alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed KrustyLoader Domain (farstream .org) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".farstream.org"; endswith; fast_pattern; reference:url,www.synacktiv.com/publications/krustyloader-rust-malware-linked-to-ivanti-connectsecure-compromises; classtype:trojan-activity; sid:2050636; rev:1; metadata:affected_product Linux, affected_product Ivanti, attack_target Networking_Equipment, created_at 2024_01_31, deployment Perimeter, malware_family KrustyLoader, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_01_31;)