userinit.exe
- File Path:
C:\windows\SysWOW64\userinit.exe - Description: Userinit Logon Application
Hashes
| Type | Hash |
|---|---|
| MD5 | D10643FC0095434C819316CA6CD748C0 |
| SHA1 | 88F690DB5C5AAFD7A3BE74A159C373A0A3A8DB3F |
| SHA256 | 0D392968DED34D674409A7A79FF6981990FA732A9E67A767CBEDC4C98A0D7CBE |
| SHA384 | EF392E2F1E59A8B1B3446DC470FD976B27A626841FF039D1C470A438759B036354A61FCE18A0B9D827C009B95F9AD3E9 |
| SHA512 | 87C8FF06267BFB528652FCF6E39B173D996A566D40E37682A038CD7D58EBFE92ADAD584A3F7D9E57CFEDDAB72B13F2BD4D822ABED94E2E4C0D709AFC84D36183 |
| SSDEEP | 384:Q7r+oSVIANEq/lToejcFIuGKXnfMXabOTI2WwymWCrem:i66Anl8ejqGKXnfMCBay |
Signature
- Status: The file C:\windows\SysWOW64\userinit.exe is not digitally signed. You cannot run this script on the current system. For more information about running scripts and setting execution policy, see about_Execution_Policies at http://go.microsoft.com/fwlink/?LinkID=135170
- Serial: ``
- Thumbprint: ``
- Issuer:
- Subject:
File Metadata
- Original Filename: USERINIT.EXE.MUI
- Product Name: Microsoft Windows Operating System
- Company Name: Microsoft Corporation
- File Version: 6.3.9600.16384 (winblue_rtm.130821-1623)
- Product Version: 6.3.9600.16384
- Language: English (United States)
- Legal Copyright: Microsoft Corporation. All rights reserved.
Possible Misuse
The following table contains possible examples of userinit.exe being misused. While userinit.exe is not inherently malicious, its legitimate functionality can be abused for malicious purposes.
| Source | Source File | Example | License |
|---|---|---|---|
| sigma | sysmon_suspicious_remote_thread.yml | - '\userinit.exe' |
DRL 1.0 |
| sigma | proc_creation_win_logon_scripts_userinitmprlogonscript_proc.yml | ParentImage\|endswith: '\userinit.exe' |
DRL 1.0 |
| sigma | proc_creation_win_susp_direct_asep_reg_keys_modification.yml | - '\software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit' |
DRL 1.0 |
| sigma | proc_creation_win_susp_userinit_child.yml | title: Suspicious Userinit Child Process |
DRL 1.0 |
| sigma | proc_creation_win_susp_userinit_child.yml | description: Detects a suspicious child process of userinit |
DRL 1.0 |
| sigma | proc_creation_win_susp_userinit_child.yml | ParentImage\|endswith: '\userinit.exe' |
DRL 1.0 |
| sigma | registry_event_asep_reg_keys_modification.yml | - '\Winlogon\Userinit' |
DRL 1.0 |
| sigma | registry_event_asep_reg_keys_modification_currentversion_nt.yml | - '\Winlogon\Userinit' |
DRL 1.0 |
| malware-ioc | misp_invisimole.json | "description": "Adding an entry to the \"run keys\" in the Registry or startup folder will cause the program referenced to be executed when a user logs in. (Citation: Microsoft Run Key) These programs will be executed under the context of the user and will have the account's associated permissions level.\n\nThe following run keys are created by default on Windows systems:\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Run</code>\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce</code>\n* <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Run</code>\n* <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnce</code>\n\nThe <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunOnceEx</code> is also available but is not created by default on Windows Vista and newer. Registry run key entries can reference programs directly or list them as a dependency. (Citation: Microsoft RunOnceEx APR 2018) For example, it is possible to load a DLL at logon using a \"Depend\" key with RunOnceEx: <code>reg add HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\RunOnceEx\\0001\\Depend /v 1 /d \"C:\\temp\\evil[.]dll\"</code> (Citation: Oddvar Moe RunOnceEx Mar 2018)\n\nThe following Registry keys can be used to set startup folder items for persistence:\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\User Shell Folders</code>\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders</code>\n* <code>HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders</code>\n* <code>HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\User Shell Folders</code>\n\nThe following Registry keys can control automatic startup of services during boot:\n* <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServicesOnce</code>\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServicesOnce</code>\n* <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServices</code>\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\RunServices</code>\n\nUsing policy settings to specify startup programs creates corresponding values in either of two Registry keys:\n* <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run</code>\n* <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run</code>\n\nThe Winlogon key controls actions that occur when a user logs on to a computer running Windows 7. Most of these actions are under the control of the operating system, but you can also add custom actions here. The <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Userinit</code> and <code>HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\Shell</code> subkeys can automatically launch programs.\n\nPrograms listed in the load value of the registry key <code>HKEY_CURRENT_USER\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Windows</code> run when any user logs on.\n\nBy default, the multistring BootExecute value of the registry key <code>HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Control\\Session Manager</code> is set to autocheck autochk *. This value causes Windows, at startup, to check the file-system integrity of the hard disks if the system has been shut down abnormally. Adversaries can add other programs or processes to this registry value which will automatically launch at boot.\n\n\nAdversaries can use these configuration locations to execute malware, such as remote access tools, to maintain persistence through system reboots. Adversaries may also use [Masquerading](https://attack.mitre.org/techniques/T1036) to make the Registry entries look as if they are associated with legitimate programs.", |
© ESET 2014-2018 |
| malware-ioc | part3.adoc | userinit.exe |
© ESET 2014-2018 |
| atomic-red-team | index.md | - Atomic Test #2: Winlogon Userinit Key Persistence - PowerShell [windows] | MIT License. © 2018 Red Canary |
| atomic-red-team | windows-index.md | - Atomic Test #2: Winlogon Userinit Key Persistence - PowerShell [windows] | MIT License. © 2018 Red Canary |
| atomic-red-team | T1012.md | reg query “HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit” | MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.001.md | The Winlogon key controls actions that occur when a user logs on to a computer running Windows 7. Most of these actions are under the control of the operating system, but you can also add custom actions here. The HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit and HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell subkeys can automatically launch programs. |
MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.004.md | * Winlogon\Userinit - points to userinit.exe, the user initialization program executed when a user logs on | MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.004.md | - Atomic Test #2 - Winlogon Userinit Key Persistence - PowerShell | MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.004.md | ## Atomic Test #2 - Winlogon Userinit Key Persistence - PowerShell | MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.004.md | PowerShell code to set Winlogon userinit key to execute a binary at logon along with userinit.exe. | MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.004.md | Set-ItemProperty “HKCU:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" “Userinit” “Userinit.exe, #{binary_to_execute}” -Force | MIT License. © 2018 Red Canary |
| atomic-red-team | T1547.004.md | Remove-ItemProperty -Path “HKCU:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name “Userinit” -Force -ErrorAction Ignore | MIT License. © 2018 Red Canary |
MIT License. Copyright (c) 2020-2021 Strontic.