W32/Agobot-GS

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.

Check your administrator passwords and review network security.

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\
Winampa = winampa.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Winampa = winampa.exe

and delete them if they exist.

Close the registry editor.

W32/Agobot-GS is an IRC backdoor Trojan and network worm.

W32/Agobot-GS copies itself to network shares protected by weak passwords.

When first run W32/Agobot-GS copies itself to the Windows system folder as winampa.exe. The worm will create the following registry entries to ensure it is
run at system logon:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Winampa = winampa.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Winampa = winampa.exe

On NT-based version of Windows the worm creates a new service named "Winampa" with the startup property set to automatic, so that the service starts automatically each time Windows is started.

Each time W32/Agobot-GS is run it attempts to connect to a remote IRC server
and join a specific channel. The worm then runs in the background allowing a remote intruder to issue commands which control the computer via IRC channels.

W32/Agobot-GS will terminate and disable various anti-virus and security related programs.

W32/Agobot-GS will write to the hosts file so that various security related internet sites can no longer be accessed. These sites include:

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