W32/Agobot-JX

Please follow the instructions for removing worms.

Check your administrator passwords and review network security.

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\
napv.exe = wupdate.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
napv.exe = wupdate.exe

and delete them if they exist.

Close the registry editor.

W32/Agobot-JX is a backdoor Trojan and worm which spreads to computers
protected by weak passwords and to computers infected with variants of
W32/MyDoom.

When first run, W32/Agobot-JX moves itself to the Windows system folder as
wupdate.exe and creates the following registry entries to run itself on system
logon:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
napv.exe = wupdate.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
napv.exe = wupdate.exe

W32/Agobot-JX also sets itself up as a windows service, with the
service name "navp.exe".

The following vulnerabilities can also be exploited to aid propagation on unpatched systems and manipulate registry keys:

Remote Procedure Call (RPC) vulnerability.
Distributed Component Object Model (DCOM) vulnerability.
RPC Locator vulnerability.
IIS5/WEBDAV Buffer Overflow vulnerability.

For more information about these Windows vulnerabilities, please refer to the following Microsoft Web pages:

Microsoft Security Bulletin MS03-001
Microsoft Security Bulletin MS03-007
Microsoft Security Bulletin MS03-039.

W32/Agobot-JX will hide all files whose filenames begin with "sound".

Each time the Trojan is run it attempts to connect to a remote IRC server
and join a specific channel.

The Trojan then runs continuously in the background, allowing a remote
intruder to access and control the computer via IRC channels.

The Trojan attempts to terminate and disable various anti-virus and security-
related programs and modifies the HOSTS file located at
<WINDOWS>\System32\Drivers\etc\HOSTS, mapping selected anti-virus websites to the loopback address 127.0.0.1 in an attempt to prevent access to these sites.