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Hacked PC - random sounds playing (sh.itjust.works)

submitted 3 days ago by LOLseas@sh.itjust.works to c/linux@programming.dev

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My fellow penguins,

I have been pwned. What started off as weeks of smiling everytime I heard a 7-10s soundbyte of Karma Factory's "Where Is My Mind" has now devolved into hearing dashes and dots (Morse Code) and my all-time favorite, a South Park S13: Dead Celebrities soundbyte of Ike's Dad saying, "Ike, we are sick of you talking about ghosts!"

It's getting old now.

I feel like these sounds should be grepable in some log somewhere, but I'm a neophyte to this. I've done a clean (secure wipe >> reinstall) already, the sounds returned not even a day later.

Distro is Debian Bookworm. So how do I find these soundbytes? And how do I overcome this persistence? UFW is blocking inbound connection attempts everyday, but the attacker already established a foothold.

Thank you in advance. LOLseas

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[–] Skyline969@lemmy.ca 15 points 3 days ago (2 children)

Where does the sound come from? Your headphones, speakers, etc. Does it ever happen when your machine is off? You mentioned you only have wired audio peripherals - perhaps someone is playing a prank on you and has connected some kind of device inline.

[–] frongt@lemmy.zip 15 points 3 days ago

Agreed. Persisting through a wipe and reinstall is extremely unlikely. That kind of persistence isn't used by people doing it for the lulz.

I'd definitely check for devices on the audio cable, suspicious USB devices, things like that. And we need more info about trying to isolate and identify the actual source of the sound itself (speakers, headphones, etc.)

Like you mentioned, if it happens even when the PC is off, then I'd look for some kind of annoyatron, not the PC.

[–] LOLseas@sh.itjust.works 7 points 3 days ago

I have an A/V Receiver that goes out to a 6.3mm/half-inch jack headphones, and I mostly listen through the 2-channel phones out. But sometimes I run my 5.1 surround sound. Does not happen when the PC is off. I checked all cables, everything seems in order. No tap.