about 10 computers on network have had their DNS changed

[sswats]

Currently have about 20 PCs on a network here in the office.They all have deep freeze so technically all the settings should be the same. They're all on DHCP so are assigned an address by the router.

But after some started losing net connection I checked the properties of the network connection and they had had a an IP address and a DNS number inputted.

Any ideas how that could happen?

 

[sswats]

I don't think it was done one by one basis.
Either through the network or through the internet.

Scanned individually for malware but nothing came up.

 

[sswats]

which scanner did you use?

And hwo did it get on multiple systems pretty much at the same time?