alert smtp $EXTERNAL_NET any -> $SMTP_SERVERS any (msg:"ET EXPLOIT Ghostscript invalidcheck escape attempt (SMTP)"; flow:to_server,established; file_data; content:"legal"; content:"restore"; distance:0; content:"currentdevice"; content:"putdeviceprops"; pcre:"/legal[^x7B]*\x7B[^\x7D]*restore/smi"; reference:url,seclists.org/oss-sec/2018/q3/142; classtype:attempted-user; sid:2026084; rev:2; metadata:attack_target SMTP_Server, created_at 2018_09_05, deployment Datacenter, signature_severity Major, updated_at 2019_07_26;)