HOW_DECRYPT, help needed

kpwll

I am usually very careful with the sites I use and haven't used any new or strange ones, so I don't know how but my laptop has become infected with this malware and all my files and folders are corrupted :mad:. I have done a recent back-up to an external hard drive but it is probably after the infection. I have run Malwarebytes and it found the problems, quarantined them and I deleted them.
I detected all the HOW_DECRYPT bits in every file and folder and deleted them one at a time. The problem is still there with my files being corrupted, nothing seems to fix it any advice for this would be great.

Will the infection have transferred to the external hard drive during the back-up?
If yes, will it corrupt the whole of the external back-up or just the last one?

If I have an older uncorrupted back-up on the external hard drive available for use, can I just manually delete all the corrupted files/folders on my laptop or do I have to do a factory reset?

I am not very techie minded so any/all solutions fit for a pc illiterate please.:o
Thanks.

closed

Doesn't look good, especially if you had the external drive attached since infection, but there is some hope:

http://www.bleepingcomputer.com/virus-removal/cryptorbit-ransomware-information

What type of backup did you have?

Don't attach the external drive whilst booted from windows.

The best protection from this sort of virus, is a read only backup on dvd, and/or a disk image backup (macrium free etc) on a clean drive, restored from boot cd.