eventvwr.exe

  • File Path: C:\windows\system32\eventvwr.exe
  • Description: Event Viewer Snapin Launcher

Screenshot

eventvwr.exe

Hashes

Type Hash
MD5 0464030A3293F289612E6C24D173C11C
SHA1 7C4CD00BEE3CC7FA40241BD1E14DCCE46282EBBE
SHA256 C720C4ED36F041A76F70331BE3C2B3B98E1A7D31825D03F5A26E21BA73034B22
SHA384 D839B0645E2D069BE83A99D0E81BD28208E0FD9E528A9F8139947D7AE8E7CB12AEF42405677B834F896C02A2E9EBBA97
SHA512 84CADAE51BB0E7903947E6DD2F308146C35FE2179BF37327D2D52A6F7B6C0EFF911C0184ED4F210FEF00057A1B7B46EFE1381A1D89DF3C8C0EA22E2A88ADCBA7
SSDEEP 1536:+b6HYJ37B5IMfoJUhSU6nPlTggJ2oj71BgR/Vp8dY1g:+bNRv3lhzslTZJ9j7Heb8C1g

Signature

  • Status: The file C:\windows\system32\eventvwr.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: eventvwr.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.

File Similarity (ssdeep match)

File Score
C:\Windows\system32\eventvwr.exe 80
C:\Windows\system32\eventvwr.exe 79
C:\Windows\system32\eventvwr.exe 85
C:\WINDOWS\system32\eventvwr.exe 79
C:\WINDOWS\system32\eventvwr.exe 88
C:\Windows\system32\miguiresource.dll 50
C:\Windows\SysWOW64\eventvwr.exe 88
C:\WINDOWS\SysWOW64\eventvwr.exe 83
C:\windows\SysWOW64\eventvwr.exe 86
C:\Windows\SysWOW64\eventvwr.exe 83
C:\Windows\SysWOW64\eventvwr.exe 83
C:\WINDOWS\SysWOW64\eventvwr.exe 80
C:\Windows\SysWOW64\miguiresource.dll 54

Possible Misuse

The following table contains possible examples of eventvwr.exe being misused. While eventvwr.exe is not inherently malicious, its legitimate functionality can be abused for malicious purposes.

Source Source File Example License
sigma proc_creation_win_sysmon_uac_bypass_eventvwr.yml - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/ DRL 1.0
sigma proc_creation_win_sysmon_uac_bypass_eventvwr.yml ParentImage\|endswith: '\eventvwr.exe' DRL 1.0
sigma proc_creation_win_task_folder_evasion.yml description: The Tasks folder in system32 and syswow64 are globally writable paths. Adversaries can take advantage of this and load or influence any script hosts or ANY .NET Application in Tasks to load and execute a custom assembly into cscript, wscript, regsvr32, mshta, eventvwr DRL 1.0
sigma proc_creation_win_uac_bypass_wmp.yml ParentCommandLine: '"C:\Windows\system32\mmc.exe" "C:\Windows\system32\eventvwr.msc" /s' DRL 1.0
sigma registry_event_bypass_uac_using_eventviewer.yml - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/ DRL 1.0
sigma registry_event_uac_bypass_eventvwr.yml - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/ DRL 1.0
LOLBAS Eventvwr.yml Name: Eventvwr.exe  
LOLBAS Eventvwr.yml - Command: eventvwr.exe  
LOLBAS Eventvwr.yml Description: During startup, eventvwr.exe checks the registry value HKCU\Software\Classes\mscfile\shell\open\command for the location of mmc.exe, which is used to open the eventvwr.msc saved console file. If the location of another binary or script is added to this registry value, it will be executed as a high-integrity process without a UAC prompt being displayed to the user.  
LOLBAS Eventvwr.yml - Path: C:\Windows\System32\eventvwr.exe  
LOLBAS Eventvwr.yml - Path: C:\Windows\SysWOW64\eventvwr.exe  
LOLBAS Eventvwr.yml - IOC: eventvwr.exe launching child process other than mmc.exe  
LOLBAS Eventvwr.yml - Link: https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/  
malware-ioc misp_invisimole.json "description": "Windows User Account Control (UAC) allows a program to elevate its privileges to perform a task under administrator-level permissions by prompting the user for confirmation. The impact to the user ranges from denying the operation under high enforcement to allowing the user to perform the action if they are in the local administrators group and click through the prompt or allowing them to enter an administrator password to complete the action. (Citation: TechNet How UAC Works)\n\nIf the UAC protection level of a computer is set to anything but the highest level, certain Windows programs are allowed to elevate privileges or execute some elevated COM objects without prompting the user through the UAC notification box. (Citation: TechNet Inside UAC) (Citation: MSDN COM Elevation) An example of this is use of rundll32.exe to load a specifically crafted DLL which loads an auto-elevated COM object and performs a file operation in a protected directory which would typically require elevated access. Malicious software may also be injected into a trusted process to gain elevated privileges without prompting a user. (Citation: Davidson Windows) Adversaries can use these techniques to elevate privileges to administrator if the target process is unprotected.\n\nMany methods have been discovered to bypass UAC. The Github readme page for UACMe contains an extensive list of methods (Citation: Github UACMe) that have been discovered and implemented within UACMe, but may not be a comprehensive list of bypasses. Additional bypass methods are regularly discovered and some used in the wild, such as:\n\n* <code>eventvwr.exe</code> can auto-elevate and execute a specified binary or script. (Citation: enigma0x3 Fileless UAC Bypass) (Citation: Fortinet Fareit)\n\nAnother bypass is possible through some Lateral Movement techniques if credentials for an account with administrator privileges are known, since UAC is a single system security mechanism, and the privilege or integrity of a process running on one system will be unknown on lateral systems and default to high integrity. (Citation: SANS UAC Bypass)", © ESET 2014-2018
malware-ioc misp_invisimole.json "https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/", © ESET 2014-2018
atomic-red-team T1548.002.md * eventvwr.exe can auto-elevate and execute a specified binary or script.(Citation: enigma0x3 Fileless UAC Bypass)(Citation: Fortinet Fareit) MIT License. © 2018 Red Canary
atomic-red-team T1548.002.md Bypasses User Account Control using Event Viewer and a relevant Windows Registry modification. More information here - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/ MIT License. © 2018 Red Canary
atomic-red-team T1548.002.md cmd.exe /c eventvwr.msc MIT License. © 2018 Red Canary
atomic-red-team T1548.002.md PowerShell code to bypass User Account Control using Event Viewer and a relevant Windows Registry modification. More information here - https://enigma0x3.net/2016/08/15/fileless-uac-bypass-using-eventvwr-exe-and-registry-hijacking/ MIT License. © 2018 Red Canary
atomic-red-team T1548.002.md Start-Process “C:\Windows\System32\eventvwr.msc” MIT License. © 2018 Red Canary
atomic-red-team T1574.012.md Write-Host “executing eventvwr.msc” -ForegroundColor Cyan MIT License. © 2018 Red Canary
atomic-red-team T1574.012.md START MMC.EXE EVENTVWR.MSC MIT License. © 2018 Red Canary
signature-base gen_cn_hacktools.yar $s12 = “eventvwr” fullword ascii CC BY-NC 4.0

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