alert dns $HOME_NET any -> any any (msg:"ET MALWARE ELF/Emptiness CnC Domain in DNS Query"; dns.query; content:"bruhitsnot.tk"; nocase; endswith; reference:url,blog.netlab.360.com/emptiness-a-new-evolving-botnet/; classtype:command-and-control; sid:2027850; rev:3; metadata:affected_product Web_Browsers, affected_product Linux, attack_target Client_Endpoint, created_at 2019_08_09, deployment Perimeter, malware_family ELF_Emptiness, confidence High, signature_severity Major, updated_at 2020_09_17;)