alert dns $HOME_NET any -> any any (msg:"ET MALWARE ABUSE.CH Locky Domain"; dns.query; content:"ycvcjbhgkmsiyhdd"; depth:16; fast_pattern; nocase; reference:url,ransomwaretracker.abuse.ch; classtype:trojan-activity; sid:2022778; rev:4; metadata:created_at 2016_05_03, confidence High, signature_severity Major, updated_at 2020_09_01;)