Worm:Win32/Gaobot.AZ is a worm that can spread across network connections by breaking weak passwords or by exploiting vulnerabilities described in Microsoft Security Bulletins MS03-001, MS03-007, or MS03-026. After the Trojan copies and runs itself on a remote computer, it connects to an IRC server to receive commands.

Win32/Spybot.BA.worm is a network worm that targets certain versions of Microsoft Windows. When a computer is infected with Win32/Bropia.D.worm, that worm drops Win32/Spybot.BA.worm on the infected computer. Win32/Spybot.BA.worm in turn spreads to other computers that do not have Microsoft Security Bulletin MS04-011 (Windows LSASS buffer overflow vulnerability) installed. Win32/Spybot.BA.worm also has backdoor capabilities, which allow attackers to control an computer through an IRC channel.

Win32/Spybot.BK.worm is a network worm that targets certain versions of Microsoft Windows. When a computer is infected with Win32/Bropia.O.worm, that worm drops Win32/Spybot.BK.worm on the infected computer. Win32/Spybot.BK.worm in turn spreads to other computers that do not have Microsoft Security Bulletin MS04-011 (Windows LSASS buffer overflow vulnerability) installed. Win32/Spybot.BK.worm also has backdoor capabilities, which allow attackers to control a computer through an IRC channel.

Win32/Sober.P@mm is a mass-mailing worm that targets computers running certain versions of Microsoft Windows. The worm sends itself as an attachment to e-mail addresses that it finds on an infected computer. The worm runs when a user opens the attachment.

Win32/Randex.FK.worm is a network worm that targets computers running certain versions of Microsoft Windows. It scans randomly generated IP addresses to spread to network shares with weak passwords. After the worm infects a computer, it connects to an IRC server to receive commands from the attacker. If your computer is infected by Win32/Randex.FK worm, you may experience system performance degradation, slower network connectivity, or system crashes.

Backdoor:Win32/Wootbot.AX is a backdoor Trojan that targets computers running certain versions of Microsoft Windows. The Trojan connects to an IRC server to receive commands from attackers. For example, an attacker can send a command to distribute the Trojan to other computers by exploiting the Windows LSASS vulnerability described in Microsoft Security Bulletin MS04-011.

Win32/Mydoom.A@mm is a mass-mailing worm that sends itself to e-mail addresses it finds on the infected computer. The worm also installs a .dll file that acts as a backdoor. After February 1, 2004, the worm attempts a denial-of-service (DoS) attack against www.sco.com.

Win32/Netsky.P@mm is a mass-mailing worm that targets computers running certain versions of Microsoft Windows. The worm sends itself to e-mail addresses that it finds on the infected computer. The worm is activated when a user opens an e-mail attachment that contains the worm. The worm also exploits a vulnerability that is fixed in Microsoft Security Bulletin MS01-020.

Worm:Win32/Hary.A!autorun is a component of Worm:Win32/Hary.A, a virus that spreads from removable media to computers, changes Internet Explorer settings, and disables certain system tools. Worm:Win32/Hary.A poses as a Microsoft Word document that when run, displays a Word document containing the text "Harry Potter is dead."

Worm:Win32/Bagle.ZD@mm is a mass-mailing e-mail worm that attempts to download and run arbitrary files from remote Web sites. Worm:Win32/Bagle.ZD@mm collects e-mail address from the local drive and also obtains e-mail addresses by checking Web site URLs included in the worm's code. The worm attempts to terminate the Windows Automatic Update service and modifies the System Registry in an attempt to disable booting into Safe Mode.

Worm:Win32/Gaobot.ZR is a network worm that targets certain versions of Microsoft Windows. It spreads by exploiting multiple vulnerabilities that are patched in various Microsoft Security Bulletins. It also spreads to writeable network shares that have weak administrator passwords to retrieve personal and system information. The worm targets certain Web sites for denial of service (DoS) attacks. The worm also has backdoor capabilities, which allow attackers to control a computer through an IRC channel.

Worm:Win32/Slenfbot.AAA is a worm that can spread via MSN Messenger, and may spread via removable drives. The worm also contains backdoor functionality that allows unauthorized access to an affected machine. This worm does not spread automatically upon installation, but must be ordered to spread by a remote attacker.

Worm:Win32/Zotob.Q is a network worm that exploits the Plug-and-Play vulnerability discussed in Microsoft Security Bulletin MS05-039. The worm targets computers running Microsoft Windows 2000 that do not have MS05-039 installed. The worm can also infect computers running other versions of Windows operating systems if it is delivered through e-mail, instant messaging, or some other means.

Win32/Parite is a polymorphic file infecting virus that infects all portable EXE and SCR files found on local and shared network drives.

Worm:Win32/Stration.X is a mass-mailing email worm that sends itself to addresses obtained from a wide range of file types found on the infected system. The e-mail message composed by the worm may masquerade as a failure message or as a scanning tool. Worm:Win32/Stration.X also acts as a Trojan downloader, attempting to download a file from a remote website. The downloaded file is typically another variant of the Win32/Stration family.

Worm:Win32/Scrimge.B is a worm that spreads via MSN Messenger. It also contains backdoor functionality that allows unauthorized access to the affected machine.

Worm:Win32/Brontok.BU@mm is a mass-mailing e-mail worm that spreads by sending a copy of itself as an e-mail attachment to e-mail addresses that it gathers from files on the infected computer. Worm:Win32/Brontok.BU@mm can also copy itself to USB and pen drives. This worm can disable antivirus and security software, immediately terminate certain applications, and cause Windows to restart immediately when certain applications run. This worm may conduct denial of service (DoS) attacks against certain Web sites.

Worm:Win32/Mytob.W@mm is a worm that spreads via email, via exploit of a Windows vulnerability, and via MSN or Windows messenger. The worm also contains backdoor functionality that allows unauthorized access to an affected machine.