Trojan.Win32.Bayrob.cgau Insecure Permissions / Privilege Escalation

Trojan.Win32.Bayrob.cgau malware suffers from an insecure permissions vulnerability that can allow for privilege escalation.

MD5 | 846139c1b2a63ba6cc03a4216d4531c4

Discovery / credits: malvuln - (c) 2021
Original source:
Contact: [email protected]

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

C:\>cacls C:\chvlcpvyoh\oe9bd1ilk5mvicwmogzuzld.exe
C:\chvlcpvyoh\oe9bd1ilk5mvicwmogzuzld.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\Authenticated Users:(ID)C

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