alert dns $HOME_NET any -> any any (msg:"ET MALWARE Cryptolocker .onion Proxy Domain"; dns_query; content:"r2bv3u64ytfi2ssf"; depth:16; fast_pattern; nocase; 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:2019979; rev:4; metadata:created_at 2014_12_20, confidence High, signature_severity Major, updated_at 2019_08_30;)