alert http any any -> $HOME_NET any (msg:"ET EXPLOIT Apache Struts 2 REST Plugin XStream RCE (ProcessBuilder)"; flow:to_server,established; http.request_body; content:"java.lang.ProcessBuilder"; nocase; fast_pattern; content:"<command"; nocase; distance:0; pcre:"/^[\s>]/Rs"; reference:cve,2017-9805; reference:url,lgtm.com/blog/apache_struts_CVE-2017-9805_announcement; classtype:attempted-user; sid:2024663; rev:2; metadata:affected_product Apache_Struts2, attack_target Web_Server, created_at 2017_09_06, cve CVE_2017_9805, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Critical, tag CISA_KEV, updated_at 2020_08_12;)