alert http any any -> $HOME_NET any (msg:"ET EXPLOIT Apache Struts 2 REST Plugin ysoserial Usage (B64) 1"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"eXNvc2VyaWFsL"; reference:cve,2017-9805; reference:url,lgtm.com/blog/apache_struts_CVE-2017-9805_announcement; classtype:attempted-user; sid:2024668; rev:4; metadata:affected_product Apache_Struts2, attack_target Web_Server, created_at 2017_09_07, cve CVE_2017_9805, deployment Datacenter, signature_severity Critical, tag possible_exploitation, tag CISA_KEV, updated_at 2024_03_07;)