Trojan-Downloader.Win32.Delf.nzg Insecure Permissions

Trojan-Downloader.Win32.Delf.nzg malware suffers from an insecure permissions vulnerability.

MD5 | 09e6aa20c92b7757559ef3daea189a74

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Trojan-Downloader.Win32.Delf.nzg
Vulnerability: Insecure Permissions
Description: Win32.Delf.nzg creates an insecure dir named "Arquivos de Programas" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables dropped by the malware to disable it or replace it with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: 3c5c6f0f6f78af12d6b76119696a4074
Vuln ID: MVID-2021-0157
Dropped files: npdsplay2.dll, Update.exe
Disclosure: 04/01/2021

:\>cacls "Arquivos de Programas"
C:\Arquivos de Programas BUILTIN\Administrators:(OI)(CI)(ID)F
NT AUTHORITY\Authenticated Users:(ID)C
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

C:\>cd "Arquivos de Programas"

C:\Arquivos de Programas>dir "Windows Media Player"
Volume in drive C has no label.

Directory of C:\Arquivos de Programas\Windows Media Player

03/31/2021 08:49 PM 0 npdsplay2.dll
1 File(s) 0 bytes

C:\Arquivos de Programas>dir WindowsUpdate
Volume in drive C has no label.

Directory of C:\Arquivos de Programas\WindowsUpdate

03/31/2021 08:49 PM 198,144 Update.exe
1 File(s) 198,144 bytes

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).

Related Posts