Key takeaway
Combine layered controls across data, users, devices and transfer channels with coordinated investigation and response.
Map the transfer paths
Personal email and cloud storage, FTP and third-party uploads, USB and other removable media are transfer paths. Overly privileged accounts are an enabling access risk rather than a transfer channel. Map assets, data owners and approved channels.
Investigate suspicious behaviour
Assess data sensitivity, user role, device, destination, volume and timing together. Unusual traffic is an investigation signal, not proof of theft. Consider legitimate work and many small transfers as well as a single large transfer.
Least privilege and approved channels
Classify data, grant only the access needed for work and control media and services. Agree monitoring and access rules within the organization and assign exception owners. Train staff on approved sharing and how to report suspected transfers.
Cloud, remote work and response planning
Identify approved services, log locations, exception owners and incident contacts in advance. Approved remote access is not itself an incident. Follow the agreed response process when a transfer is suspected; preserve evidence alongside containment where feasible without delaying urgent action.
Notify the response team
Report the suspected transfer and known context through an approved channel.
Limit further transfer
Authorized responders assess the situation and apply appropriate account, session, sharing or network restrictions.
Preserve evidence
Retain relevant logs, times, identifiers and action records through approved evidence handling.
Assess the impact
Determine affected data and recipients with the data owner, then decide follow-up through incident procedures.