ET EXPLOIT Inbound Setup Message from SMTP Smuggling Tool

Query · suricata

flow:established,to_client;
content:"From|3a 20|setup|5f|check|40|"; nocase;
content:"To|3a 20|"; nocase; distance:0;
content:"Subject|3a 20|SETUP|20|CHECK"; nocase; distance:0;
content:"Date|3a 20|"; nocase; distance:0;
content:"Message|2d|ID|3a 20|"; nocase; distance:0;
content:"Your setup seems to be working! You can now proceed with smuggling tests!"; fast_pattern; nocase; distance:0;
Raw source ET EXPLOIT Inbound Setup Message from SMTP Smuggling Tool · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert smtp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT Inbound Setup Message from SMTP Smuggling Tool";
    flow:established,to_client;
    content:"From|3a 20|setup|5f|check|40|"; nocase;
    content:"To|3a 20|"; nocase; distance:0;
    content:"Subject|3a 20|SETUP|20|CHECK"; nocase; distance:0;
    content:"Date|3a 20|"; nocase; distance:0;
    content:"Message|2d|ID|3a 20|"; nocase; distance:0;
    content:"Your setup seems to be working! You can now proceed with smuggling tests!"; 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:2049923; rev:1;
    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_05;
)

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