Racy pictures are "involuntarily" downloaded to the picture file on our NAS with cookies and browser history recorded. Can my husband be saved by a virus, etc.?
"Opencandy" showed on virus scan - virus allowing ads. Downloaded pictures go back further than the stored history. Often, but not exclusively, the search history (in google only) contains a celebrity name followed by the word naked. Pictures are the same genre, though sites from which they come sometimes contain harder content. A couple videos have also showed up in the history that were "unwanted".
Chosen solution
If there a specific history item that points to one website, then it is possible that either someone typed it in, someone searched for it and did a bad job covering their tracks, re-opened it from history, or, maybe, a virus brought it up. However, viruses normally, if they do open porn like websites, will places icons on your desktop, and lots of links through your history as they bombard you with images. And if you are infected with that sort of virus, you normally will be able to tell quite easily that lots of things aren't right. But, I can't guarantee that there is no virus on your computer. But it does sound like someone typed it in.
If you want to chack for a virus, Download and Install MalwareBytes Anti-Malware, run a full Scan. http://www.malwarebytes.org/
Download and Run TDSSKiller http://support.kaspersky.com/faq/?qid=208283363
Download and Install Microsoft Security Essentials http://windows.microsoft.com/en-US/windows/products/security-essentials (not an official endorsement, but I personally recommend MSE as an awesome permanent anti-virus)
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Soooo, you found searches and saved pictures that go further back than your history is saved? A virus won't usually run Google searches, so I doubt that is the case, though sometimes they can bring porn onto a computer.
Just to be clear on what a virus, trojan, hacker, etc. may or may not be able to do, how likely might it be that something other than the user leave a single entry in the search history that points to a specific video within a specific site? When porn is brought to a computer by a virus or something like it, does it leave a single entry path in the history file? And if so, is it possible for the invader to not show up in a scan?
(I do know a user can bring the single entry forward to a new date by selecting it from history on a previous date, thus leaving all of the other search criteria behind at the previous date so the desired item shows up by itself in a single entry on the new date).
(I read about link pre-fetching, but that does not sound like it would be a culprit in any of these situations).
Chosen Solution
If there a specific history item that points to one website, then it is possible that either someone typed it in, someone searched for it and did a bad job covering their tracks, re-opened it from history, or, maybe, a virus brought it up. However, viruses normally, if they do open porn like websites, will places icons on your desktop, and lots of links through your history as they bombard you with images. And if you are infected with that sort of virus, you normally will be able to tell quite easily that lots of things aren't right. But, I can't guarantee that there is no virus on your computer. But it does sound like someone typed it in.
If you want to chack for a virus, Download and Install MalwareBytes Anti-Malware, run a full Scan. http://www.malwarebytes.org/
Download and Run TDSSKiller http://support.kaspersky.com/faq/?qid=208283363
Download and Install Microsoft Security Essentials http://windows.microsoft.com/en-US/windows/products/security-essentials (not an official endorsement, but I personally recommend MSE as an awesome permanent anti-virus)
Thank you, Tyler for your responses on both issues. They are very helpful.