Arbitrary File Download Via ConfigSecurityPolicy.EXE

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

Detects the execution of "ConfigSecurityPolicy.EXE", a binary part of Windows Defender used to manage settings in Windows Defender. Users can configure different pilot collections for each of the co-management workloads. It can be abused by attackers in order to upload or download files.

MITRE ATT&CK coverage

Tactic	Techniques
Exfiltration	`T1567` Exfiltration Over Web Service

Telemetry coverage

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

Rule body

title: Arbitrary File Download Via ConfigSecurityPolicy.EXE
id: 1f0f6176-6482-4027-b151-00071af39d7e
status: test
description: |
    Detects the execution of "ConfigSecurityPolicy.EXE", a binary part of Windows Defender used to manage settings in Windows Defender.
    Users can configure different pilot collections for each of the co-management workloads.
    It can be abused by attackers in order to upload or download files.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/ConfigSecurityPolicy/
author: frack113
date: 2021-11-26
modified: 2022-05-16
tags:
    - attack.exfiltration
    - attack.t1567
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - CommandLine|contains: ConfigSecurityPolicy.exe
        - Image|endswith: '\ConfigSecurityPolicy.exe'
        - OriginalFileName: 'ConfigSecurityPolicy.exe'
    selection_url:
        CommandLine|contains:
            - 'ftp://'
            - 'http://'
            - 'https://'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - CommandLine|contains: ConfigSecurityPolicy.exe
    - Image|endswith: '\ConfigSecurityPolicy.exe'
    - OriginalFileName: 'ConfigSecurityPolicy.exe'

Stage 2: `selection_url`

selection_url:
    CommandLine|contains:
        - 'ftp://'
        - 'http://'
        - 'https://'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`ConfigSecurityPolicy.exe` `ftp://` corpus 13 (sigma 11, elastic 1, kusto 1) `http://` corpus 23 (sigma 18, elastic 2, kusto 2, splunk 1) `https://` corpus 23 (sigma 18, elastic 2, kusto 2, splunk 1)	`field:"CommandLine" kind:match`
`Image`	ends_with	`\ConfigSecurityPolicy.exe`	`field:"Image" kind:ends_with value:"\ConfigSecurityPolicy.exe"`
`OriginalFileName`	eq	`ConfigSecurityPolicy.exe`	`field:"OriginalFileName" kind:eq value:"ConfigSecurityPolicy.exe"`