alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE LIGHTWIRE Web Shell Activity Observed"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/dana-na/auth/url_default/compcheckresult.cgi?comp=comp&compid|3d|"; fast_pattern; startswith; reference:url,www.mandiant.com/resources/blog/investigating-ivanti-zero-day-exploitation; classtype:trojan-activity; sid:2050649; rev:1; metadata:affected_product Ivanti, attack_target Networking_Equipment, created_at 2024_01_31, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_01_31; target:dest_ip;)