alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (DCRat)"; flow:established,to_client; tls.cert_subject; content:"CN=*.dcrat.ru"; bsize:13; fast_pattern; reference:url,blogs.blackberry.com/en/2022/05/dirty-deeds-done-dirt-cheap-russian-rat-offers-backdoor-bargains; classtype:domain-c2; sid:2036639; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_05_20, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_20;)