Troj/Shuckbot-A

Please follow the instructions for removing Trojans.

Windows NT/2000/XP/2003

In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. 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 entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Recycle Bin Handler =
<system folder>\recycler.exe

and delete it if it exists.

Close the registry editor.

Troj/Shuckbot-A is an IRC backdoor Trojan.

Troj/Shuckbot-A copies itself to the Windows system folder with the filename RECYCLER.EXE and sets the following entry in the registry so as to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Recycle Bin Handler =
<system folder>\recycler.exe

Troj/Shuckbot-A sets the following registry entries to try to bypass the Windows firewall:

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\
Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List\
<system folder>\recycler.exe =
<system folder>\recycler.exe:*:enabled:@xpsp2res.dll,-22005

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\
Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\
<system folder>\recycler.exe =
<system folder>\recycler.exe:*:enabled:@xpsp2res.dll,-22005

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\
Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List\
6667:TCP =
6667:TCP:*:Enabled:@xpsp2res.dll,-22005

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\
Parameters\FirewallPolicy\DomainProfile\GloballyOpenPorts\List\
6667:TCP =
6667:TCP:*:Enabled:@xpsp2res.dll,-22005

Troj/Shuckbot-A connects to an IRC server and waits for commands from a remote user. These commands include downloading and executing further files, sending information about the infected computer, and logging and sending the user's keystrokes.

Troj/Shuckbot-A has been seen sent in an email as an attachment named "Screen Shot of Site.zip" with email text including the following:

Hello,

I noticed whilst browsing your site that there were problems with some of your links, when I tried again with Internet Explorer the problems were not there so I assume that they were caused by me using the Mozilla browser.

As more people are turning to alternative browsers now it may be of help for you to know this. I have enclosed a screen capture of the problem so your team can get it fixed if you deem it an issue.