Trojan.Win32.Agent.hsm malware suffers from an insecure permissions vulnerability.
30fdf081c36736d3966de00b316db172Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/c58d5aecd223ac95ae5fab6dcd69e953.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Trojan.Win32.Agent.hsm
Vulnerability: Insecure Permissions
Description: Agent.hsm creates an insecure dir named "LOL" 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.
Type: PE32
MD5: c58d5aecd223ac95ae5fab6dcd69e953
Vuln ID: MVID-2021-0178
Dropped files: jah.exe
Disclosure: 04/18/2021
Exploit/PoC:
C:\>cacls LOL
C:\LOL 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 LOL
Volume in drive C has no label.
Directory of C:\LOL
12/30/2019 04:16 AM 45,056 jah.exe
1 File(s) 45,056 bytes
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 occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).