Published Aug 18, 2010 | Updated Sep 15, 2017

Worm:Win32/Visal.A

Severe |Detected with Windows Defender Antivirus

Aliases: Trojan.Win32.Swisyn.ajgd (Kaspersky) Win32/AutoRun.VB.SF (ESET) Trojan.Win32.Swisyn (Ikarus) W32/Autorun.worm.g (McAfee) WORM_AUTORUN.NAD (Trend Micro)

Summary

Windows Defender Antivirus detects and removes this threat.
 
This worm can modify system policies, delete files, and download other malware.
 
It can arrive on your PC attached to a spam email message, and install copies of itself in drives C: to H:, as well as in folders with certain names.
 

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

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

Disable Autorun

This threat tries to use the Windows Autorun function to spread via removable drives, such as USB flash drives. You can disable Autorun to prevent worms from spreading:

Scan removable drives

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

Get more help

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

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

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