alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cryptolocker Ransom Page"; flow:established,to_server; http.uri; content:"/buy.php?user_code="; fast_pattern; content:"&user_pass="; reference:url,barracudalabs.com/2014/12/new-cryptolocker-spear-phishing-campaign-looks-to-be-the-grinch-that-stole-christmas-in-australia/; classtype:trojan-activity; sid:2019978; rev:4; metadata:created_at 2014_12_20, signature_severity Major, updated_at 2020_09_28;)