Tuesday, September 28, 2021

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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