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Backdoor.Win32.Spirit.12.b Insecure Permissions

Backdoor.Win32.Spirit.12.b Insecure Permissions
Posted May 24, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.Spirit.12.b malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
MD5 | 23e8d96e7fa8dcf13e94ad19f51e7146

Backdoor.Win32.Spirit.12.b Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2bcd471d9dd0a8d6194f4112c2ee520f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Spirit.12.b
Vulnerability: Insecure Permissions
Description: Trojan Spirit 2001a 1.2 Fixed Edition by ThundeR GoD, creates an insecure dir named "Ts2k1a" 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: 2bcd471d9dd0a8d6194f4112c2ee520f
Vuln ID: MVID-2021-0223
Dropped files: client 1.2.exe, ip-check 1.2.exe, server 1.2.exe
Disclosure: 05/23/2021

Exploit/PoC:
C:\>dir \Ts2k1a
Volume in drive C has no label.

Directory of C:\Ts2k1a

05/12/2021 02:55 AM 257,024 client 1.2.exe
05/12/2021 02:55 AM 146,432 ip-check 1.2.exe
05/12/2021 02:55 AM 241,664 server 1.2.exe
3 File(s) 645,120 bytes

C:\>cacls Ts2k1a
C:\Ts2k1a 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


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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