Potential ShellDispatch.DLL Sideloading

Hunt Hypothesis

Detects potential DLL sideloading of “ShellDispatch.dll”

Detection Rule

Sigma (Original)

title: Potential ShellDispatch.DLL Sideloading
id: 844f8eb2-610b-42c8-89a4-47596e089663
status: test
description: Detects potential DLL sideloading of "ShellDispatch.dll"
references:
    - https://www.hexacorn.com/blog/2023/06/07/this-lolbin-doesnt-exist/
author: X__Junior (Nextron Systems)
date: 2023-06-20
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith: '\ShellDispatch.dll'
    filter_main_legit_path:
        - ImageLoaded|contains|all:
              - ':\Users\'
              - '\AppData\Local\Temp\'
        - ImageLoaded|contains: ':\Windows\Temp\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Some installers may trigger some false positives
level: medium

KQL (Microsoft 365 Defender)

DeviceImageLoadEvents
| where FolderPath endswith "\\ShellDispatch.dll" and (not(((FolderPath contains ":\\Users\\" and FolderPath contains "\\AppData\\Local\\Temp\\") or FolderPath contains ":\\Windows\\Temp\\")))

Required Data Sources

False Positive Guidance

• Some installers may trigger some false positives

MITRE ATT&CK Context

• Tactic: Persistence
• Tactic: Privilege Escalation
• Tactic: Execution
• Technique: T1574.001 — T1574.001

References

• https://www.hexacorn.com/blog/2023/06/07/this-lolbin-doesnt-exist/
• SigmaHQ Rule