BKDR_FARFLI.AHZ

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 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%\Oklm\Tklmnopqr.jpg

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It creates the following folders:

• %Program Files%\Oklm

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\{random number 1}\
Parameters
ServiceDll = "%Program Files%\Oklm\Tklmnopqr.jpg"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\{random number 1}

HKEY_LOCAL_MACHINE\SOFTWARE\{random number 2}

HKEY_LOCAL_MACHINE\SOFTWARE\{random number 1}\
Parameters

HKEY_CURRENT_USER\NetSubKey

Backdoor Routine

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

• 8000

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}.66.222

Other Details

This backdoor connects to the following URL(s) to get the affected system's IP address:

• http://baidu.com/ip.txt

NOTES:

The C&C Server is obtained from the following URL:

• user.{BLOCKED}e.qq.com/36907034