Backdoor.Win32.Azbreg.amw Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/5eb58198721d4ded363e41e243e685cc.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Azbreg.amw  
Vulnerability: Insecure Permissions   
Description: The backdoor creates an insecure hidden dir named "MSDCSC" granting 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: 5eb58198721d4ded363e41e243e685cc  
Vuln ID: MVID-2021-0113  
Dropped files: msdcsc.exe  
Disclosure: 02/25/2021  
  
  
Exploit/PoC:  
#include "windows.h"  
  
void main(void){  
  
system("attrib -h C:\\MSDCSC\\msdcsc.exe");  
system("RENAME C:\\MSDCSC\\msdcsc.exe 13");  
  
Sleep(1000);  
  
puts("[+] Disabled by renaming C:\\MSDCSC\\msdcsc.exe to 13 ...\n");  
  
Sleep(1000);  
  
puts("[+] Backdoor.Win32.Azbreg.amw PWNED!");  
puts("[+] MD5: 5eb58198721d4ded363e41e243e685cc");  
puts("[+] By Malvuln");  
system("pause");  
  
}  
  
C:\>cacls \MSDCSC  
C:\MSDCSC 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 /a \MSDCSC  
  
Directory of C:\MSDCSC  
  
07/13/2012 01:35 AM 755,712 msdcsc.exe  
1 File(s) 755,712 bytes  
  
  
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`