP-Smuggling-Tools/blob/main/smtp_smuggling_scanner.py;
    reference:cve,2023-51766;
    reference:cve,2023-51765;
    classtype:trojan-activity;
    sid:2049924; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2024_01_05, cve CVE_2023_51765, deployment Perimeter, confidence High, signature_severity Critical, tag Exploit, updated_at 2024_01_31;
)