ET EXPLOIT Possible Barracuda Email Security Gateway Remote Code Execution Attempt (CVE-2023-2868) M1

alert smtp any any -> $SMTP_SERVERS any (
    msg:"ET EXPLOIT Possible Barracuda Email Security Gateway Remote Code Execution Attempt (CVE-2023-2868) M1";
    flow:established,to_server;
    file.data;
    content:"|75 73 74 61 72|"; fast_pattern;
    content:"|27 60|"; distance:0;
    content:"|60 27|"; within:500;
    reference:url,www.mandiant.com/resources/blog/barracuda-esg-exploited-globally;
    reference:cve,2023-2868;
    classtype:attempted-admin;
    sid:2046280; rev:1;
    metadata:affected_product Barracuda_ESG, attack_target SMTP_Server, created_at 2023_06_15, cve CVE_2023_2868, deployment Perimeter, deployment Internal, performance_impact Low, confidence Low, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_21, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)