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Backdoor.Win32.Buterat.cxq / Insecure Permissions EoP

CVE Category Price Severity
N/A CWE-276 N/A Critical
Author Risk Exploitation Type Date
N/A High Local 2021-02-12
CPE
cpe:cpe:/o:microsoft:windows
CVSS EPSS EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021020063

Below is a copy:

Backdoor.Win32.Buterat.cxq / Insecure Permissions EoP
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8bfac1f52a94f36b711e20bce30161cc.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Buterat.cxq
Vulnerability: Insecure Permissions EoP
Description: This malware creates an insecure dir under c:\ drive named "process", where it drops a random named executable and later moves it to C:\Users\[VICTIM]\AppData\Local\Temp where it sends SYN packets to TCP port 3000. The process dir grants change (C) permissions to the authenticated users group. 
Type: PE32
MD5: 8bfac1f52a94f36b711e20bce30161cc
Vuln ID: MVID-2021-0063
Dropped files: 
Disclosure: 02/01/2021


Exploit/PoC:
C:\Users\[VICTIM]\Desktop>cacls \process
C:\process BUILTIN\Administrators:(OI)(CI)(ID)F
           NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
           BUILTIN\Users:(OI)(CI)(ID)R
           NT AUTHORITY\Authenticated Users:(ID)C
           NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C


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