BKDR_FYNLOSKI.BV

This backdoor disguises as a revolutionary document in order to lure Syrian activists into downloading and executing the malware.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor gathers certain information on the affected system. It logs active windows and user key strokes. It is capable of executing several commands on the affected system.

This backdoor opens a hidden Internet Explorer window. It connects to a website to send and receive information.

Installation

This backdoor drops the following files:

• %User Temp%\explorer.exe - also detected as BKDR_FYNLOSKI.BV
• %User Temp%\Firefox.dll - encrypted component detected as BKDR_FYNLOS.ENC
• %User Temp%\Aleppo plan.pdf - non-malicious PDF file

(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.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• DC_MUTEX-F54S21D

Autostart Technique

This backdoor drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• (empty).lnk

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\DC3_FEXEC

Backdoor Routine

This backdoor opens a hidden Internet Explorer window.

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

• {BLOCKED}.{BLOCKED}.0.28

Stolen Information

This backdoor saves the stolen information in the following file:

• %User Temp%\dclogs.sys

(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.)

NOTES:

This backdoor arrives as a RAR archive that is sent over Skype by a malicious user.

It gathers the following information from the affected system:

• Administrative rights
• Computer/User name
• HWID
• Language/Country
• Operating System information
• RAM used
• Web cam information

It logs active windows and user key strokes.

It is capable of executing the following commands:

• Disable notifications of antivirus software
• Display a message box
• Download an updated copy of itself
• Download and execute files
• List active windows
• Manipulate files
• Manipulate processes
• Manipulate registries
• Modify privileges
• Modify the hosts file
• Modify user groups
• Monitor webcam activity
• Open command prompt
• Steal passwords
• Uninstall applications
• Uninstall itself