Windows 10: Random digital sounds, no malware or viruses detected

Greetings!

I've come here for help because Google has failed me, perhaps for the first time ever.

I have a new, custom built PC, with original Windows 10 installed. Avast Antivirus, Malwarebytes for anti-malware.

The issue is this: my PC makes random digital (as in like something being played, not static electricity or speakers malfunctioning) noises. These vary from a ''ka-chiing'' sound, a song going ''Hey ho, let's go'', ''Darkness'' (in a rather sinister voice, may I add) and others.

They appear randomly, although yesterday and today ''Darkness'' and ''Hey ho, let's go'' both appeared at approximately the same time as last night (midnight and 01:45, CET). I've ran several scans of both Avast and Malwarebytes, checked my running processes, checked my installed programs in the Control panel and found absolutely nothing. It's not websites, it's not applications I run myself. My best bet is a hidden virus/malware.

I don't really know where to turn and I'm afraid that there might be a more serious virus lying underneath. Even if there isn't, needless to say, hearing someone say ''Darkness'' very loudly in the middle of the night is just really unpleasant.

Any help would be greatly appreciated.

:)

 

Viruses and Malware

• Glossary of Malware Related Terms
• Malware, viruses, what are they? by Tigzy, Developer of RogueKiller
• Common Malware Types: Cybersecurity 101 for beginners
• Dialers, Trojans, Viruses, and Worms Oh My!

An anti-virus program alone does not provide comprehensive protection and cannot prevent, detect and remove all threats at any given time. Anti-virus software is
inherently reactive...meaning it usually finds malware after a computer has been infected. Further, if you're dealing with

zero-day malware it's unlikely the anti-virus is going to detect anything. Anti-virus and anti-malware programs each
perform different tasks as it relates to computer security and threat detection. Essentially, they look for and remove different types of malicious threats.

In simplistic terms, Anti-virus programs use massive databases with different scanning engines and detection methods to scan for infectious malware which includes

viruses,
worms,
Trojans,
rootkis and
bots.

Anti-malware programs use smaller databases and generally tend to focus more on
adware,
spyware,

unwanted toolbars,
browser hijackers,
potentially unwanted programs and
potentially unsafe applications.

Anti-virus and Anti-malware solutions with anti-exploitation
features protect against
zero-day malware,
drive-by downloads,
exploits and
Exploit Kits.

Therefore, you need both an anti-virus and an anti-malware solution for maximum protection.

Important Fact: Keep in mind that
the user is the first and last line of defense and security is a constant effort to stay one step ahead of the bad guys. No amount of security software is going to defend against today's sophisticated malware writers for those who do not practice
safe computing and stay informed. It has been proven time and again that the
user is a more substantial factor (weakest link)
in security than the architecture of the operating system or installed protection software.

Security begins with personal responsibility. Common sense, good security habits, safe surfing, understanding security and safe computing are essential to protecting yourself from malware infection.

• Answers to common security questions - Best Practices for Safe Computing

 

Malware Detected

If this is what you are seeing suggest you follow all
ofthe steps listed in this removal guide:
https://www.bleepingcomputer.com/virus-removal/remove-the-requested-resource-is-in-use-error/

Other scanners that may help resolve this malware issue are listed in
List of Malware Removal Tools

Regards…

Top 10 Ways PUPs Sneak Onto Your Computer. And How To Avoid Them.

 

What Are All the Programs I Need to Detect Viruses?


I got Windows Defender. Is this all I need to stop malware, viruses and spyware? If not what do you suggest?