alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE JS/GootLoader CnC Exfil"; flow:established,to_server; http.uri; bsize:11; content:"/xmlrpc.php"; fast_pattern; http.user_agent; bsize:111; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|29 20|AppleWebKit|2f|537|2e|36|20 28|KHTML|2c 20|like|20|Gecko|29 20|Chrome|2f|107|2e|0|2e|0|2e|0|20|Safari|2f|537|2e|36"; http.cookie; pcre:"/^[0-9A-Z]{10}\x3a\x20/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,esentire.com/blog/gootloader-striking-with-a-new-infection-technique; reference:url,twitter.com/GootLoaderSites/status/1594888020058337281; classtype:trojan-activity; sid:2042541; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_09, deployment Perimeter, deployment SSLDecrypt, malware_family JS_GootLoader, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30, reviewed_at 2025_10_24;)