Remote Management and Monitoring tool - NetSupport - Network Connection

Hunt Hypothesis

Remote Monitoring and Management (RMM) programs are IT to manage remote endpoints. Attackers have begun to abuse these programs to persist or provide C2 channels. https://github.com/jischell-msft/Remo

KQL Query

let Time_start = now(-5d);
let Time_end = now();
//
DeviceNetworkEvents
| where Timestamp between (Time_start..Time_end)
| where RemoteUrl has 'netsupportsoftware.com'
    and InitiatingProcessVersionInfoCompanyName has 'netsupport'
| summarize FirstSeen=min(Timestamp), LastSeen=max(Timestamp), 
    Report=make_set(ReportId), Count=count() by DeviceId, DeviceName,
    RemoteUrl 

Analytic Rule Definition

id: f19632db-9c3c-4141-8e58-32e34731a445
name: Remote Management and Monitoring tool - NetSupport - Network Connection
description: |
    Remote Monitoring and Management (RMM) programs are IT to manage remote endpoints. Attackers have begun to abuse these programs to persist or provide C2 channels.
    https://github.com/jischell-msft/RemoteManagementMonitoringTools
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceNetworkEvents
tactics: CommandAndControl
relevantTechniques: T1219
query: |
  let Time_start = now(-5d);
  let Time_end = now();
  //
  DeviceNetworkEvents
  | where Timestamp between (Time_start..Time_end)
  | where RemoteUrl has 'netsupportsoftware.com'
      and InitiatingProcessVersionInfoCompanyName has 'netsupport'
  | summarize FirstSeen=min(Timestamp), LastSeen=max(Timestamp), 
      Report=make_set(ReportId), Count=count() by DeviceId, DeviceName,
      RemoteUrl 

Required Data Sources

False Positive Guidance

• Scenario: Scheduled NetSupport maintenance tasks
  Description: IT admins use NetSupport to perform routine maintenance (e.g., patching, configuration updates) on endpoints. The tool’s legitimate update URLs (e.g., https://download.netsupportsoftware.com/update) may trigger the rule.

MITRE ATT&CK Context

• Tactic: CommandAndControl
• Technique: T1219 — T1219

References

• [Source Query](https://github.com/Azure/Azure-Sentinel/blob/main/Hunting Queries/Microsoft 365 Defender/RemoteManagementMonitoring/rmm_NetSupport_netconn.yaml)