alert dns $HOME_NET any -> any any (msg:"ET MALWARE BlackTech ELF/TSCookie CnC Observed in DNS Query"; dns.query; content:"cybermon.fortigatecloud.com"; nocase; depth:27; endswith; reference:url,blogs.jpcert.or.jp/ja/2020/02/elf_tscookie.html; classtype:domain-c2; sid:2029587; rev:2; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2020_03_09, deployment Perimeter, malware_family ELF_TSCookie, confidence High, signature_severity Major, updated_at 2020_11_05;)