Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/d58b1c2f540268bd9dd920455568d45f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.Stealer.osh
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir named "DESKTOP-2C3IQHO" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the malware and reboot to disable it or replace with their own executable to escalate privileges when a privileged user logs on to the infected machine.
Type: PE32
MD5: d58b1c2f540268bd9dd920455568d45f
Vuln ID: MVID-2021-0117
Dropped files: ApiSetHost.AppExecutionAlias.exe
Disclosure: 03/1/2021

Exploit/PoC:
C:\>cacls \DESKTOP-2C3IQHO\scp
C:\DESKTOP-2C3IQHO\scp 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 \DESKTOP-2C3IQHO\scp
 Volume in drive C has no label.

 Directory of C:\DESKTOP-2C3IQHO\scp

02/23/2021  07:41 PM         1,238,020 ApiSetHost.AppExecutionAlias.exe
               1 File(s)      1,238,020 bytes


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