alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE FRAMEREST Web Shell Activity Observed"; flow:established,to_server; http.method; content:"POST"; http.cookie; content:"DSID|3d|"; fast_pattern; pcre:"/^[-A-Za-z0-9+/=]{65,}/R"; bsize:>69; reference:url,www.mandiant.com/resources/blog/investigating-ivanti-zero-day-exploitation; classtype:trojan-activity; sid:2050651; rev:1; metadata:affected_product Ivanti, attack_target Networking_Equipment, created_at 2024_01_31, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2024_01_31, reviewed_at 2025_07_14; target:dest_ip;)