alert dns $HOME_NET any -> any any (msg:"ET MALWARE Fake ProtonVPN/AZORult CnC Domain Query"; dns.query; content:"accounts.protonvpn.store"; nocase; bsize:24; reference:url,securelist.com/azorult-spreads-as-a-fake-protonvpn-installer/96261/; classtype:command-and-control; sid:2029523; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_02_20, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_10_30;)