full-disclosure - [FD] Trojan.Win32.Bayrob.cgau / Insecure Permissions EoP (SYSTEM)

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Message-ID: <CAAHK0WRCVT6xzoK=XrFOfDSV4bvoGM98m9tNsqQnBJZj6yW14g@mail.gmail.com>
Date: Sat, 2 Jan 2021 17:56:10 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Bayrob.cgau / Insecure Permissions EoP (SYSTEM)

Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source:
http://malvuln.com/advisory/099a169f81089dc493ea300ef0309f70.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Bayrob.cgau
Vulnerability: Insecure Permissions EoP (SYSTEM)
Description: Change permissions are granted to authenticated users on
the C:\chvlcpvyoh dir housing the malware running with SYSTEM
integrity. The trojan creates Windows Service named "Counter Locator
WLAN Controls", then drops a randomly named EXE to C:\chvlcpvyoh along
with an executable named "xvhjnn4.exe".

Type: PE32
MD5: 099a169f81089dc493ea300ef0309f70
Vuln ID: MVID-2021-0002
Dropped files: randomly-generated-name.exe, chvlcpvyoh.exe
Disclosure: 01/01/2021

Exploit/PoC:
C:\>cacls C:\chvlcpvyoh\oe9bd1ilk5mvicwmogzuzld.exe
C:\chvlcpvyoh\oe9bd1ilk5mvicwmogzuzld.exe BUILTIN\Administrators:(ID)F
                                          NT AUTHORITY\SYSTEM:(ID)F
                                          BUILTIN\Users:(ID)R
                                          NT AUTHORITY\Authenticated Users:(ID)C

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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 occuring from improper
Malware handling or the downloading of ANY Malware mentioned on this
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