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Date: Wed, 19 Jan 2022 22:06:47 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Ransomware Builder Babuk / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/5dfa998f62612e10d5d28d26948dd50f.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Ransomware Builder Babuk
Vulnerability: Insecure Permissions
Description: The malware creates directorys with insecure permissions when
write to 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: 5dfa998f62612e10d5d28d26948dd50f
Vuln ID: MVID-2022-0461
Disclosure: 01/19/2022


Exploit/PoC:
C:\>builder.exe
Usage: builder.exe FolderName

C:\>builder.exe c:\hate
Creating folder 'c:\hate'
curve25519 keys generated.
"c:\hate\e_win.exe" written!
"c:\hate\d_win.exe" written!
"c:\hate\e_esxi.out" written!
"c:\hate\d_esxi.out" written!
"c:\hate\e_nas_x86.out" written!
"c:\hate\d_nas_x86.out" written!
"c:\hate\e_nas_arm.out" written!
"c:\hate\d_nas_arm.out" written!
"c:\hate\kp.curve25519" written!
"c:\hate\ks.curve25519" written!
Press any key to continue . . .

C:\>cacls \hate
C:\hate 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


Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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