Trojan-Spy.Win32.SpyEyes.elr / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/025d07f4610605031e501e6745d663aa.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.SpyEyes.elr
Vulnerability: Insecure Permissions 
Description: The malware creates an insecure hidden dir named "40404504504" under c:\ drive, 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: 025d07f4610605031e501e6745d663aa
Vuln ID: MVID-2021-0112
Dropped files: 40404504504.exe, config.bin
Disclosure: 02/25/2021

Exploit/PoC:
#include "stdio.h"
#include "windows.h"

void main(void){

    system("attrib -h C:\\40404504504\\40404504504.exe");
    system("RENAME C:\\40404504504\\40404504504.exe  13");

    puts("[+] Disabled by renaming C:\\40404504504\\40404504504.exe to 13 ...\n");

    puts("[+] Trojan-Spy.Win32.SpyEyes.elr PWNED!");
    puts("[+] MD5: 025d07f4610605031e501e6745d663aa");
    puts("[+] By Malvuln");
    system("pause");
}


C:\>cacls \40404504504
C:\40404504504 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:\40404504504>dir
 Volume in drive C has no label.

 Directory of C:\40404504504

02/10/2018  12:21 AM           111,616 40404504504.exe
02/25/2021  10:19 PM             8,056 config.bin
               2 File(s)        119,672 bytes


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