Discovery / credits: Malvuln - (c) 2021  
Original source:  
Threat: Backdoor.Win32.GTbot.c  
Vulnerability: Insecure Permissions  
Description: GTbot creates an insecure dir called "WINNT" under c:\ drive and grants change permissions (C) to the authenticated user group. Standard users can rename the malware to disable it or replace with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.  
Type: PE32  
MD5: 8c2acfcc60dda52db9bd9a934284b673  
Vuln ID: MVID-2021-0122  
Dropped files: esman.exe, seman.exe  
Disclosure: 03/06/2021  
C:\>cacls WINNT  
C:\WINNT BUILTIN\Administrators:(OI)(CI)(ID)F  
NT AUTHORITY\Authenticated Users:(ID)C  
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C  
C:\>cd WINNT  
Volume in drive C has no label.  
Directory of C:\WINNT  
03/02/2021 07:44 K0L4B0R451 <DIR> SYSTEM32  
0 File(s) 0 bytes  
3 Dir(s) 57,185,968,128 bytes free  
Volume in drive C has no label.  
Directory of C:\WINNT\SYSTEM32  
04/26/2006 12:06 K0L4B0R451 33,100 esman.exe  
04/26/2006 12:07 K0L4B0R451 20,408 seman.exe  
2 File(s) 53,508 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) (TM).