full-disclosure - [FD] Trojan-Spy.Win32.SpyEyes.elr / Insecure Permissions

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Message-ID: <CAAHK0WRxxOKpfXqv3ncyMOK1U51zT6FAhhOnTrETxuwhXEDk2A@mail.gmail.com>
Date: Thu, 25 Feb 2021 23:06:33 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Spy.Win32.SpyEyes.elr / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/025d07f4610605031e501e6745d663aa.txt
Contact: malvuln13@...il.com
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

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).

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