BKDR_ETUMBOT.AKV

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

It connects to certain websites to send and receive information.

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor drops the following files:

• %User Temp%\~DF4E74.doc

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It drops and executes the following files:

• %Application Data%\Microsoft\Windows\WindowsUpdate.exe - detected as BKDR_ETUMBOT.AKV

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
WindowsUpdate = "%Application Data%\Microsoft\Windows\WindowsUpdate.exe"

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

• Perform Remote Shell
• Download Files
• Upload Files
• Execute Files
• Sleep

Information Theft

This backdoor gathers the following data:

• User Name
• Computer Name
• IP Address
• OS Version
• Proxy Server

Other Details

This backdoor connects to the following website to send and receive information:

• http://{BLOCKED}.{BLOCKED}.46.102:443/XEL{random digits}={random digits}.cgi?{Encrypted Information}

It opens the following files:

• %User Temp%\~DF4E74.doc

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

NOTES:
Where {Encrypted Information} contains encrypted User Name, Host Name, IP Address, OS Version, and Proxy Server.