Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Locky CnC Checkin"; flow:to_server,established; urilen:14; http.method; content:"POST"; http.uri; content:"/imageload.cgi"; fast_pattern; http.header; content:"x-requested-with|3a 20|XMLHttpRequest|0d 0a|"; content:"www-form-urlencoded|0d 0a|"; http.request_body; pcre:"/^[A-Za-z]{1,10}=[^&]+(?:&[A-Za-z]{1,10}=[^&]+){10,}$/s"; reference:md5,40ebefdec6870263827ce6425702e785; classtype:command-and-control; sid:2026517; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_17, deployment Perimeter, confidence High, signature_severity Major, tag Locky, updated_at 2020_11_04;)