alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT Related CR4T Dropper Activity M1 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".dll.xml"; endswith; fast_pattern; http.user_agent; pcre:"/^[0-9a-f]{8}-(?:([0-9a-f]{4})\-){3}[0-9a-f]{12}$/"; reference:url,securelist.com/dunequixote/112425/; reference:md5,5a04d9067b8cb6bcb916b59dcf53bed3; classtype:trojan-activity; sid:2052236; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_04_23, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_23; target:src_ip;)