alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (Sidewinder CnC?)"; flow:from_server,established; tls_cert_subject; content:""; nocase; fast_pattern; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; metadata: former_category MALWARE; reference:url,; classtype:trojan-activity; sid:2028568; rev:1; metadata:attack_target Client_Endpoint, deployment Perimeter, tag SSL_Malicious_Cert, tag Sidewinder, signature_severity Major, created_at 2019_09_10, performance_impact Low, updated_at 2019_09_10;)

Added 2019-09-10 20:12:59 UTC

Topic revision: r1 - 2019-09-11 - TWikiGuest
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