Sophos

W32/Tilebot-BK

Aliases
  • Backdoor.Win32.SdBot.aad
  • W32/Sdbot.worm.gen.bz
  • W32.Spybot.Worm
Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Protection available since 18 November 2005 21:19:20 (GMT)
Last updated 26 November 2005 03:33:34 (GMT)
Detected by All Sophos products
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  • Endpoint Security and Control 9.0
  • Small business solutions 4.0

Action

More Information

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

W32/Tilebot-BK spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012) and WKS (MS03-049) (CAN-2003-0812) and by copying itself to network shares protected by weak passwords.

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

When first run W32/Tilebot-BK copies itself to <Windows folder>\80xFire.exe and creates the file <Windows system folder>\rdriv.sys.

The file rdriv.sys is detected by Sophos's anti-virus products as Troj/Rootkit-W.

The file 80xFire.exe is registered as a new system driver service named "80xFire", with a display name of "80xFire daemon" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\80xFire\

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-BK 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\

The following patches for the operating system vulnerabilities exploited by W32/Tilebot-BK are available from Microsoft:
MS03-049
MS04-011
MS04-012

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