Saturday, February 27, 2021

Trojan.Win32.Hotkeychick.am Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/5ea9840970e78188f73eb1763363eeac.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan.Win32.Hotkeychick.am
Vulnerability: Insecure Permissions
Description: The trojan creates an insecure dir named "Korektor_MPiPS-01" under c:\ drive, granting change (C) permissions to the authenticated user group. Standard users can rename the malware and reboot to disable it or replace with their own executable to escalate privileges when a privileged user logs on to the infected machine.
Type: PE32
MD5: 5ea9840970e78188f73eb1763363eeac
Vuln ID: MVID-2021-0114
Disclosure: 02/25/2015

Exploit/PoC:
C:\>cacls \Korektor_MPiPS-01
C:\Korektor_MPiPS-01 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 Korektor_MPiPS-01
Volume in drive C has no label.

Directory of C:\Korektor_MPiPS-01

02/25/2021 10:46 PM <DIR> .
02/25/2021 10:46 PM <DIR> ..
03/05/2019 12:09 PM 1,096,704 Asystent.exe
02/25/2021 10:46 PM 56 Asystent.ini
02/25/2021 10:46 PM <DIR> DBF
03/05/2019 12:07 PM 2,568 korektor_mpips-01.txt
10/29/2015 06:00 AM 55 korektor_mpips-01.URL
03/05/2019 12:09 PM 818,688 Statystyka MPiPS-01.xls
5 File(s) 1,918,071 bytes
3 Dir(s) 50,556,514,304 bytes free


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