Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/20863ba09c31037b1b3220fc6da100e1.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Neakse.bit Vulnerability: Insecure Permissions Description: The malware creates two insecure dirs housing DLLs 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: 20863ba09c31037b1b3220fc6da100e1 Vuln ID: MVID-2021-0238 Disclosure: 06/06/2021 Exploit/PoC: C:\>cacls codecs C:\codecs 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:\>dir codecs Volume in drive C has no label. Directory of C:\codecs 04/06/2004 12:04 AM 548,919 colorcvt.dll 04/06/2004 12:05 AM 65,602 cook.dll 04/06/2004 12:07 AM 266,306 erv3.dll 04/06/2004 12:08 AM 479,298 erv4.dll 04/06/2004 12:05 AM 155,702 ralf.dll 04/06/2004 12:05 AM 102,465 sipr.dll 6 File(s) 1,618,292 bytes C:\>cacls common C:\common 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:\>dir common Volume in drive C has no label. Directory of C:\common 12/06/2002 02:02 PM 395,776 encn3260.dll 04/06/2004 12:08 AM 368,732 rembrdcst.dll 2 File(s) 764,508 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) Malvuln.com (TM).