BKDR_XTRAT.KD

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.

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:

• %Windows%\InstallDir\Server.exe

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

It creates the following folders:

• %Windows%\InstallDir

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

Other System Modifications

This backdoor deletes the following files:

• %User Profile%\Windows\KdXTsbjJ6.xtr

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\KdXTsbjJ6

It adds the following registry entries:

HKEY_CURRENT_USER\Software\KdXTsbjJ6
ServerStarted = "8/28/2013 0:00:32 AM"

HKEY_CURRENT_USER\Software\KdXTsbjJ6
InstalledServer = "%Windows%\InstallDir\Server.exe"

Dropping Routine

This backdoor drops the following files:

• %User Profile%\Windows\KdXTsbjJ6.cfg
• %User Temp%\x.html

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This backdoor connects to the following possibly malicious URL:

• http://uranio6.{BLOCKED}p.biz:20600/1234567890.functions

This report is generated via an automated analysis system.