alert dns $HOME_NET any -> any any (msg:"ET MALWARE Cryptbot CnC DGA Domain (sevt17)"; dns.query; bsize:14; content:"sevt17"; fast_pattern; content:".top"; nocase; endswith; pcre:"/^(?:[a-z]{2})sevt17(?:[a-z]{2})\x2etop$/"; reference:url,community.emergingthreats.net/t/cryptbot-stealer-update-on-rules/790/3; classtype:trojan-activity; sid:2054399; rev:1; metadata:tls_state plaintext, created_at 2024_07_08, deployment Perimeter, malware_family Cryptbot, confidence High, signature_severity Major, updated_at 2024_07_08, reviewed_at 2025_04_21;)