eventvwr.exe

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

Screenshot

eventvwr.exe

Hashes

Type Hash
MD5 16DF74906C84D249F47C3709F47DF6C3
SHA1 59261042EC9AC6995A074C164782559C48E1BCB2
SHA256 1501986365AE248C8E4998ECADD52F44ACF9E31D05FA10B0C324DC12D4A5C07E
SHA384 C4A2FD7E1BFC2D8C16C21BDD84C22F5FAABCCEB7EFFE20AD3FD9FA30A84DE95CC42A1F5E5033CB8A9B00F4D798AB791E
SHA512 C890DACC11422B9EA28C76A42D4E7506C6C1C2CDFF22FA8B76E8527D40E4BAB3FE01131FDBA34E8D73CCE9E326C3F7BA3A34340AA5C2ED4C670EF40F68213EAE
SSDEEP 1536:8T4XMjSj5IMfoJUhSU6nPlTggJ2oj71BgR/Vp8dY14:88Z3lhzslTZJ9j7Heb8C14

Runtime Data

Child Processes:

mmc.exe

Signature

  • Status: Signature verified.
  • Serial: 33000000BCE120FDD27CC8EE930000000000BC
  • Thumbprint: E85459B23C232DB3CB94C7A56D47678F58E8E51E
  • Issuer: CN=Microsoft Windows Production PCA 2011, O=Microsoft Corporation, L=Redmond, S=Washington, C=US
  • Subject: CN=Microsoft Windows, O=Microsoft Corporation, L=Redmond, S=Washington, C=US

File Metadata

  • Original Filename: eventvwr.exe.mui
  • Product Name: Microsoft Windows Operating System
  • Company Name: Microsoft Corporation
  • File Version: 10.0.14393.0 (rs1_release.160715-1616)
  • Product Version: 10.0.14393.0
  • 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 82
C:\Windows\system32\eventvwr.exe 83
C:\WINDOWS\system32\eventvwr.exe 80
C:\WINDOWS\system32\eventvwr.exe 83
C:\Windows\system32\miguiresource.dll 52
C:\Windows\SysWOW64\eventvwr.exe 86
C:\WINDOWS\SysWOW64\eventvwr.exe 86
C:\windows\SysWOW64\eventvwr.exe 85
C:\Windows\SysWOW64\eventvwr.exe 91
C:\Windows\SysWOW64\eventvwr.exe 86
C:\WINDOWS\SysWOW64\eventvwr.exe 83
C:\Windows\SysWOW64\miguiresource.dll 55

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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