alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (APT32 CnC?)"; flow:from_server,established; content:"|16|"; content:"|0b|"; within:8; content:"|55 04 03|"; distance:0; content:"|12|"; distance:1; within:19; fast_pattern; content:"|55 04 06|"; distance:0; content:"|02|US"; distance:1; within:3; content:"|55 04 0a|"; distance:0; content:"|0d|Let's Encrypt"; distance:1; within:14; content:"|55 04 03|"; distance:0; content:"|1a|Let's Encrypt Authority X3"; distance:1; within:27; metadata: former_category MALWARE; classtype:trojan-activity; sid:2028898; rev:2; metadata:deployment Perimeter, tag SSL_Malicious_Cert, tag APT32, signature_severity Major, created_at 2019_10_24, performance_impact Low, updated_at 2019_10_24;)

Added 2019-10-24 19:38:14 UTC

Topic revision: r1 - 2019-10-24 - TWikiGuest
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