alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (Unattributed CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN="; content:"internal-message.app"; distance:0; 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 TROJAN; reference:url,krebsonsecurity.com/wp-content/uploads/2019/04/wiproiocs.txt; classtype:trojan-activity; sid:2027223; rev:1; metadata:deployment Perimeter, tag SSL_Malicious_Cert, signature_severity Major, created_at 2019_04_18, performance_impact Low, updated_at 2019_04_18;)

Added 2019-04-18 19:01:24 UTC


Topic revision: r1 - 2019-04-18 - TWikiGuest
 
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