alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (CobaltStrike? CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN=ciscoupdt.com"; 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:url,sslbl.abuse.ch/ssl-certificates/sha1/ddb59d8cc93688bbf4925c7d27462b70e53225cb/; classtype:trojan-activity; sid:2027082; 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_03_13, malware_family CobaltStrike?, performance_impact Low, updated_at 2019_03_13;)

Added 2019-03-13 19:01:02 UTC


Topic revision: r1 - 2019-03-13 - TWikiGuest
 
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