Backdoor.Win32.Neakse.bit malware suffers from an insecure permissions vulnerability.
9ead3ac44ed6c17d914d36b4ab7b6698Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/20863ba09c31037b1b3220fc6da100e1.txt
Contact: [email protected]
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
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