alert smtp $EXTERNAL_NET any -> $SMTP_SERVERS any (msg:"ET EXPLOIT Ghostscript illegal delete bindnow attempt (SMTP)"; flow:to_server,established; file_data; content:"unlink("; fast_pattern; content:"|2E|bindnow"; content:"stopped"; distance:0; pcre:"/\x2Ebindnow[^\x7D]*\x7D\s*stopped/smi"; reference:url,seclists.org/oss-sec/2018/q3/142; classtype:attempted-user; sid:2026088; rev:2; metadata:attack_target SMTP_Server, created_at 2018_09_05, deployment Datacenter, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)