alert tcp $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET DELETED Captcha Malware C2 SSL Certificate"; flow:established,from_server; content:"|55 04 03|"; content:"|0b|Mojolicious"; distance:1; within:17; content:"|55 04 0a|"; distance:0; content:"|0b|Mojolicious"; distance:1; within:17; reference:url,community.emc.com/community/connect/rsaxchange/netwitness/blog/2014/03/25/captcha-protected-malware-downloader; classtype:command-and-control; sid:2018322; rev:2; metadata:attack_target Client_Endpoint, created_at 2014_03_26, deployment Perimeter, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2019_09_10;)