ELF_XORDDOS.A

This backdoor may be downloaded by other malware/grayware from remote sites.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

Arrival Details

This backdoor may be downloaded by the following malware/grayware from remote sites:

• UNIX_XORDDOS.A

Installation

This backdoor drops the following copies of itself into the affected system:

• /boot/{random value}
• /lib/udev/udev

Autostart Technique

This backdoor drops the following files:

• /etc/cron.hourly/cron.sh (Cron is a time-based job scheduler in Unix-like computer operating systems)

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• Start Denial of Service
• Stop Denial of Service
• Update malware
• Download and execute file
• Terminate Process
• Request MD5 Hash of running malware

It connects to the following websites to send and receive information:

• http://{BLOCKED}.{BLOCKED}.9.228

As of this writing, the said servers are currently inaccessible.

Rootkit Capabilities

This backdoor also has rootkit capabilities, which enables it to hide its processes and files from the user.

Download Routine

This backdoor connects to the following URL(s) to download its configuration file:

• http://{BLOCKED}o.3000uc.com/config.rar