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Worm.Win32.Detnat.c Insecure Permissions

Worm.Win32.Detnat.c Insecure Permissions
Posted Mar 24, 2021
Authored by malvuln | Site malvuln.com

Worm.Win32.Detnat.c malware suffers from an insecure permissions vulnerability.

tags | exploit, worm
systems | windows
MD5 | 1cdc3c79c3abffd54884f2e0b259214a

Worm.Win32.Detnat.c Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8df7527bd3446b89298c9c750394e0b6.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Worm.Win32.Detnat.c
Vulnerability: Insecure Permissions
Description: Detnat.c creates a dir named "Recycled" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the "svch0st.exe" 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: 8df7527bd3446b89298c9c750394e0b6
Vuln ID: MVID-2021-0139
Dropped files: svch0st.exe
Disclosure: 03/23/2021

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

Directory of C:\Recycled

06/14/2012 06:15 PM 61,088 svch0st.exe


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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