alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE AutoIt3 Script Downloaded via Powershell Shortly After AutoIt3.exe Download"; flow:established,to_server; flowbits:isset,ET.AutoItDownload; http.method; content:"GET"; http.uri; content:".au3"; endswith; http.user_agent; content:"WindowsPowerShell/"; fast_pattern; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; nocase; threshold:type limit, count 1, seconds 300, track by_src; reference:md5,0286120018b92f5827ff9ad84696e7b3; classtype:misc-activity; sid:2052524; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_05_09, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2024_05_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)