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HEUR.Backdoor.Win32.Winnti.gen Insecure Permissions

HEUR.Backdoor.Win32.Winnti.gen Insecure Permissions
Posted Jul 19, 2021
Authored by malvuln | Site malvuln.com

HEUR.Backdoor.Win32.Winnti.gen malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
MD5 | 9c8490c9d481a6164d5d01e9ffadb0e5

HEUR.Backdoor.Win32.Winnti.gen Insecure Permissions

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Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/eb272fe923ccf3e66fde1bf309cbc464.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: HEUR.Backdoor.Win32.Winnti.gen
Vulnerability: Insecure Permissions
Description: The malware creates a dir with insecure permissions under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executable 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: eb272fe923ccf3e66fde1bf309cbc464
Vuln ID: MVID-2021-0296
Disclosure: 07/18/2021


Exploit/PoC:
C:\>cacls tmp
C:\tmp 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 tmp
Volume in drive C has no label.

Directory of C:\tmp

07/13/2021 02:09 AM 77,224 DaumCleans.exe
1 File(s) 77,224 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).
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