Suspicious Camera and Microphone Access

Hunt Hypothesis

Detects Processes accessing the camera and microphone from suspicious folder

Detection Rule

Sigma (Original)

title: Suspicious Camera and Microphone Access
id: 62120148-6b7a-42be-8b91-271c04e281a3
status: test
description: Detects Processes accessing the camera and microphone from suspicious folder
references:
    - https://medium.com/@7a616368/can-you-track-processes-accessing-the-camera-and-microphone-7e6885b37072
author: Den Iuzvyk
date: 2020-06-07
modified: 2022-10-09
tags:
    - attack.collection
    - attack.t1125
    - attack.t1123
logsource:
    category: registry_event
    product: windows
detection:
    selection_1:
        TargetObject|contains|all:
            - '\Software\Microsoft\Windows\CurrentVersion\CapabilityAccessManager\ConsentStore\'
            - '\NonPackaged'
    selection_2:
        TargetObject|contains:
            - microphone
            - webcam
    selection_3:
        TargetObject|contains:
            - ':#Windows#Temp#'
            - ':#$Recycle.bin#'
            - ':#Temp#'
            - ':#Users#Public#'
            - ':#Users#Default#'
            - ':#Users#Desktop#'
    condition: all of selection_*
falsepositives:
    - Unlikely, there could be conferencing software running from a Temp folder accessing the devices
level: high

KQL (Azure Sentinel)

imRegistry
| where (RegistryKey endswith "\\Software\\Microsoft\\Windows\\CurrentVersion\\CapabilityAccessManager\\ConsentStore*" and RegistryKey contains "\\NonPackaged") and (RegistryKey contains "microphone" or RegistryKey contains "webcam") and (RegistryKey contains ":#Windows#Temp#" or RegistryKey contains ":#$Recycle.bin#" or RegistryKey contains ":#Temp#" or RegistryKey contains ":#Users#Public#" or RegistryKey contains ":#Users#Default#" or RegistryKey contains ":#Users#Desktop#")

KQL (Microsoft 365 Defender)

DeviceRegistryEvents
| where (RegistryKey endswith "\\Software\\Microsoft\\Windows\\CurrentVersion\\CapabilityAccessManager\\ConsentStore*" and RegistryKey contains "\\NonPackaged") and (RegistryKey contains "microphone" or RegistryKey contains "webcam") and (RegistryKey contains ":#Windows#Temp#" or RegistryKey contains ":#$Recycle.bin#" or RegistryKey contains ":#Temp#" or RegistryKey contains ":#Users#Public#" or RegistryKey contains ":#Users#Default#" or RegistryKey contains ":#Users#Desktop#")

Required Data Sources

False Positive Guidance

• Unlikely, there could be conferencing software running from a Temp folder accessing the devices

MITRE ATT&CK Context

• Tactic: Collection
• Technique: T1125 — T1125
• Technique: T1123 — T1123

References

• https://medium.com/@7a616368/can-you-track-processes-accessing-the-camera-and-microphone-7e6885b37072
• SigmaHQ Rule