Two nights ago I was in Android Studio when it started reporting errors saving a Java file. It created a temporary Java file, and when I restarted it, it appeared as if my workspace.xml file (part of the configurations) had been altered, and I had to regenerate it. I was not allowed to delete the temporary Java files, even when I opened file manager with administrator access. While trying to delete the file, I opened a power shell window, and decided to do the pending android studio updates. I let the computer do the updates over night, but I had to start the Intel Haxm Accelerator update the morning after. A couple of moments later Windows Command Processor asked to make changes to the computer. In this context there often appear such requests so I accepted it almost as a habit. It then extracted a package in about a second. This triggered an alarm in me, and I googled "Windows Command Processor" to find it being associated with viruses. I immediately ended the respective task in task manager. After a bit more reading I decided to turn off Wi-Fi as a precautionary measure. I did a full windows defender scan and as well as an offline scan. These returned no threats (and the full scan ran for many hours). Doing some more googling I didn't find any of the other symptoms others had mentioned such as the process running on startup, it imitating windows notifications or asking me to download other software. The computer has in fact been behaving normally. Except this morning the login screen went through some cycles of login screen -> grey screen - > white screen -> login screen. I would be somewhat hesitant to draw conclusions from the correlation between the Android Studio / login screen behavior and Windows Command Processor as sometimes abnormal things just happen, but I thought I should include it anyways.
I don't have any antivirus installed except for Windows Defender, but I do take security seriously, and check essentially all installs with virustotal.com. The only recent installs include Grammarly for Office (same day), LastPass, Google Backup and Sync and Origin (with SimCity 4) (all about a week or older). I technically didn't check these with virustotal.com as I trusted the sources. In addition I have been installing MiKTeX packages, but none on the day of the issue.
I have access to other computers so that I can install other antivirus scanners without turning on wifi, but googling similar issues have suggested that none of these checks have returned any threats. This googling has also returned various suggestions of what this possibly could be. All the way from rootkit to that it is just trying to make me install other other software. Am I infected? What should I do?
Despite what it may appear as, I am not particularly tech savvy, and don't really know what I'm doing, but I am very willing to learn.
All help is appreciated.
I have also had Git installed for my Android Studio Project but can't remember having linked Git to this Android Studio project, but gut was suddenly connected when I reopened it. Also, the temporary file was now deleted.
Also,I have no application called Windows Command Processor in programs and features installed, as others have reported.
I guess my real question really is if I am safe if I don't give it priveliges again and as I stopped the process very early?
Edited by HrFrosk, 02 September 2017 - 09:43 AM.