deploying-edr-agent-with-crowdstrike

Deploys and configures CrowdStrike Falcon EDR agents across enterprise endpoints to enable real-time threat detection, behavioral analysis, and automated response. Use when onboarding endpoints to EDR coverage, configuring detection policies, or integrating Falcon telemetry with SIEM platforms. Activates for requests involving CrowdStrike deployment, Falcon sensor installation, EDR policy configuration, or endpoint detection and response.

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リポジトリ: xalgord/xalgorix
ソースの最終更新活動: 2026年6月6日 16:41
検出された SKILL.md の言語: 英語
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name	deploying-edr-agent-with-crowdstrike
description	Deploys and configures CrowdStrike Falcon EDR agents across enterprise endpoints to enable real-time threat detection, behavioral analysis, and automated response. Use when onboarding endpoints to EDR coverage, configuring detection policies, or integrating Falcon telemetry with SIEM platforms. Activates for requests involving CrowdStrike deployment, Falcon sensor installation, EDR policy configuration, or endpoint detection and response.
domain	cybersecurity
subdomain	endpoint-security
tags	["endpoint","edr","CrowdStrike","Falcon","threat-detection","sensor-deployment"]
version	1.0.0
author	mahipal
license	Apache-2.0
nist_ai_rmf	["GOVERN-1.1","MEASURE-2.7","MANAGE-3.1","MAP-5.1","MANAGE-2.4"]
atlas_techniques	["AML.T0070","AML.T0066","AML.T0082"]
nist_csf	["PR.PS-01","PR.PS-02","DE.CM-01","PR.IR-01"]

Deploying EDR Agent with CrowdStrike

When to Use

Use this skill when:

Deploying CrowdStrike Falcon sensors to Windows, macOS, or Linux endpoints
Configuring Falcon prevention and detection policies for different endpoint groups
Integrating CrowdStrike telemetry with SIEM (Splunk, Elastic, Sentinel) for correlated detection
Troubleshooting sensor connectivity, performance, or detection issues

Do not use this skill for deploying other EDR solutions (Carbon Black, SentinelOne) or for Falcon cloud workload protection (use cloud-specific deployment guides).

Common Misconfigurations & Verification

Prevention policy in detect-only: a host can be Online yet have every Prevention toggle off (Falcon ships detection-only by default). In Host Management confirm the assigned Prevention policy has Behavioral Protection / Next-Gen AV / Malware Protection set to Block (not just Detect), or malware is alerted on but never stopped.
Sensor in Reduced Functionality Mode: falconctl -g --rfm-state must return rfm-state=false. RFM (kernel/cloud mismatch after an OS update) leaves the sensor present but blind.
Host parked in the default policy group: sensor grouping tags (/install ... GROUPING_TAGS="..." or falconctl -s --tags=) must match the assignment rules, or the endpoint silently inherits the permissive default policy instead of the workstation/server policy.
Over-broad exclusions: review Configuration → Exclusions; ML/sensor-visibility wildcards like C:\* or whole-drive paths disable IOAs in those paths.
Verify with a real test: run CsTestDetect.exe (or Atomic Red Team T1059) and confirm a detection appears in the console within ~60s AND streams to your SIEM via the Event Streams TA / FDR. No SIEM event means telemetry is deployed but not integrated.

Prerequisites

CrowdStrike Falcon console access with Falcon Administrator role
Customer ID (CID) and Falcon sensor installer package
Administrative/root access on target endpoints
Network access: endpoints must reach CrowdStrike cloud (ts01-b.cloudsink.net on port 443)
Deployment tool: SCCM, Intune, GPO, Ansible, or manual installation

Workflow

Step 1: Obtain Falcon Sensor Installer and CID

1. Log into Falcon Console: https://falcon.crowdstrike.com
2. Navigate: Host setup and management → Sensor downloads
3. Download the appropriate installer:
   - Windows: WindowsSensor_<version>.exe
   - macOS: FalconSensorMacOS_<version>.pkg
   - Linux: falcon-sensor_<version>_amd64.deb / .rpm
4. Copy the Customer ID (CID) from the Sensor downloads page
   - CID format: <32-char-hex>-<2-char-checksum>

WindowsSensor_7.18.17106.exe /install /quiet /norestart CID=<YOUR_CID>

1. Create an Application in SCCM
2. Deployment type: Script Installer
3. Install command: WindowsSensor_7.18.17106.exe /install /quiet /norestart CID=<CID>
4. Detection method: Registry key exists
   - HKLM\SYSTEM\CrowdStrike\{9b03c1d9-3138-44ed-9fae-d9f4c034b88d}\{16e0423f-7058-48c9-a204-725362b67639}\Default
5. Deploy to target collection
6. Deployment purpose: Required (for mandatory installation)

