Trojan-Dropper.Win32.Agent.xtp / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/360bbc9e0926488f085029948ff6c759.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Agent.xtp
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir named "remove" 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: 360bbc9e0926488f085029948ff6c759
Vuln ID: MVID-2021-0180
Disclosure: 04/21/2021


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

 Directory of C:\remove

04/20/2021  11:54 PM             5,090 clngbuster.reg
04/20/2021  11:54 PM               192 deleta.CMD
04/20/2021  11:54 PM               155 mata.CMD
04/20/2021  11:54 PM           146,232 movefile.exe
04/20/2021  11:54 PM           234,536 psexec.exe
04/20/2021  11:54 PM           187,184 pskill.exe
04/20/2021  11:54 PM               126 remove.CMD
04/20/2021  11:54 PM               237 removeGB.CMD
04/20/2021  11:54 PM           303,616 SetACL.exe
04/20/2021  11:54 PM             2,971 setreg.CMD
              10 File(s)        880,339 bytes



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