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Backdoor.Win32.Bifrose.ahvb MVID-2021-0090 Insecure Permissions

Backdoor.Win32.Bifrose.ahvb MVID-2021-0090 Insecure Permissions
Posted Feb 16, 2021
Authored by malvuln | Site malvuln.com

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

tags | exploit
systems | windows
SHA-256 | bb9f15193f65ac95f44d88b0e2811648f4d5f5e78134baf5e273c723603eb732

Backdoor.Win32.Bifrose.ahvb MVID-2021-0090 Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/39e22b8b19f6aed59d2def00c4228d56.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Bifrose.ahvb
Vulnerability: Insecure Permissions
Description: The backdoor creates an insecure dir named "Temp" under c:\ drive, granting change (C) permissions to the authenticated user group.
Type: PE32
MD5: 39e22b8b19f6aed59d2def00c4228d56
Vuln ID: MVID-2021-0090
Dropped files: iwbfh482008c.exe
Disclosure: 02/15/2021

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

02/14/2021 10:01 PM <DIR> .
02/14/2021 10:01 PM <DIR> ..
02/14/2021 10:01 PM 689,664 iwbfh482008c.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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