Trojan-Dropper.Win32.Dycler.vrp Insecure Permissions exploit

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## https://sploitus.com/exploit?id=PACKETSTORM:162355 Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/1d6d6d3c077250b7b3ad053e71054ecc.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Trojan-Dropper.Win32.Dycler.vrp Vulnerability: Insecure Permissions Description: The malware creates an insecure dir named "Drivers" 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: 1d6d6d3c077250b7b3ad053e71054ecc Vuln ID: MVID-2021-0186 Dropped files: dlhost.exe, hgo.bat Disclosure: 04/27/2021 Exploit/PoC: C:\>cacls Drivers C:\Drivers BUILTIN\Administrators:(OI)(CI)(ID)F NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F BUILTIN\Users:(OI)(CI)(ID)R NT AUTHORITY\Authenticated Users:(ID)C NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C C:\Drivers>attrib -s -h symbols C:\Drivers>dir symbols Volume in drive C has no label.F Directory of C:\Drivers\symbols 10/13/2011 09:50 AM 1,710,592 dlhost.exe 10/13/2011 09:52 AM 79 hgo.bat 04/26/2021 08:36 PM <DIR> Microsoft.VC90.CRT 2 File(s) 1,710,671 bytes 3 Dir(s) 6,918,037,504 bytes free 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) Malvuln.com (TM).