Sophos

W32/Tilebot-AK

Aliases
  • Backdoor.Win32.SdBot.xd
  • W32/Sdbot.worm.gen.h
Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
  • Chat programs
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Protection available since 28 October 2005 22:22:06 (GMT)
Last updated 18 November 2005 22:22:37 (GMT)
Detected by All Sophos products
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Action

More Information

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

W32/Tilebot-AK spreads to other network computers via network shares, and by exploiting common buffer overflow vulnerabilities, including: WKS (MS03-049) (CAN-2003-0812), PNP (MS05-039) and ASN.1 (MS04-007). It may also spread via chat programs.

W32/Tilebot-AK 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.

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

The file lsass.exe is registered as a new system driver service named "lsass", with a display name of "Local Security Authority Subsystem 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\lsass\

W32/Tilebot-AK 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\

Patches for the operating system vulnerabilities exploited by W32/Tilebot-AK are available from Microsoft :
MS03-049
MS04-007
MS05-039

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