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Backdoor.Win32.GTbot.c MVID-2021-0122 Insecure Permissions

Backdoor.Win32.GTbot.c MVID-2021-0122 Insecure Permissions
Posted Mar 8, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.GTbot.c malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
SHA-256 | c2e392c163ebcd9f435c3e09cca9331026106f4740cac625a4044fbdc756e045

Backdoor.Win32.GTbot.c MVID-2021-0122 Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8c2acfcc60dda52db9bd9a934284b673.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

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


Exploit/PoC:
C:\>cacls WINNT
C:\WINNT 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:\>cd WINNT

C:\WINNT>dir
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

C:\WINNT>cd SYSTEM32

C:\WINNT\SYSTEM32>dir
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) Malvuln.com (TM).
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