alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DarkGate CnC Exfil via AutoIt Payload"; flow:established,to_server; flowbits:isset,ET.AutoItDownload; urilen:15; http.method; content:"GET"; http.uri; content:"/screenshot.png"; fast_pattern; http.user_agent; content:"WindowsPowerShell/"; 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:2052525; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_05_09, deployment Perimeter, malware_family DarkGate, confidence High, signature_severity Critical, 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;)