Cmd Prompt Popping Up

sortajan

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For a week or two now, the command prompt occasionally pops up. I can't see any text printed in the half second it stays up, but if I'm running a fullscreen application it will minimize it and bring me to the desktop. I've run an Avast full system scan and a Malwarebytes Anti-Malware scan several times each, in safe mode and out of it, and neither of them have detected anything at all.

I don't know if it's happening hourly or every couple hours, but I recently noticed that it happens 58 minutes into the hour (10:58 PM being the most recent). It's definitely happening more than daily. I've checked through my installed programs and there's nothing out of the ordinary there (no malware, no bloatware, no dubious freeware, nothing illegal).

My computer is running as fast as ever, booting up perfectly. No passwords changed, no hiccups. It's just that blank black window keeps popping up.
 
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My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    PC/Desktop
    System Manufacturer/Model
    N/A
    CPU
    Intel Core i5-4690K
    Motherboard
    Asrock Z97 Extreme6
    Memory
    G.Skill Ares 8GB
    Graphics Card(s)
    EVGA GeForce GTX 770 4GB DC
    Sound Card
    N/A
    Monitor(s) Displays
    ASUS VG248
    Screen Resolution
    1920x1080
    Hard Drives
    SSD: Samsung 840 EVO 120GB // HDD: Seagate Barracuda 2TB 7200RPM
    PSU
    SeaSonic G 550W
    Case
    NZXT Source 210 Elite
    Cooling
    Stock cooling
    Keyboard
    Logitech K520
    Mouse
    SteelSeries Rival
    Internet Speed
    25Mbs Cable
    Browser
    Chrome
    Antivirus
    Avast! Internet Security
You could do the following to detect the invoker of the console:

  1. Download Process Monitor
  2. Run Process Monitor
  3. Add the following filters: Operation is "Process Start", Operation is "Process Create"
  4. Await a result including "conhost.exe"
 

My Computer

System One

  • OS
    Windows 8.1 Pro
    Computer type
    Laptop
    System Manufacturer/Model
    ThinkPad L540
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