full-disclosure - [FD] Trojan.Win32.Hotkeychick.am / Insecure Permissions

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Message-ID: <CAAHK0WS2OZbzo=7ej+de9SsL2+_KJODQwfv109WDJEPC+pg50A@mail.gmail.com>
Date: Thu, 25 Feb 2021 23:13:04 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Hotkeychick.am / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/5ea9840970e78188f73eb1763363eeac.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Hotkeychick.am
Vulnerability: Insecure Permissions
Description: The trojan creates an insecure dir named "Korektor_MPiPS-01"
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: 5ea9840970e78188f73eb1763363eeac
Vuln ID: MVID-2021-0114
Disclosure: 02/25/2015

Exploit/PoC:
C:\>cacls \Korektor_MPiPS-01
C:\Korektor_MPiPS-01 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 Korektor_MPiPS-01
 Volume in drive C has no label.

 Directory of C:\Korektor_MPiPS-01

02/25/2021  10:46 PM    <DIR>          .
02/25/2021  10:46 PM    <DIR>          ..
03/05/2019  12:09 PM         1,096,704 Asystent.exe
02/25/2021  10:46 PM                56 Asystent.ini
02/25/2021  10:46 PM    <DIR>          DBF
03/05/2019  12:07 PM             2,568 korektor_mpips-01.txt
10/29/2015  06:00 AM                55 korektor_mpips-01.URL
03/05/2019  12:09 PM           818,688 Statystyka MPiPS-01.xls
               5 File(s)      1,918,071 bytes
               3 Dir(s)  50,556,514,304 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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