alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET ATTACK_RESPONSE Grizzly Loader PowerShell Script Inbound"; flow:established,to_client; http.response_body; content:"|24|ProgressPreference"; content:"|24|ErrorActionPreference"; content:"X-Panel-Internal"; fast_pattern; classtype:trojan-activity; sid:2071862; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_31, deployment Perimeter, deployment SSLDecrypt, malware_family GrizzlyLoader, confidence High, signature_severity Major, updated_at 2026_08_31, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:dest_ip;)