alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Pure Logs Stealer/Fenix Botnet CnC Activity (GET) M3"; flow:established,to_server; urilen:<24; http.method; content:"GET"; http.uri; content:"/update_panel/"; startswith; content:".txt"; endswith; pcre:"/^(?:reg|kill|other)\x2etxt$/R"; http.user_agent; content:"WindowsPowerShell/"; fast_pattern; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,0fa0287db10babb0893ed0573fc34f82; classtype:trojan-activity; sid:2051706; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_03_20, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag c2, updated_at 2024_03_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)