Versions (4)
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Rev: 1 • Nov 10, 2021, 12:00 PMET MALWARE Observed Malicious Cobalt Strike SSL Cert (setupfastonline .com)
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious Cobalt Strike SSL Cert (setupfastonline .com)"; flow:established,to_client; tls.cert_subject; content:"CN=setupfastonline.com"; bsize:22; fast_pattern; reference:url,www.cert.ssi.gouv.fr/uploads/CERTFR-2021-CTI-009.pdf; classtype:domain-c2; sid:2034403; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_11_10, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_10;)
Nov 10, 2021, 12:00 PM
Nov 10, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 8, 2025, 9:34 PM
rules/emerging-malware.rules