alert smtp any any -> $SMTP_SERVERS any (msg:"ET EXPLOIT Possible Barracuda Email Security Gateway Remote Code Execution Attempt (CVE-2023-2868) M2"; flow:established,to_server; file.data; content:"|60 27|"; content:"|75 73 74 61 72|"; distance:0; fast_pattern; content:"|27 60|"; distance:0; within:500; reference:url,www.mandiant.com/resources/blog/barracuda-esg-exploited-globally; reference:cve,2023-2868; classtype:attempted-admin; sid:2048146; rev:2; metadata:affected_product Barracuda_ESG, attack_target SMTP_Server, created_at 2023_09_21, cve CVE_2023_2868, deployment Perimeter, deployment Internal, performance_impact Low, confidence Low, signature_severity Major, tag CISA_KEV, updated_at 2023_09_29, reviewed_at 2024_10_02, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)