Published Dec 23, 2010 | Updated Sep 15, 2017

Worm:Win32/Ainslot.A

Severe |Detected with Windows Defender Antivirus

Aliases: TROJ_GEN.UAE171Y (Trend Micro) Trojan.Win32.Swisyn.aedl (Kaspersky)

Summary

Windows Defender detects and removes this threat.

This worm can make changes to your PC's security settings and contact a remote host for further instructions.

Find out ways that malware can get on your PC.  

Use the following free  software to detect and remove this threat:Microsoft

You should also run a full scan. A full scan might find other hidden malware.

This threat tries to use the function to spread via removable drives, like flash drives. You can disable to prevent worms from spreading:Windows AutorunUSBAutorun

Remember to scan any removable or portable drives. If you have security software, see this topic on our software help page:Microsoft

This threat might add itself to your exception list. This means it can go online without being blocked. To remove it from the exception list, do the following:Windows Firewall 

For Windows 8 :

For Windows 7:

For :Windows Vista

For :Windows XP

You can also visit our  or search the for more help.advanced troubleshooting pageMicrosoft virus and malware community

If you’re using , see our .Windows XPWindows XP end of support page

Disable Autorun
Scan removable drives
Remove program exceptions in the firewall
Get more help
  1. Open by swiping in from the right edge of the screen, tapping (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking ), entering in the search box, tapping or clicking , and then tapping or clicking .Windows FirewallSearchSearchfirewallSettingsWindows Firewall
  2. In the left pane, tap or click .Allow an app or feature through Windows Firewall
  3. Tap or click . You might be asked for an admin password or to confirm your choice.Change settings
  4. Select the check box next to the app you want to allow, select the network types you want to allow communication on, and then click .OK
  1. Click , select , then .StartControl PanelSystem and Security
  2. Select .Windows Firewall
  3. On the menu on the left, select . If you're prompted, type the password or provide confirmation.Allow a program through Windows Firewall
  4. Click . If you're prompted, type the password or provide confirmation.Change Settings
  5. Select <program name> from the list of allowed programs and features. Click .Remove
  6. Click .OK
  1. Click , select , then .StartControl PanelSecurity Center
  2. On the menu on the left, select .Windows Firewall
  3. On the menu on the left, select . If you are prompted, type the password or provide confirmation.Allow a program through Windows Firewall
  4. Select <program name> from the list of allowed programs and features. Click .Delete
  5. Click .OK
  1. Use an administrator account to log on.
  2. Click , select , type , and then click .StartRunOKwscui.cpl
  3. In Windows Security Center, click .Windows Firewall
  4. On the Exceptions
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