alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Powershell commands sent B64 3"; flow:established,from_server; content:"TAHQAYQByAHQALQBQAHIAbwBjAGUAcwBz"; fast_pattern; classtype:trojan-activity; sid:2025012; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_11_16, deployment Perimeter, confidence High, signature_severity Major, updated_at 2019_10_08;)