HEUR.Backdoor.Win32.Winnti.gen Insecure Permissions

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

MD5 | 9c8490c9d481a6164d5d01e9ffadb0e5

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/eb272fe923ccf3e66fde1bf309cbc464.txt
Contact: [email protected]
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

C:\>cacls tmp
C:\tmp BUILTIN\Administrators:(OI)(CI)(ID)F
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

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