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Date: Wed, 16 Feb 2022 21:21:48 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Spy.Win32.Zbot.aawo.Zeus-Builder / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/fe0dacbc953d4301232b386fcb3afc23.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.Zbot.aawo.Zeus-Builder
Vulnerability: Insecure Permissions
Description: ZeuS Builder saves PE files to the c drive with insecure
permissions granting change (C) permissions to the authenticated user
group. Standard users can rename the executable dropped by the malware to
disable it or replace it with their own executable. Then wait for a
privileged user to logon to the infected machine to potentially escalate
privileges.
Type: PE32
MD5: fe0dacbc953d4301232b386fcb3afc23
Vuln ID: MVID-2022-0493
Disclosure: 02/16/2022

Exploit/PoC:
ZeuS Builder

Config and loader building

Loading config from file 'C:\Users\Victim\Desktop\config2.txt'...
Loading succeeded!
Building bot file...
botnet=test
timer_config=120000ms, 60000ms
timer_logs=120000ms, 60000ms
timer_stats=120000ms, 60000ms
url_config=http://192.168.1.100/web/cfg_test.bin
url_compip=http://myip.ru
encryption_key=OK
Build succeeded!

C:\>cacls ldr_test.exe
C:\ldr_test.exe BUILTIN\Administrators:(ID)F
                NT AUTHORITY\SYSTEM:(ID)F
                BUILTIN\Users:(ID)R
                NT AUTHORITY\Authenticated Users:(ID)C


C:\>dir ldr_test.exe
 Volume in drive C has no label.

 Directory of C:\

02/14/2022  03:19 AM            61,440 ldr_test.exe
               1 File(s)         61,440 bytes
               0 Dir(s)  26,621,710,336 bytes free


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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