eventvwr.exe

  • File Path: C:\Windows\SysWOW64\eventvwr.exe
  • Description: Event Viewer Snapin Launcher

Screenshot

eventvwr.exe

Hashes

Type Hash
MD5 B16623FDB9C4EB80BEC647F082D34969
SHA1 4BF0E85C7D84894427864051D012D30D610E6348
SHA256 963E6A79B77518FA2D4E45604764A5065EB4563F7AF7D1526DAD76AED49CD96E
SHA384 A64A1B527D3268E91D7BE70794E07F2EA0E8D14A4E8945E9F05F85C921B2B00B5D5E6917146510F4A4694D811796F471
SHA512 169F7707283F1892D092F620755A4E9F21DA8796AF945D9EB65DD2B7730B7A41CF6E8A15019D5EBC7AE2A762E5BCAC9C03BD3094BCF6C261A515B153DB85CD90
SSDEEP 1536:MzS4hIMfoJUhSU6nPlTggJ2oj71BgR/Vp8dY1kEF:W3lhzslTZJ9j7Heb8C1k
IMP 6202C13AD7EF6559EA1F41430390B2E0
PESHA1 5A271F0C36E75AB154EF6C6407DB2F1632D7FEE8
PE256 1A21AD1A97FD1C026FF7AB3EF546DF116F4F4FC14722AE3F5CF6F14DA1CDB3D8

Runtime Data

Child Processes:

explorer.exe

Window Title:

Event Viewer

Open Handles:

Path Type
(R-D) C:\Windows\Fonts\StaticCache.dat File
(R-D) C:\Windows\SysWOW64\en-US\eventvwr.exe.mui File
(RW-) C:\Users\user File
(RW-) C:\Windows File
\BaseNamedObjects\C:*ProgramData*Microsoft*Windows*Caches*{6AF0698E-D558-4F6E-9B3C-3716689AF493}.2.ver0x0000000000000004.db Section
\BaseNamedObjects\C:*ProgramData*Microsoft*Windows*Caches*{DDF571F2-BE98-426D-8288-1A9A39C3FDA2}.2.ver0x0000000000000004.db Section
\BaseNamedObjects\C:*ProgramData*Microsoft*Windows*Caches*cversions.2.ro Section
\BaseNamedObjects\NLS_CodePage_1252_3_2_0_0 Section
\BaseNamedObjects\NLS_CodePage_437_3_2_0_0 Section
\Sessions\2\Windows\Theme2131664586 Section
\Windows\Theme966197582 Section

Loaded Modules:

Path
C:\Windows\SYSTEM32\ntdll.dll
C:\Windows\System32\wow64.dll
C:\Windows\System32\wow64cpu.dll
C:\Windows\System32\wow64win.dll
C:\Windows\SysWOW64\eventvwr.exe

Signature

  • Status: Signature verified.
  • Serial: 33000001C422B2F79B793DACB20000000001C4
  • Thumbprint: AE9C1AE54763822EEC42474983D8B635116C8452
  • 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: 10.0.17763.1 (WinBuild.160101.0800)
  • Product Version: 10.0.17763.1
  • Language: English (United States)
  • Legal Copyright: Microsoft Corporation. All rights reserved.
  • Machine Type: 32-bit

File Scan

  • VirusTotal Detections: 0/71
  • VirusTotal Link: https://www.virustotal.com/gui/file/963e6a79b77518fa2d4e45604764a5065eb4563f7af7d1526dad76aed49cd96e/detection/

File Similarity (ssdeep match)

File Score
C:\windows\system32\eventvwr.exe 83
C:\Windows\system32\eventvwr.exe 86
C:\Windows\system32\eventvwr.exe 83
C:\Windows\system32\eventvwr.exe 91
C:\WINDOWS\system32\eventvwr.exe 80
C:\WINDOWS\system32\eventvwr.exe 86
C:\Windows\system32\miguiresource.dll 54
C:\Windows\SysWOW64\eventvwr.exe 91
C:\WINDOWS\SysWOW64\eventvwr.exe 91
C:\windows\SysWOW64\eventvwr.exe 90
C:\Windows\SysWOW64\eventvwr.exe 91
C:\WINDOWS\SysWOW64\eventvwr.exe 86
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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