Trojan.Win32.Bayrob.cgau / Insecure Permissions EoP (SYSTEM)

[malvuln <malvuln13 () gmail com>]

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