Thank you for your time!
I read the instruction manual for FRST, ran FRST64 again in WinRE and came up with this fixlist.txt file:
() C:\Users\dad_user\AppData\Local\wdbmxno\wdbmxno.exe
() C:\Users\dad_user\AppData\Local\wdbmxno\aunvmxz.exe
HKLM-x32\...\Run: [] => [X]
GroupPolicy: Restriction ? <==== ATTENTION
HKLM\SYSTEM\CurrentControlSet\Services\mtrxnz <==== ATTENTION (Rootkit!)
R3 ilosvy; system32\drivers\osvybf.sys [X]
S1 luioc; \??\C:\Users\dad_user\AppData\Local\Temp\psdzcehv.sys [X] <==== ATTENTION
S4 pcmoztr; System32\drivers\sbbnvgwu.sys [X]
S3 ssswww; system32\drivers\jmmppp.sys [X]
2018-12-07 23:09 - 2018-12-07 23:09 - 000000022 _____ C:\WINDOWS\S.dirmngr
2018-12-07 23:08 - 2018-12-07 23:08 - 000145744 ____N C:\WINDOWS\system32\Drivers\weavybei.sys
2018-11-27 22:24 - 2018-12-03 11:21 - 000000000 ____D C:\Users\dad_user\AppData\Local\cwknrtp
2018-11-27 22:20 - 2018-12-08 10:34 - 000000000 ____D C:\Users\dad_user\AppData\Local\wdbmxno
2018-11-27 22:20 - 2018-11-27 22:20 - 000000000 ____D C:\Users\dad_user\AppData\Local\nvnkezr
2018-11-27 22:19 - 2018-11-27 22:22 - 000000000 ____D C:\WINDOWS\system32\pwacdis
2018-11-27 22:19 - 2018-11-27 22:19 - 000000000 ____D C:\WINDOWS\SysWOW64\pwacdis
2018-11-27 22:18 - 2018-11-27 22:18 - 000000000 ____D C:\ProgramData\LOIO
2018-11-27 22:18 - 2018-11-27 22:18 - 000000000 ____D C:\ProgramData\5QY37M5DZNTMW6GN449U
2018-11-27 22:13 - 2018-11-27 22:13 - 000000000 ____D C:\ProgramData\VVD
2018-11-27 22:13 - 2018-11-27 22:13 - 000000000 ____D C:\ProgramData\Bloger
C:\WINDOWS\system32\drivers\weavybei.sys -> Access Denied <======= ATTENTION
C:\Windows\System32\drivers\weaehlor.sys
After running a full scan on Malwarebytes, it found 4 threats (already quarantined by FRST).
No threats were detected in adwcleaner.
The virus doesn't appear in the task manager.
Thank you for your help!