Backdoor:W32/Spyrat.D

Summary

A remote administration utility that bypasses normal security mechanisms to secretly control a program, computer or network.

Disinfection & Removal

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

Technical Details

Installation

The malware creates a dummy winlogon.exe process where it runs its malicious threads and drops the following copy:

• %appdata%\Winlogon\winlogon.exe

It also creates a legitimate winlogon.exe to %windir%\system32\install\Windows.exe.

Registry

The malware creates the following registry launch point:

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run %path_of_executed_file% = %appdata%\Winlogon\winlogon.exe

The following registry entries would also be created:

• HKEY_CURRENT_USER\Software\chuck norris FirstExecution = %date_time% NewIdentification = "chuck norris" NewGroup = 2

Backdoor Functionality

The malware is a reverse connection remote administration tool. It connects to chucknorris.zapto.org at port 150 to get its command.