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
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).
