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TROJAN-DOWNLOADER.WIN32.VB.ABB / Insecure Permissions

CVE Category Price Severity
CWE-Other Unknown High
Author Risk Exploitation Type Date
Unknown High Local 2021-09-28
CPE
cpe:cpe:/a:trojan-downloader:win32:vb-abb: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 0

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021090138

Below is a copy:

TROJAN-DOWNLOADER.WIN32.VB.ABB / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8f81373b0f0e6f60206a1a707de2ed77.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan-Downloader.Win32.VB.abb
Vulnerability: Insecure Permissions
Description: The malware creates an executable with an ".axd" extension and insecure permissions under c:\ drive granting 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: 8f81373b0f0e6f60206a1a707de2ed77
Vuln ID: MVID-2021-0345
Dropped files: WINDOWSsystem32adoax.axd
Disclosure: 09/25/2021

Exploit/PoC:
C:\>cacls WINDOWSsystem32adoax.axd
C:\WINDOWSsystem32adoax.axd BUILTIN\Administrators:(ID)F
                            NT AUTHORITY\SYSTEM:(ID)F
                            BUILTIN\Users:(ID)R
                            NT AUTHORITY\Authenticated Users:(ID)C


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