alert dns $HOME_NET any -> any any (msg:"ET MALWARE Symbiote CnC Domain in DNS Lookup (caixa .wf)"; dns.query; dotprefix; content:".caixa.wf"; nocase; endswith; reference:url,blogs.blackberry.com/en/2022/06/symbiote-a-new-nearly-impossible-to-detect-linux-threat; classtype:trojan-activity; sid:2036954; rev:1; metadata:attack_target Client_and_Server, created_at 2022_06_09, deployment Perimeter, malware_family Symbiote, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_06_09;)