sigmamediumHunting

Suspicious Execution of InstallUtil Without Log

Uses the .NET InstallUtil.exe application in order to execute image without log

Detection Query

selection:
  Image|endswith: \InstallUtil.exe
  Image|contains: Microsoft.NET\Framework
  CommandLine|contains|all:
    - "/logfile= "
    - /LogToConsole=false
condition: selection

Author

frack113

Created

2022-01-23

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasion

Raw Content

title: Suspicious Execution of InstallUtil Without Log
id: d042284c-a296-4988-9be5-f424fadcc28c
status: test
description: Uses the .NET InstallUtil.exe application in order to execute image without log
references:
    - https://securelist.com/moonbounce-the-dark-side-of-uefi-firmware/105468/
    - https://learn.microsoft.com/en-us/dotnet/framework/tools/installutil-exe-installer-tool
author: frack113
date: 2022-01-23
modified: 2022-02-04
tags:
    - attack.defense-evasion
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\InstallUtil.exe'
        Image|contains: 'Microsoft.NET\Framework'
        CommandLine|contains|all:
            - '/logfile= '
            - '/LogToConsole=false'
    condition: selection
falsepositives:
    - Unknown
level: medium