Trojan.Win32.Bayrob.cgau malware suffers from an insecure permissions vulnerability that can allow for privilege escalation.
846139c1b2a63ba6cc03a4216d4531c4Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source: http://malvuln.com/advisory/099a169f81089dc493ea300ef0309f70.txt
Contact: [email protected]
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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