alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET EXPLOIT Likely Struts S2-053-CVE-2017-12611 Exploit Attempt M1"; flow:established,to_server; http.uri; content:"="; content:"%"; distance:0; content:"{"; distance:0; content:"ProcessBuilder"; nocase; distance:0; fast_pattern; content:"java"; nocase; content:"lang"; nocase; pcre:"/=\s*\x25\s*\{\s*.+?\bProcessBuilder\b/i"; classtype:attempted-admin; sid:2024814; rev:3; metadata:affected_product Apache_Struts2, attack_target Web_Server, created_at 2017_10_06, cve CVE_2017_12611, deployment Datacenter, confidence Medium, signature_severity Major, updated_at 2020_08_20;)