alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ROM/BackOff C2 SSL Cert"; flow:established,to_client; tls.cert_serial; content:"00:ED:FD:42:65:DE:77:35:EA"; fast_pattern; tls.cert_subject; content:"O=Default Company Ltd"; reference:url,blog.fortinet.com/post/rom-a-new-version-of-the-backoff-pos-malware; classtype:command-and-control; sid:2019635; rev:4; metadata:attack_target Client_Endpoint, created_at 2014_11_04, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_23;)