Sophos

W32/Tilebot-BH

Aliases
  • W32/Sdbot.worm.gen.n
  • WORM_SDBOT.CKS
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 17 November 2005 21:28:39 (GMT)
Detected by All Sophos products
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Action

More Information

W32/Tilebot-BH is network worm with backdoor functionality for the Windows platform.

W32/Tilebot-BH 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. The backdoor component of W32/Tilebot-BH can be instructed to perform the following functions:

scan networks for vulnerabilities
take part in distributed denial of service (DDoS) attacks
packet sniffing
shutdown security related software
download/execute arbitrary files
start an ftp server
start a Proxy server

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

W32/Tilebot-BH spreads through network shares protected by weak passwords, MS-SQL servers and through various operating system vulnerabilities, such as LSASS (MS04-011), RPC-DCOM (MS04-012), PNP (MS05-039) and ASN.1 (MS04-007)

Patches for the vulnerabilities exploited by W32/Tilebot-BH can be obtained from Microsoft at:

MS04-007
MS04-011
MS04-012
MS05-039

When first run W32/Tilebot-BH copies itself to <Windows folder>\WinVid32.exe and creates the file <Windows system folder>\rdriv.sys.

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

The file WinVid32.exe is registered as a new system driver service named "Windows 32 Bit Drivers", with a display name of "Windows 32 Bit" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\Windows 32 Bit Drivers\

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-BH 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\

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