Potential DLL Sideloading Via DeviceEnroller.EXE

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: @gott_cyber
Source: github.com/SigmaHQ/sigma

Detects the use of the PhoneDeepLink parameter to potentially sideload a DLL file that does not exist. This non-existent DLL file is named "ShellChromeAPI.dll". Adversaries can drop their own renamed DLL and execute it via DeviceEnroller.exe using this parameter

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1574.001` Hijack Execution Flow: DLL
Stealth	`T1574.001` Hijack Execution Flow: DLL

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Potential DLL Sideloading Via DeviceEnroller.EXE
id: e173ad47-4388-4012-ae62-bd13f71c18a8
related:
    - id: ee4c5d06-3abc-48cc-8885-77f1c20f4451
      type: similar
status: test
description: |
    Detects the use of the PhoneDeepLink parameter to potentially sideload a DLL file that does not exist. This non-existent DLL file is named "ShellChromeAPI.dll".
    Adversaries can drop their own renamed DLL and execute it via DeviceEnroller.exe using this parameter
references:
    - https://mobile.twitter.com/0gtweet/status/1564131230941122561
    - https://strontic.github.io/xcyclopedia/library/DeviceEnroller.exe-24BEF0D6B0ECED36BB41831759FDE18D.html
author: '@gott_cyber'
date: 2022-08-29
modified: 2023-02-04
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\deviceenroller.exe'
        - OriginalFileName: 'deviceenroller.exe'
    selection_cli:
        CommandLine|contains: '/PhoneDeepLink'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith: '\deviceenroller.exe'
    - OriginalFileName: 'deviceenroller.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains: '/PhoneDeepLink'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`/PhoneDeepLink`	`field:"CommandLine" kind:match value:"/PhoneDeepLink"`
`Image`	ends_with	`\deviceenroller.exe`	`field:"Image" kind:ends_with value:"\deviceenroller.exe"`
`OriginalFileName`	eq	`deviceenroller.exe`	`field:"OriginalFileName" kind:eq value:"deviceenroller.exe"`