Discovery / credits: Malvuln - (c) 2021  
Original source:  
Threat: Trojan.Win32.Bayrob.dtrg  
Vulnerability: Insecure Permissions   
Description: Bayrob.dtrg creates an insecure dir named "mnfqzckna0dkc" 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: 2f3f0e9be7edb73e545fc49b5a78b4f0   
Vuln ID: MVID-2021-0175  
Dropped files: fuwa2hvojto7lyc1nnmuov.exe, k2fyqvt.exe, pnhky9c.exe, stivbgcekgrl, oljlgxh, nxqdc3kf  
Disclosure: 04/17/2021  
C:\>cacls mnfqzckna0dkc  
C:\mnfqzckna0dkc BUILTIN\Administrators:(OI)(CI)(ID)F  
NT AUTHORITY\Authenticated Users:(ID)C  
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C  
C:\>dir /a mnfqzckna0dkc  
Volume in drive C has no label.  
Directory of C:\mnfqzckna0dkc  
04/12/2021 08:27 PM 205,824 fuwa2hvojto7lyc1nnmuov.exe  
04/12/2021 08:27 PM 205,824 k2fyqvt.exe  
04/12/2021 08:27 PM 0 nxqdc3kf  
04/12/2021 08:28 PM 4 oljlgxh  
04/12/2021 08:27 PM 205,824 pnhky9c.exe  
04/12/2021 08:27 PM 10 stivbgcekgrl  
6 File(s) 617,486 bytes  
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