sigmamediumHunting

Arbitrary File Download Via MSOHTMED.EXE

Detects usage of "MSOHTMED" to download arbitrary files

MITRE ATT&CK

defense-evasionexecution

Detection Query

selection_img:
  - Image|endswith: \MSOHTMED.exe
  - OriginalFileName: MsoHtmEd.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/238/files

Tags

attack.defense-evasionattack.executionattack.t1218

Raw Content

title: Arbitrary File Download Via MSOHTMED.EXE
id: 459f2f98-397b-4a4a-9f47-6a5ec2f1c69d
status: test
description: Detects usage of "MSOHTMED" to download arbitrary files
references:
    - https://github.com/LOLBAS-Project/LOLBAS/pull/238/files
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-19
modified: 2023-11-09
tags:
    - attack.defense-evasion
    - attack.execution
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\MSOHTMED.exe'
        - OriginalFileName: 'MsoHtmEd.exe'
    selection_cli:
        CommandLine|contains:
            - 'ftp://'
            - 'http://'
            - 'https://'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium