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Backdoor.Win32.Spirit.12.b / Insecure Permissions

CVE Category Price Severity
N/A CWE-270 $500 High
Author Risk Exploitation Type Date
Unknown Critical Remote 2021-05-25
CVSS EPSS EPSSP
Unavailable 0.0092 0.80082

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021050142

Below is a copy:

Backdoor.Win32.Spirit.12.b / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2bcd471d9dd0a8d6194f4112c2ee520f.txt
Contact: [email protected]
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


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