alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE YoroTrooper APT Related Activty (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:8; content:"/rat.php"; fast_pattern; http.user_agent; content:"powershell"; nocase; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|accept"; reference:md5,4aa02a7e7e7976e1afca9469c2c54729; reference:url,blog.talosintelligence.com/attributing-yorotrooper/; classtype:trojan-activity; sid:2049809; rev:3; metadata:attack_target Client_Endpoint, created_at 2023_12_21, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30; target:src_ip;)