Sophos

W32/Tilebot-AW

Aliases
  • WORM_SDBOT.CKT
  • Backdoor.Win32.SdBot.aad
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 7 November 2005 04:01:32 (GMT)
Last updated 22 December 2005 19:10:39 (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-AW is a worm and IRC backdoor Trojan for the Windows platform.

W32/Tilebot-AW spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), PNP (MS05-039) and ASN.1 (MS04-007) and by copying itself to network shares protected by weak passwords.

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

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

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

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\

The file <Windows>\svchost.exe is registered as a new system driver service named "scvhost", with a display name of "taskmng" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\scvhost\

W32/Tilebot-AW 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-AW can be obtained from the Microsoft website:

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

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