Windows Defender detects and removes this threat.

This family of worms can stop some programs from working and download files onto your PC, including other malware.

They spread by copying themselves to network shares and removable drives, such as USB flash drives. They can also spread though instant messages sent via instant messaging clients, such as MSN Messenger. 

Find out ways that malware can get on your PC.  

Worm:Win32/Nuqel.H is a worm that spreads via removable and shared drives.

Worm:Win32/Nuqel.I is a worm that spreads via removable and shared drives.

Worm:Win32/Nuqel.AT is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Worm:Win32/Nuqel.AO is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Worm:Win32/Nuqel.BN is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Windows Defender detects and removes this threat.

Worms automatically spread to other PCs. They can do this in a number of ways, including by copying themselves to removable drives, network folders, or spreading via email.

Find out ways that malware can get on your PC.

Worm:Win32/Nuqel.BI is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Worm:Win32/Nuqel.BH is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to facilitate its actions on an affected computer, and contact a remote host.

Worm:Win32/Nuqel.G is a worm that spreads via mapped drives and also via certain Instant Messenger applications such as Yahoo! Messenger. To automatically execute in an affected system, it modifies the system registry as well as creates a scheduled task to run its process. It may modify certain system settings, such as preventing hidden files from being displayed and disabling Task Manager. Worm:Win32/Nuqel.G may also connect to certain Web sites.

Worm:Win32/Nuqel.Q is a worm that attempts to spread by copying itself to removable drives and network shares, and via Internet chat applications. The worm may download arbitrary files, block certain system utilities and lower security on the affected computer.

Worm:Win32/Nuqel.F is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Worm:Win32/Nuqel.CT is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to faciliate its actions on an affected computer, and contact a remote host.

Worm:Win32/Nuqel.AJ is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to faciliate its actions on an affected computer, and contact a remote host.

Worm:Win32/Nuqel.AM is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to faciliate its actions on an affected computer, and contact a remote host.

Worm:Win32/Nuqel.AK is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to facilitate its actions on an affected computer, and contact a remote host.

Worm:Win32/Nuqel.AL is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to faciliate its actions on an affected computer, and contact a remote host.

Worm:Win32/Nuqel.AN is a member of Win32/Nuqel - a family of worms that may spread via removable or network drives and particular messenger applications. It may also modify a number of system settings to faciliate its actions on an affected computer, and contact a remote host.