alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (DonotGroup? Stage 2 CnC?)"; flow:from_server,established; tls_cert_subject; content:""; nocase; isdataat:!1,relative; fast_pattern; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; metadata: former_category TROJAN; classtype:trojan-activity; sid:2027297; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, deployment Perimeter, tag APT, tag DonotGroup?, signature_severity Major, created_at 2019_04_30, malware_family YTY_Framework, updated_at 2019_04_30;)

Added 2019-04-30 18:10:57 UTC

Topic revision: r1 - 2019-04-30 - TWikiGuest
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