Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Ursnif CnC)"; flow:established,to_client; tls.cert_subject; content:"CN=fingerpin.cyou"; bsize:17; fast_pattern; reference:url,www.mandiant.com/resources/blog/rm3-ldr4-ursnif-banking-fraud; classtype:trojan-activity; sid:2039704; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_11_03, deployment Perimeter, deprecation_reason Age, malware_family ursnif, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_28, reviewed_at 2024_08_28;)