alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (BrushaLoader? CnC?)"; flow:from_server,established; tls_cert_subject; content:""; nocase; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; metadata: former_category TROJAN; reference:md5,2bd9a6ea29182f5ec6acafe032fbeaab; classtype:trojan-activity; sid:2026861; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, tag SSL_Malicious_Cert, signature_severity Major, created_at 2019_01_29, malware_family BrushaLoader?, performance_impact Low, updated_at 2019_01_29;)

Added 2019-01-29 18:40:10 UTC

Topic revision: r1 - 2019-01-29 - TWikiGuest
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