Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/86e63bb63f3baf48ad3bf24c3f5b7e40.txt
Contact: malvul...@gmail.com
Media: twitter.com/malvuln
Threat: Trojan.Win32.Gentee.b
Vulnerability: Insecure Permissions EoP
Description: Trojan creates a vuln dir under c:\ drive named "WINNT",
granting change (C) permissions to the authenticated user group.
Type: PE32
MD5: 86e63bb63f3baf48ad3bf24c3f5b7e40
Vuln ID: MVID-2021-0072
Dropped files: kav31.exe, kav33.exe
Disclosure: 02/06/2021
Exploit/PoC:
C:\>cacls \WINNT
C:\WINNT 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
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