Prelim IOCs on Citrix NetScaler we are look for any webshell. The TAs have been observed deploying PHP-based web shells using file extensions other than .php
i.e. AddHandler application/x-httpd-php .[ext]
We are monitoring these Files specifically
/etc/httpd.conf
/nsconfig/httpd.conf
/flash/nsconfig/httpd.conf
for any new lines or unexpected unauthorised content.