alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Fake IBM SSL Cert APT1"; flow:established,to_client; tls.cert_issuer; content:"O=Internet Widgits Pty Ltd"; content:"CN=IBM"; tls.cert_subject; content:"O=Internet Widgits Pty Ltd"; content:"CN=IBM"; fast_pattern; reference:url,www.mandiant.com/apt1; classtype:targeted-activity; sid:2016463; rev:5; metadata:attack_target Client_Endpoint, created_at 2013_02_22, deployment Perimeter, deprecation_reason Relevance, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_01_03;)