alert dns $HOME_NET any -> any any (msg:"ET MALWARE DCRat Related CnC Domain in DNS Lookup"; dns.query; content:"dcrat.ru"; nocase; bsize:8; reference:url,blogs.blackberry.com/en/2022/05/dirty-deeds-done-dirt-cheap-russian-rat-offers-backdoor-bargains; classtype:domain-c2; sid:2036637; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_05_20, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_20;)