W32/Agobot-OG

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\
ATI Rage3d Pro
= "AtiRage4dPro.exe"

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\
ATI Rage3d Pro
= "AtiRage4dPro.exe"

and delete them if they exist.

Close the registry editor.

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

W32/Agobot-OG is capable of spreading to computers on the local network protected by weak passwords.

When first run, W32/Agobot-OG copies itself to the Windows system folder as AtiRage4dPro.exe and creates the following registry entries to run itself on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
ATI Rage3d Pro
= "AtiRage4dPro.exe"

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\
ATI Rage3d Pro
= "AtiRage4dPro.exe"

The Trojan runs continuously in the background providing backdoor access to the computer.

W32/Agobot-OG attempts to terminate and disable various Anti-Virus and security related programs and modifies the HOSTS file located at %SYSTEM%\Drivers\etc\HOSTS, mapping selected antivirus 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.com
127.0.0.1 www.viruslist.com
127.0.0.1 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 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

W32/Agobot-OG will also hide all files which contain the string 'soun'.