BKDR_SERVSTAR.JQ

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 executes commands from a remote malicious user, effectively compromising the affected system.

It deletes itself after execution.

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 copies of itself into the affected system:

• %System%\DMAgent.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

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\Windows Adobe Flash Game 3.6
ImagePath = "%System%\DMAgent.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6
Security =

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6
Enum =

Backdoor Routine

This backdoor opens the following ports:

• TCP 777

It executes the following commands from a remote malicious user:

• Open a specific URL with Internet Explorer
• Download and Execute Arbitrary Files
• Update or Uninstall Itself

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

• {BLOCKED}.{BLOCKED}.59.118

Information Theft

This backdoor gathers the following data:

• Hardware Information
• Operating System

Other Details

This backdoor deletes itself after execution.

NOTES:

This backdoor opens port(s) where it listens for remote commands.