alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (Possible APT33 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; classtype:trojan-activity; sid:2028968; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, deployment Perimeter, tag APT33, signature_severity Major, created_at 2019_11_13, performance_impact Low, updated_at 2019_11_13;)

Added 2019-11-13 18:55:27 UTC

Topic revision: r1 - 2019-11-13 - TWikiGuest
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