Cisco Umbrella - access to personal network detected

cisco-umbrella-dns

Classification:

attack

Tactic:

TA0001-initial-access

Technique:

T1133-external-remote-services

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Goal

Detect allowed access to personal network through proxy.

Strategy

This rule monitors Cisco Umbrella proxy logs to determine when a host accesses content related to personal VPNs or dynamic and residential IPs, possibly indicating that a user has accessed their personal network.

Triage and response

  1. Assess whether the site identified in the logs is allowed according to the organization’s acceptable use policy.
  2. Contact the user associated with the device to determine if they actively browsed to the sites identified in the log.
  3. If users should not be accessing the site, block the URL via Cisco Umbrella.
  4. If required, begin your organization’s incident response process and investigate.