提出 #5031: BACKDOOR.WIN32.REMOTEMANIPULATOR / Insecure Permissions

Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source: http://malvuln.com/advisory/82183b3d85311a39fb80ae07357594e5.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: BACKDOOR.WIN32.REMOTEMANIPULATOR
Vulnerability: Insecure Permissions
Description: Creates a dir Folder139 with insecure permissions as it hands authenticated users change permissions (C). The backdoor drops an EXE named audiohd.exe which is not visible unless viewing using dir /a command. There we find the exeuctable audiohd.exe and another hidden DLL vp8encoder.dll

Type: PE32
MD5: 82183b3d85311a39fb80ae07357594e5
Vuln ID: MVID-2021-0005
Dropped files: audiohd.exe, vp8encoder.dll
Disclosure: 01/02/2021

Exploit/PoC:
C:\>cacls C:\Folder139
C:\Folder139 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:\Folder139>dir /a

02/15/2017 09:51 AM 1,486,848 audiohd.exe
07/15/2015 08:19 PM 607,440 vp8encoder.dll

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 occuring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).

• ソース: ⚠️ http://malvuln.com/advisory/82183b3d85311a39fb80ae07357594e5.txt
• ユーザー: malvuln (UID 14984)
• 送信: 2021年01月03日 00:08 (5 年 ago)
• モデレーション: 2021年01月03日 09:03 (9 hours later)
• ステータス: 承諾済み
• VulDBエントリ: 167214 [Backdoor:Win32/RemoteManipulator audiohd.exe 特権昇格]
• ポイント: 20