Trojan.Win32.NanoBot.onh malware suffers from an insecure permissions vulnerability.
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/9fff4c02274c0162880844f27ff91407.txt
Contact: [email protected]
Vulnerability: Insecure Permissions
Description: NanoBot.onh creates an insecure dir named "AppData" under c: drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables 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. In this case the dropped file "amsiproxy.bat" is actually an PE32 executable as indicated by the presence of MZ header field and binary data.
Vuln ID: MVID-2021-0173
Dropped files: amsiproxy.bat (PE32)
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C
Volume in drive C has no label.
Directory of C:AppDataRegister-CimProvider
04/15/2021 10:50 PM 1,101,316 amsiproxy.bat
1 File(s) 1,101,316 bytes
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