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Date: Thu, 28 Jan 2021 22:57:23 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Packed.Win32.Katusha.o (Ransomeware) / Insecure Permissions EoP

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/e184abe44bec183a522d2c66bc3f90e0.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Packed.Win32.Katusha.o (Ransomeware)
Vulnerability: Insecure Permissions EoP
Description: The malware create two dirs, one of them under the users
home dir. The files dropped are hidden and can be viewed using dir /a
command. Then after about 35 secs locks the victims screen, issuing a
warning about pirated software and to pay in BTC. If not paid, a
warrant will be issued for arrest. However, the malware grants full
(F) permissions to everyone for the "bkkYoIYg" dir under that targets
users home dir.

C:\>cacls C:\Users\VICTIM\bkkYoIYg\BkkMEYcs.exe
C:\Users\VICTIM\bkkYoIYg\BkkMEYcs.exe No permissions are set. All user
have full control

Type: PE32
MD5: e184abe44bec183a522d2c66bc3f90e0
Vuln ID: MVID-2021-0061
Dropped files: BkkMEYcs.exe, BkkMEYcs, BkkMEYcs.inf,
C:\ProgramData\HcgIwoAM\DiAYIoQI.exe, DiAYIoQI.inf
Disclosure: 01/28/2021


Exploit/PoC:
1) switch user to standard user for PoC
2) open taskmgr kill the malware
3) now you are able to place any files under the vuln "bkkYoIYg" dir
under the privileged users home dir.


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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