BKDR_KULUOZ.QVG

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 then deletes itself afterward.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website 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 copies of itself into the affected system:

• %AppDataLocal%\{random}.exe

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

It adds the following processes:

• svchost.exe

It executes then deletes itself afterward.

It injects codes into the following process(es):

• created svchost.exe

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• Sleep/Idle (2 minutes)
• Download and execute arbitrary file
• Update and uninstall itself
• Visit URL

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

• http://{BLOCKED}.{BLOCKED}.12.83:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.162.42:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.132.29:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.178.27:8090/{generated value}
• http://{BLOCKED}.{BLOCKED}.41.122:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.253.250:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.84.62:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.29.157:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.162.72:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.162.73:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.162.79:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.170.172:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.147.14:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.130.98:8090/{generated value}
• http://{BLOCKED}.{BLOCKED}.139.235:8080/{generated value}
• http://{BLOCKED}.{BLOCKED}.200.250:8090/{generated value}
• http://{BLOCKED}.{BLOCKED}.185.185:8080/{generated value}

NOTES:

If the malware fails to connect to any of the C&C servers, it creates the following registries:

HKEY_CURRENT_USER\SOFTWARE\{random}

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run {random} = "%Application Data%\{random}.exe"

HKEY_CURRENT_USER\SOFTWARE\{random}
{random} = "{hex values}"

The {generated value} is based on user name, Local IP, running debugger, and malware build date and version.