W32/Tilebot-T

Please follow the instructions for removing worms.

W32/Tilebot-T is a worm for the Windows platform.

W32/Tilebot-T spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011) and RPC-DCOM (MS04-012) and by copying itself to network shares protected by weak passwords.

The following patches for the operating system vulnerabilities exploited by W32/Tilebot-T can be obtained from the Microsoft website:

MS04-011
MS04-012

W32/Tilebot-T runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.

W32/Tilebot-T includes functionality to access the internet and communicate with a remote server via HTTP.

When first run W32/Tilebot-T copies itself to <Windows folder>\fear32.exe.

The file fear32.exe is registered as a new system driver service named "FSVC", with a display name of "Fear Service" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\FSVC\

W32/Tilebot-T sets the following registry entries, disabling the automatic startup of other software:

HKLM\SYSTEM\CurrentControlSet\Services\Messenger
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr
Start
4

Registry entries are set as follows:

HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DoNotAllowXPSP2
1

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

Registry entries are created under:

HKLM\SOFTWARE\Microsoft\Security Center\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile\