alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (SilentLibrarian)"; flow:established,to_client; tls.cert_subject; content:"edou.me"; fast_pattern; pcre:"/CN=(?:[^\r\n]+?\.)?edou\.me(?!\.)/"; reference:url,twitter.com/TeamDreier/status/1542155689631617025; classtype:domain-c2; sid:2037232; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2022_06_30, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_30;)