Description
One or more trojan shell scripts were found. Trojan Shell Scripts are a tool used by attackers to execute arbitrary shell commands or browse the filesystem on a remote web-server. Usually, this is an indication that your website has been defaced and some attacker has installed this shell script to manage the web-server from remote.
Remediation
Delete the trojan shell script(s). You need to investigate the security of your website to determine the source of the security breach.