Updated README.md to include SSL Redirector tips

Using SSL Proxy Engine in Apache

README.md

@@ -30,6 +30,7 @@ THANK YOU to all of the authors of the content referenced in this wiki and to al
     - [iptables for HTTP](#iptables-for-http)
     - [Payloads and Web Redirection](#payloads-and-web-redirection)
     - [C2 Redirection](#c2-redirection)
+    - [C2 Redirection with HTTPS](#C2-redirection-with-https)
     - [Other Apache mod_rewrite Resources](#other-apache-mod_rewrite-resources)
 - [Modifying C2 Traffic](#modifying-c2-traffic)
   - [Cobalt Strike](#cobalt-strike)
@@ -311,6 +312,26 @@ The intention behind redirecting C2 traffic is twofold: obscure the backend team
 * [Cobalt Strike HTTP C2 Redirectors with Apache mod_rewrite - Jeff Dimmock](https://bluescreenofjeff.com/2016-06-28-cobalt-strike-http-c2-redirectors-with-apache-mod_rewrite/)
 * [Expand Your Horizon Red Team – Modern SAAS C2 - Alex Rymdeko-Harvey (@killswitch-gui)](https://cybersyndicates.com/2017/04/expand-your-horizon-red-team/)
 
+### C2 Redirection with HTTPS
+
+Building on "C2 Redirection" above, another method is to have your redirecting server use Apache's SSL Proxy Engine to accept inbound SSL requests, and proxy those to requests to a reverse-HTTPS listener. Encryption is used at all stages, and you can rotate SSL certificates on your redirector as needed.
+
+To make this work with your mod_rewrite rules, you need to place your rules in **"/etc/apache2/sites-available/000-default-le-ssl.conf"** assuming you've used LetsEncrypt (aka CertBot) to install your certificate. Also, to enable the SSL ProxyPass engine, you'll need the following lines in that same config file:
+
+```bash
+# Enable the Proxy Engine
+SSLProxyEngine On
+
+# Tell the Proxy Engine where to forward your requests
+ProxyPass / https://DESTINATION_C2_URL:443/
+ProxyPassReverse / https://DESTINATION_C2_URL:443/
+
+# Disable Cert checking, useful if you're using a self-signed cert
+SSLProxyCheckPeerCN off
+SSLProxyCheckPeerName off
+SSLProxyCheckPeerExpire off
+```
+
 ### Other Apache mod_rewrite Resources
 * [mod-rewrite-cheatsheet.com](http://mod-rewrite-cheatsheet.com/)
 * [Official Apache 2.4 mod_rewrite Documentation](http://httpd.apache.org/docs/current/rewrite/)
@@ -452,4 +473,4 @@ A BIG THANK YOU to all the following people (listed alphabetically) who contribu
 * [@n0pe_sled - Julian Catrambone](https://twitter.com/n0pe_sled)
 * [@tifkin_ - Lee Christensen](https://twitter.com/tifkin_)
 * [@vysecurity - Vincent Yiu](https://twitter.com/vysecurity)
-* [@xorrior - Chris Ross](https://twitter.com/xorrior)
+* [@xorrior - Chris Ross](https://twitter.com/xorrior)