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Backdoor.Win32.Bifrose.ahyg MVID-2021-0356 Insecure Permissions

Backdoor.Win32.Bifrose.ahyg MVID-2021-0356 Insecure Permissions
Posted Oct 5, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.Bifrose.ahyg malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
SHA-256 | c604eb973000f6c7c25585d81cfcc24c3c17842121312fe4544ec74e724eca69

Backdoor.Win32.Bifrose.ahyg MVID-2021-0356 Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/d6aff119c03ff378d386b30b36b07a69.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Bifrose.ahyg
Vulnerability: Insecure Permissions
Description: The malware creates an dir with 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: d6aff119c03ff378d386b30b36b07a69
Vuln ID: MVID-2021-0356
Dropped files: vfenr522008a.exe
Disclosure: 10/04/2021

Exploit/PoC:
C:\>cacls Temp
C:\Temp 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 Temp
Volume in drive C has no label.

Directory of C:\Temp

10/03/2021 01:40 AM 689,664 vfenr522008a.exe
1 File(s) 689,664 bytes


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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