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Randomly generating characters turned out not to be a virus

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Thomas Zucker-Scharff
Veteran in computer systems, malware removal and ransomware topics.  I have been working in the field since 1985.
It started not too long ago. It was at first annoying. My keystrokes seemed to be randomly generated, not the ones I typed on the keyboard. For some reason this only happened in certain applications (especially browsers such as IE11, Firefox and Chrome), but not in others and in some applications only when I typed too quickly. What was, I thought, the oddest part of the whole thing was that the characters were random, in that if I held down a key it would generate a succession of characters, all different, one of which would eventually be itself. Odd....

I was immediately suspicious. Could this be malware of some type? Maybe a keylogger? I am fairly strict when it comes to my production machine and what I allow on it. I have multilayered security installed and several protection apps that work together to protect me from all kinds of malware. So what was happening? I scanned with everything under the sun.
 
  1. Malwarebytes Pro (with rootkit detection on)
  2. Chameleon
  3. Superantispyware
  4. SpyDLLRemover/SpyBHORemover
  5. Antirootkit software 
    1. F-secure
    2. Sophos
    3. Panda (pavark)
    4. RootkitRevealer
And those were just the first 2 days. All my scans found absolutely nothing. I was frustrated and a little embarrassed that this had happened to me even though I had taken all the possible precautions (except those that involve running your system in a virtual environment, for which I don't have the resources to do all the time). I tested for traffic going both ways, but there was none and this happened even when my machine was disconnected from the internet entirely. I rebooted several times (I rarley reboot, so I thought this might help), to no avail. 

I made do with using another machine for a short time, but was not happy I could not solve my own problem. I started searching EE for an answer. It may be here somewhere, but I couldn't find it. So I started searching the Internet using google.com (googling). I eventually found an answer.

The Answer:

I thought this would be something complicated involving malware and a reformat of my computer, but it was far from that (although I may do the reformat anyway). In my searches I found the answer to be a simple set of keypresses. When I pressed Num Lock and Scroll Lock at the same time my keyboard stopped generating random characters and went back to outputting the characters I typed!

I would link to the page where I found the answer, but I can't find it again.
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