alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Blackrota)"; flow:established,to_client; tls.cert_subject; content:"C=US, ST=Arizona, L=Scottsdale, O=Amazon, OU=Starfield Class, CN=blackrato.ga"; bsize:77; fast_pattern; tls.cert_issuer; content:"C=US, ST=Arizona, L=Scottsdale, O=Amazon, OU=Starfield Class, CN=blackrato.ga"; bsize:77; reference:md5,04dab9530bbcb7679ff5498400417e40; reference:url,blog.netlab.360.com/blackrota-an-obfuscated-backdoor-written-in-go-en/; classtype:domain-c2; sid:2031236; rev:1; metadata:attack_target Client_and_Server, created_at 2020_11_25, deployment Perimeter, malware_family Blackrota, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_25, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)