alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED SSL/TLS Certificate Observed (Buer Loader)"; flow:established,to_client; tls_cert_subject; content:"CN=prioritywireless.club"; fast_pattern; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; classtype:command-and-control; sid:2029003; rev:1; metadata:attack_target Client_Endpoint, created_at 2019_11_19, malware_family BuerLoader, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_11_19;)