alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PS1/Unknown Payload C2 Downloader (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"|2f 3f|status|3d|"; startswith; fast_pattern; content:"&av="; content:"&domain="; content:"&os="; http.user_agent; content:"WindowsPowerShell"; reference:md5,3061050ea5532508e71b7ab663549ff4; classtype:trojan-activity; sid:2049428; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_01, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_04;)