alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Enigma Locker Checkin"; flow:established,to_server; urilen:8; http.method; content:"GET"; http.uri; content:"/get.php"; fast_pattern; http.host; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/"; http.connection; content:"close"; http.header_names; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|User-Agent|0d 0a|"; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; startswith; reference:md5,229b639878c9e932ef8028d2875526b9; reference:md5,b4c5edd3ba110e0fdb420277f24bd0b0; reference:url,www.bleepingcomputer.com/news/security/the-enigma-ransomware-targets-russian-speaking-users/; classtype:command-and-control; sid:2023334; rev:7; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_12, deployment Perimeter, malware_family Ransomware, malware_family Enigma, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_04_06;)