alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Generic PowerShell Loader Inbound"; flow:established,to_client; http.response_body; content:"|2e|Invoke|28 5b|AppDomain|5d 3a 3a 28 27|C"; content:"|3d 27 2c 27 27 2c 27 27 2c 27 27 29|"; fast_pattern; content:"|5b|Array|5d 3a 3a|Reverse|28 24|"; content:"catch|7b 7d|"; isdataat:!5,relative; reference:md5,864000c1d4ad255fb35fe72d7f44b582; classtype:trojan-activity; sid:2072295; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_09_29, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, updated_at 2026_09_29, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:src_ip;)