Backdoor.Win32.RemoteManipulator.fdo malware suffers from an insecure permissions vulnerability.
170a73b9758d66901b465b56ab98be6dDiscovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/66ef21e8d1cf30dce6e084a9e306c18f.txt
Contact: [email protected]
Media: twitter.com/malvuln
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
Exploit/PoC:
C:\>cacls 4J83Z.tmp
C:\4J83Z.tmp BUILTIN\Administrators:(OI)(CI)(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
BUILTIN\Users:(OI)(CI)(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C
C:\>cd 4J83Z.tmp
C:\4J83Z.tmp>dir
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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