alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] GandCrab v.5 SSL Cert"; flow:established, to_client; content:"|3082|"; depth:600; content:"Let's Encrypt1"; distance:0; flowbits:noalert; flowbits:set, FB709724_; classtype:trojan-activity; metadata:created_at 2018_10_11; reference:url, github.com/ptresearch/AttackDetection; sid:11003915; rev:2;)