W32/Sdbot-XR

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entries:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\RunServices\

and remove any reference to any file you deleted.

Close the registry editor.

Check the following items

• To renable DCOM you can edit the registry, but it's better to use Dcomcnfg.exe. See Microsoft article 825750 for details.
• The HKLM\SYSTEM\CurrentControlSet\Control\Lsa\restrictanonymous = "1" setting does not allow enumeration of SAM accounts and names. The default is "0". It can be changed in Local Security Policy. See Microsoft article 246261 for details.

W32/Sdbot-XR is an IRC backdoor Trojan and network worm.

W32/Sdbot-XR attempts to spread to remote network shares protected by weak passwords and computers vulnerable to common exploits, including LSASS (MS04-011), RPC-DCOM (MS04-012) and WKS (MS03-049). For patches for these vulnerabilities, see:

MS04-011
MS04-012
MS03-049

W32/Sdbot-XR opens up a backdoor, allowing unauthorised remote access to the infected computer via the IRC network, while running in the background as a service process.

W32/Sdbot-XR can receive commands from a remote attacker allowing them to control the infected computer.

The worm creates a file "msdirectx.sys" which is detected by Sophos as Troj/NtRootK-F.

W32/Sdbot-XR copies itself to the Windows system folder as winjes.exe and creates the following registry entries in order to run automatically on computer login:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Compaq Jes Drivers
winjes.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Compaq Jes Drivers
winjes.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Compaq Jes Drivers
winjes.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices\
Compaq Jes Drivers
winjes.exe

On NT-based versions of Windows (NT,2000,XP) msdirectx.sys is registered as a service process, with a servicename and displayname of "msdirectx". Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\msdirectx

W32/Sdbot-XR also changes system security by altering the following registry entries:

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4