W32/Tilebot-F

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Please read the instructions for removing W32/Tilebot-F.

W32/Tilebot-F is a worm and IRC backdoor Trojan for the Windows platform.

W32/Tilebot-F spreads to other network computers by exploiting common buffer overflow vulnerabilites, including LSASS (MS04-011) and PnP (MS05-039).

W32/Tilebot-F 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-F includes functionality to:

- carry out DDoS flooder attacks
- silently download, install and run new software
- access the internet and communicate with a remote server via HTTP
- steal information from the computer including user account passwords from the protected storage areas

When first run W32/Tilebot-F copies itself to <Windows>\smsc.exe and creates the file <System>\rdriv.sys.

The file rdriv.sys is detected as Troj/Rootkit-W.

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

MS04-011
MS05-039 W32/Tilebot-F is a worm and IRC backdoor Trojan for the Windows platform.

W32/Tilebot-F spreads to other network computers by exploiting common buffer overflow vulnerabilites, including LSASS (MS04-011) and PnP (MS05-039).

W32/Tilebot-F 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-F includes functionality to:

- carry out DDoS flooder attacks
- silently download, install and run new software
- access the internet and communicate with a remote server via HTTP
- steal information from the computer including user account passwords from the protected storage areas

When first run W32/Tilebot-F copies itself to <Windows>\smsc.exe and creates the file <System>\rdriv.sys.

The file rdriv.sys is detected as Troj/Rootkit-W.

The file smsc.exe is registered as a new system driver service named "WINSMSC", with a display name of "System Messenger 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\WINSMSC

HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINSMSC

The file rdriv.sys is registered as a new system driver service named "rdriv", with a display name of "rdriv". Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\rdriv\

W32/Tilebot-F attempts to terminate services with the following names in order to disrupt various security processes including the Windows firewall and Windows critical updates:

Tlntsvr
RemoteRegistry
Messenger
wscsvc

W32/Tilebot-F 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\wscsvc
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

HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\
Microsoft\windows\CurrentVersion\Internet Settings
ProxyEnable
1

Registry entries are created under:

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

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

MS04-011
MS05-039