ET ATTACK_RESPONSE Obfuscated PowerShell Payload Inbound

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET ATTACK_RESPONSE Obfuscated PowerShell Payload Inbound";
    flow:established,to_client;
    http.response_body;
    content:"|20 3d 20 5b|char|5d 28|";
    pcre:"/\x28(?:\d{1,5})\x20\x2dbxor\x20(?:\d{1,5})\x29/";
    content:"|29 2a 28|";
    content:"|29 2f 28|";
    content:"|5b|char|5d 28 5b|uint16|5d 28|"; fast_pattern;
    content:"|5b|int|5d|";
    content:"|5b|Byte|5b 5d 5d|";
    reference:url,community.emergingthreats.net/t/powershell-malware-from-147-45-178-149/3139;
    reference:md5,30f804ba5e2bd520b2a80dcdded7031d;
    classtype:trojan-activity;
    sid:2066382; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_12_18, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_12_18, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer;
    target:dest_ip;
)