Sophos

W32/Sdbot-BLW

Aliases
  • Backdoor.Win32.SdBot.apx
  • W32/Sdbot.worm.gen.ay
  • WORM_SDBOT.DVT
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 5 May 2006 04:14:03 (GMT)
Detected by All Sophos products
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Action

More Information

W32/Sdbot-BLW is a network worm and IRC backdoor Trojan for the Windows platform.

W32/Sdbot-BLW spreads to remote network shares protected by weak passwords and to computers vulnerable to common exploits, including LSASS (MS04-011), RPC-DCOM (MS04-012), PNP (MS05-039) and ASN.1 (MS04-007).

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

When first run W32/Sdbot-BLW copies itself to <System>\netbtd.exe.

The file netbtd.exe is registered as a new system driver service named "NetBTD", with a display name of "NetBTD(ntbtd)" and a description of"Net bios background information transfer 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\NetBTD\
HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_NETBTD\

W32/Sdbot-BLW sets the following registry entries, disabling the automatic startup of other software:

HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
AutoShareServer
0

HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
AutoShareWks
0

HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\parameters
AutoShareServer
0

HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\parameters
AutoShareWks
0

HKLM\SYSTEM\CurrentControlSet\Services\wscsvc
Start
4

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\Microsoft\Security Center
AntiVirusDisableNotify
1

HKLM\SOFTWARE\Microsoft\Security Center
AntiVirusOverride
1

HKLM\SOFTWARE\Microsoft\Security Center
FirewallDisableNotify
1

HKLM\SOFTWARE\Microsoft\Security Center
FirewallOverride
1

HKLM\SOFTWARE\Microsoft\Security Center
UpdatesDisableNotify
1

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile
EnableFirewall
0

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile
EnableFirewall
0

HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DoNotAllowXPSP2
1

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

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