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

Discovery / credits: Malvuln - (c) 2021
Original source:

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

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.

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