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Trojan.Win32.Banpak.kh / Insecure Permissions

CVE Category Price Severity
N/A CWE-269 Not specified High
Author Risk Exploitation Type Date
Not specified High N/A 2021-06-24
CPE
cpe:cpe:/a:trojan-win32-banpak-kh:insecure-permissions
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-2021060134

Below is a copy:

Trojan.Win32.Banpak.kh / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/304fb160949dcaec3e718481464f9ce6.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan.Win32.Banpak.kh
Vulnerability: Insecure Permissions
Description: The malware creates a dir with insecure permissions under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executable dropped by the malware to disable it or replace it with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: 304fb160949dcaec3e718481464f9ce6
Vuln ID: MVID-2021-0258
Dropped files: taskhostoy.exe, vp8encoder.dll
Disclosure: 06/23/2021


Exploit/PoC:
C:\>cacls ZpaTo68.tmp
C:\ZpaTo68.tmp 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


C:\>dir /a ZpaTo68.tmp
 Volume in drive C has no label.

 Directory of C:\ZpaTo68.tmp

10/10/2017  04:44 AM         4,570,112 taskhostoy.exe
06/17/2021  2:33 AM         1,639,336 vp8encoder.dll
               2 File(s)      6,209,448 bytes


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