One of the most favourite payloads observed in the wild is "/bin/rm -rf / >/dev/null 2>&1". This payload will attempt to remove all accessible files on the system as a background process with all messages re-directed to waste disposal. Since system security is lax at many sites, there are normally thousands of files with permission bit settings of octal 777. All files on the system with this permission setting will be removed by this attack. Additionally, all files owned by the user, their group or anyone else on the system whose files are write accessible to the user, will be removed. This payload is not limited to use by Trojan horses but can be utilised by any form of attack. Typically, a time bomb can be created by using the "cron" or "at" utilities of the Unix system to execute this command directly at the specified time.