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Rev: 3 • Aug 26, 2021, 12:00 PMET MALWARE SNIcat - Detected C2 Commands (CB)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SNIcat - Detected C2 Commands (CB)"; flow:established,to_server; tls.sni; content:"CB-"; startswith; fast_pattern; pcre:"/^CB-[A-Za-z0-9]{16}\./"; reference:url,mnemonic.no/blog/introducing-snicat/; reference:url,github.com/mnemonic-no/SNIcat/blob/master/signatures/snicat.rules; classtype:command-and-control; sid:2033804; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_26, deployment Perimeter, deployment SSLDecrypt, malware_family SNIcat, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;)
Aug 26, 2021, 12:00 PM
May 3, 2022, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 9, 2025, 9:34 PM
rules/emerging-malware.rules