BKDR_ZEGOST.AE

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes then deletes itself afterward.

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.

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 copies of itself into the affected system and executes them:

• %Program Files%\Ruopoq Ikgew\Qxtikks.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It creates the following folders:

• %Program Files%\Ruopoq Ikgew

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It executes then deletes itself afterward.

Autostart Technique

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random}
ImagePath = "%Program Files%\Ruopoq lkgew\Qxtikks.exe"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random}

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

• 12345
• 12346
• 12347
• 12348
• 12349

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

• Screen Capture
• Record audio and webcam video
• List, Create and Delete Services
• Start/Stop services
• Log keyboard and mouse activities
• Perform remote shell
• Search/Manipulate Files
• Get System Information

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• {BLOCKED}.{BLOCKED}.23.77

Process Termination

This backdoor terminates the following processes if found running in the affected system's memory:

• 360tray.exe
• avp.exe
• KvMonXP.exe
• RavMonD.exe
• 360sd.exe
• Mcshield.exe
• egui.exe
• NOD32
• kxetray.exe
• knsdtray.exe
• TMBMSRV.exe
• avcenter.exe
• ashDisp.exe
• Avast

Download Routine

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

• http://{BLOCKED}r.{BLOCKED}e.qq.com/946851661
• http://{BLOCKED}r.{BLOCKED}6.tk
• http://{BLOCKED}s.{BLOCKED}8.com

Information Theft

This backdoor s configuration file contains the following information:

• C&C Server / URL title of accessed URL