Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/d859ba54086fd0313dc34b73b5b1eccb.txt
Contact: malvuln13@gmail.com
Media: twitter.co Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/d859ba54086fd0313dc34b73b5b1eccb.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Downloader.Win32.Small.ahlq
Vulnerability: Insecure Permissions
Description: the malware creates a directory with insecure permissions under c drive granting change (C) permissions to the authenticated user group. Standard users can rename the 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.
Family: Small
Type: PE32
MD5: d859ba54086fd0313dc34b73b5b1eccb
Vuln ID: MVID-2022-0567
Disclosure: 04/26/2022


Exploit/PoC:
C:>cacls Temp
C:Temp BUILTINAdministrators:(OI)(CI)(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(ID)F
BUILTINUsers:(OI)(CI)(ID)R
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C


C:>dir Temp
Volume in drive C has no label.

Directory of C:Temp

04/14/2022 04:03 AM 761,344 vjrgq12Server_Setup.exe
1 File(s) 761,344 bytes


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