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Backdoor.Win32.RemoteManipulator.fdo Insecure Permissions

Backdoor.Win32.RemoteManipulator.fdo Insecure Permissions
Posted Mar 1, 2021
Authored by malvuln | Site malvuln.com

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

tags | exploit
systems | windows
MD5 | 170a73b9758d66901b465b56ab98be6d

Backdoor.Win32.RemoteManipulator.fdo Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/66ef21e8d1cf30dce6e084a9e306c18f.txt
Contact: malvuln13@gmail.com
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


Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).
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