sigmamediumHunting

File Download Via InstallUtil.EXE

Detects use of .NET InstallUtil.exe in order to download arbitrary files. The files will be written to "%LOCALAPPDATA%\Microsoft\Windows\INetCache\IE\"

MITRE ATT&CK

T1218

defense-evasion

Detection Query

selection_img:
  - Image|endswith: \InstallUtil.exe
  - OriginalFileName: InstallUtil.exe
selection_cli:
  CommandLine|contains:
    - ftp://
    - http://
    - https://
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-08-19

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://github.com/LOLBAS-Project/LOLBAS/pull/239

Tags

attack.defense-evasionattack.t1218

Raw Content

title: File Download Via InstallUtil.EXE
id: 75edd216-1939-4c73-8d61-7f3a0d85b5cc
status: test
description: |
    Detects use of .NET InstallUtil.exe in order to download arbitrary files. The files will be written to "%LOCALAPPDATA%\Microsoft\Windows\INetCache\IE\"
references:
    - https://github.com/LOLBAS-Project/LOLBAS/pull/239
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-19
modified: 2023-11-09
tags:
    - attack.defense-evasion
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\InstallUtil.exe'
        - OriginalFileName: 'InstallUtil.exe'
    selection_cli:
        CommandLine|contains:
            - 'ftp://'
            - 'http://'
            - 'https://'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium