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; content:"/rat.php"; bsize:8; http.user_agent; content:"powershell"; nocase; http.header_names; content:!"Referer"; content:!"Accept"; reference:md5,4aa02a7e7e7976e1afca9469c2c54729; reference:url,blog.talosintelligence.com/attributing-yorotrooper/; classtype:trojan-activity; sid:2049809; rev:1; 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 2023_12_21; target:src_ip;)