Sophos

W32/Tilebot-G

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

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Drops more malware
  • Installs itself in the registry
Protection available since 16 August 2005 20:13:03 (GMT)
Detected by All Sophos products
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Action

More Information

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

W32/Tilebot-G spreads to other network computers by exploiting common buffer overflow vulnerabilites, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049) (CAN-2003-0812) and MSSQL (MS02-039) (CAN-2002-0649) and by copying itself to network shares protected by weak passwords.

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

When first run W32/Tilebot-G copies itself to <Windows>\vpn.exe and creates the file <System>\DVDrealm.sys.

The file DVDrealm.sys is detected as Troj/Rootkit-AA.

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

HKLM\SYSTEM\CurrentControlSet\Services\DVDrealm\

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

HKLM\SYSTEM\CurrentControlSet\Services\VPNonDemand\

W32/Tilebot-G 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

HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings
ProxyEnable
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\

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