Backdoor.Win32.RemoteManipulator.fdo / Insecure Permissions

CVE Category Price Severity
N/A CWE-284 N/A High
Author Risk Exploitation Type Date
Unknown High Remote 2021-03-01
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N 0.70029 0.972919

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

Backdoor.Win32.RemoteManipulator.fdo / Insecure Permissions
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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