alert dns $HOME_NET any -> any any (msg:"ET MALWARE BlackTech ELF/TSCookie CnC Observed in DNS Query"; dns.query; content:"app.dynamicrosoft.com"; nocase; endswith; reference:url,blogs.jpcert.or.jp/ja/2020/02/elf_tscookie.html; classtype:domain-c2; sid:2029559; rev:3; metadata:affected_product Web_Browsers, affected_product Linux, attack_target Client_Endpoint, created_at 2020_03_03, deployment Perimeter, malware_family TScookie, malware_family BlackTech, confidence High, signature_severity Major, updated_at 2020_11_03;)