alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DuckTail APT CnC Activity (GET)"; flow:established,to_server; urilen:49; http.method; content:"GET"; http.uri; content:"/api/filedata/ps/"; startswith; nocase; fast_pattern; pcre:"/^([a-z0-9]{32})$/Ri"; http.user_agent; content:"WindowsPowerShell/"; reference:md5,3ab0d663608d0fded925fd01c44e7c63; reference:url,twitter.com/suyog41/status/1762742010900021572; classtype:trojan-activity; sid:2051140; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_02_28, deployment Perimeter, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_29;)