Backdoor.Win32.RemoteManipulator.fdo Insecure Permissions

Backdoor.Win32.RemoteManipulator.fdo malware suffers from an insecure permissions vulnerability.

MD5 | 170a73b9758d66901b465b56ab98be6d

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.RemoteManipulator.fdo
Vulnerability: Insecure Permissions
Description: The backdoor creates an insecure randomly named hidden dir with a .tmp ext E.g. 8RK86.tmp and grants change (C) permissions to the authenticated user group. Standard users can rename the malware and reboot to disable it or replace with their own executable to escalate privileges when a privileged user logs on to the infected machine.
Type: PE32
MD5: 66ef21e8d1cf30dce6e084a9e306c18f
Vuln ID: MVID-2021-0116
Dropped files: settings.dat, vp8encoder.dll, xpcomp.exe
Disclosure: 03/01/2021

C:\>cacls 4J83Z.tmp
C:\4J83Z.tmp BUILTIN\Administrators:(OI)(CI)(ID)F
NT AUTHORITY\Authenticated Users:(ID)C
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

C:\>cd 4J83Z.tmp

Volume in drive C has no label.

Directory of C:\4J83Z.tmp

File Not Found

C:\4J83Z.tmp>dir /a
Volume in drive C has no label.

Directory of C:\4J83Z.tmp

02/25/2021 05:55 PM 2,664 settings.dat
08/06/2017 06:51 AM 542,016 vp8encoder.dll
02/25/2021 05:55 PM 2,981,888 xpcomp.exe

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