Ransomware Builder Babuk / Insecure Permissions

[malvuln <malvuln13 () gmail com>]

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


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