W32/Rbot-WH

Please follow the instructions for removing worms.

Replace the Hosts file from a backup or edit it in Notepad to remove the changes that the worm has made.

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 entry:

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

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.
• Check your administrator passwords and review network security.

W32/Rbot-WH is a worm which attempts to spread to remote network shares. It also contains backdoor Trojan functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.

W32/Rbot-WH copies itself to the Windows system folder with a random 4-character filename with an EXE extension and creates entries at the following locations in the registry

HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Microsofts Security Manager

HKCU\Software\Microsoft\OLE
Microsofts Security Manager

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Microsofts Security Manager

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Microsofts Security Manager

HKLM\SOFTWARE\Microsoft\Ole
Microsofts Security Manager

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsofts Security Manager

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsofts Security Manager

HKLM\SYSTEM\ControlSet001\Control\Lsa
Microsofts Security Manager

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Microsofts Security Manager

Each value is set to the random file name, this causes it to be run on start-up.

W32/Rbot-WH sets the following registry entries:

HKWH\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKWH\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

W32/Rbot-WH may try to modify the HOSTS file located in the subfolder drivers\etc\hosts of the Windows system folder, mapping selected anti-virus websites to the loopback address 127.0.0.1 in an attempt to prevent access to these sites. Typically the following mappings will be appended to the HOSTS file:

127.0.0.1 www.symantec.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 symantec.com
127.0.0.1 www.sophos.com
127.0.0.1 sophos.com
127.0.0.1 www.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 liveupdate.symantecliveupdate
127.0.0.1 www.viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 f-secure.com
127.0.0.1 www.f-secure.com
127.0.0.1 kaspersky.com
127.0.0.1 kaspersky-labs.com
127.0.0.1 www.avp.com
127.0.0.1 www.kaspersky.com
127.0.0.1 avp.com
127.0.0.1 www.networkassociates.com
127.0.0.1 networkassociates.com
127.0.0.1 www.ca.com
127.0.0.1 ca.com
127.0.0.1 mast.mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 www.my-etrust.com
127.0.0.1 download.mcafee.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 nai.com
127.0.0.1 www.nai.com
127.0.0.1 update.symantec.com
127.0.0.1 updates.symantec.com
127.0.0.1 us.mcafee.com
127.0.0.1 liveupdate.symantec.com
127.0.0.1 customer.symantec.com
127.0.0.1 rads.mcafee.com
127.0.0.1 trendmicro.com
127.0.0.1 www.trendmicro.com
127.0.0.1 www.grisoft.com

W32/Rbot-WH may attempt to terminate a large number of processes related to anti-virus, security, and system software, including those related to the following executables:

SWEEP95.EXE
BLACKICE.EXE
ANTI-TROJAN.EXE
F-PROT95.EXE
GATOR.EXE
SCAN95.EXE
IEXPLORER.EXE
REGEDIT.EXE

W32/Rbot-WH may attempt to gather information on programs on the machine from the registry.