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Rev: 1 • Oct 11, 2021, 12:00 PMET MALWARE Observed Malicious FIN12 Related SSL Cert (serviceswork .net)
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious FIN12 Related SSL Cert (serviceswork .net)"; flow:established,to_client; tls.cert_subject; content:"C=US, ST=TX, L=Texas, O=serviceswork, OU=, CN=serviceswork.net"; bsize:62; fast_pattern; reference:url,www.mandiant.com/resources/fin12-ransomware-intrusion-actor-pursuing-healthcare-targets; reference:md5,f1c35cf848d984785e9c0621958fe5ae; classtype:trojan-activity; sid:2034163; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_10_11, deployment Perimeter, malware_family Fin12, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_11;)
Oct 11, 2021, 12:00 PM
Oct 11, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 8, 2025, 9:34 PM
rules/emerging-malware.rules