1. Navigate: Devices → Windows → Configuration profiles
2. Create Win32 app deployment
3. Upload .intunewin package (wrapped sensor installer)
4. Install command: WindowsSensor_7.18.17106.exe /install /quiet /norestart CID=<CID>
5. Detection rule: File exists C:\Windows\System32\drivers\CrowdStrike\csagent.sys
6. Assign to device group

# Create startup script that checks for existing installation
$sensorPath = "C:\Windows\System32\drivers\CrowdStrike\csagent.sys"
if (-not (Test-Path $sensorPath)) {
    Start-Process -FilePath "\\fileserver\CrowdStrike\WindowsSensor.exe" `
      -ArgumentList "/install /quiet /norestart CID=<CID>" -Wait
}

# Debian/Ubuntu
sudo dpkg -i falcon-sensor_7.18.0-17106_amd64.deb
sudo /opt/CrowdStrike/falconctl -s -f --cid=<YOUR_CID>
sudo systemctl start falcon-sensor
sudo systemctl enable falcon-sensor

# RHEL/CentOS
sudo yum install falcon-sensor-7.18.0-17106.el8.x86_64.rpm
sudo /opt/CrowdStrike/falconctl -s -f --cid=<YOUR_CID>
sudo systemctl start falcon-sensor
sudo systemctl enable falcon-sensor

# Verify sensor is running and connected
sudo /opt/CrowdStrike/falconctl -g --rfm-state
# Expected output: rfm-state=false (sensor is communicating with cloud)

# Install sensor package
sudo installer -pkg FalconSensorMacOS_7.18.pkg -target /

# Set CID
sudo /Applications/Falcon.app/Contents/Resources/falconctl license <YOUR_CID>

# Grant Full Disk Access and System Extension via MDM profile
# Required for macOS Ventura+ (manual approval or MDM PPPC profile)
# MDM payload: com.crowdstrike.falcon.Agent → SystemExtension + Full Disk Access

# Verify sensor status
sudo /Applications/Falcon.app/Contents/Resources/falconctl stats

Machine Learning:
  - Cloud ML: Aggressive (extra protection, may increase false positives)
  - Sensor ML: Moderate
  - Adware & PUP: Moderate

Behavioral Protection:
  - On Write: Enabled (detect malware on file creation)
  - On Sensor ML: Enabled
  - Interpreter-Only: Enabled (detect script-based attacks)

Exploit Mitigation:
  - Exploit behavior protection: Enabled
  - Memory scanning: Enabled (detects in-memory attacks)
  - Code injection: Enabled

Ransomware:
  - Ransomware protection: Enabled
  - Shadow copy protection: Enabled
  - MBR protection: Enabled

Real-Time Response:
  - Enable RTR for all sensor groups
  - Configure RTR admin vs. RTR responder roles
  - Enable script execution (for IR teams)
  - Enable file extraction (for forensics)

Network Containment:
  - Pre-authorize containment for specific host groups
  - Configure containment exclusions (allow management traffic)

Automated Response:
  - Enable automated remediation for high-confidence detections
  - Configure kill process action for ransomware detections
  - Enable quarantine for malware file detections

# Windows: Check Falcon sensor status
sc query csagent
# Expected: RUNNING

# Check sensor version
reg query "HKLM\SYSTEM\CrowdStrike\{9b03c1d9-3138-44ed-9fae-d9f4c034b88d}\{16e0423f-7058-48c9-a204-725362b67639}\Default" /v AgentVersion

# Verify cloud connectivity
# In Falcon Console: Host Management → Hosts → search for hostname
# Status should show "Online" with last seen timestamp < 5 minutes

# CrowdStrike provides test detection samples
# Download CsTestDetect.exe from Falcon Console → Host setup
# Run on endpoint to generate a test detection
.\CsTestDetect.exe
# Verify detection appears in Falcon Console within 60 seconds

# Falcon SIEM Connector (Streaming API)
# Configure in Falcon Console: Support → API Clients and Keys

# Create API client with scope: Event Streams → Read
# Use falcon-siem-connector or Falcon Data Replicator (FDR)

# Splunk integration:
# Install CrowdStrike Falcon Event Streams Technical Add-on from Splunkbase
# Configure: Settings → Data inputs → CrowdStrike Falcon Event Streams
# Enter API Client ID and Secret
# Index: crowdstrike_events

# Elastic integration:
# Use Elastic Agent with CrowdStrike module
# Configure: Fleet → Agent policies → Add integration → CrowdStrike

Term	Definition
Falcon Sensor	Lightweight kernel-mode agent (25-30 MB) that collects endpoint telemetry and enforces prevention policies
CID (Customer ID)	Unique identifier that associates the sensor with your CrowdStrike Falcon tenant
RFM (Reduced Functionality Mode)	State where sensor operates with limited capability due to cloud connectivity loss
Sensor Grouping Tags	Labels applied during installation to auto-assign hosts to groups and policies
RTR (Real-Time Response)	Remote shell capability for incident responders to interact with endpoints through Falcon
IOA (Indicators of Attack)	Behavioral detections based on adversary techniques rather than static signatures