Intellectual property (IP) theft before employee resignation occurs when an employee deliberately collects, copies, or transfers proprietary organisational information before leaving a company. The information may include source code, product designs, research documents, customer databases, trade secrets, financial models, or confidential business strategies.

Employees often have legitimate access to these resources, making the activity difficult to distinguish from routine work. However, unusual bulk downloads, repository cloning, archive creation, external file transfers, and changes to access patterns can indicate potential data theft.

For SOC analysts, investigating suspected intellectual property theft requires correlating identity logs, endpoint telemetry, repository activity, cloud audit records, and network data. The objective is to establish what information was accessed, whether it was transferred outside authorised boundaries, and whether the evidence supports deliberate unauthorised activity.

Important: An employee downloading files before resignation is not, by itself, evidence of theft. Legitimate handovers, backups, and approved project transfers must be considered before drawing conclusions.

1. Introduction: When an Employee's Access Becomes a Risk

Organisations invest significant resources in developing intellectual property. Source code, proprietary algorithms, engineering designs, customer information, research findings, and internal business plans can provide a competitive advantage.

Employees may have legitimate access to this information because their roles require them to develop, maintain, or manage it.

The security challenge arises when that access is used for a purpose that the organisation has not authorised.

Consider a software engineer who has announced their resignation. During the following days, the engineer clones several internal repositories, downloads confidential design documents, and transfers selected files to a personal cloud-storage account.

Each individual action may be technically possible within the engineer's existing permissions. The concern emerges when the actions are correlated with the sensitivity of the files, the unusual volume of access, the external destination, and the absence of an approved business purpose.

For a SOC team, the investigation must establish the facts without assuming that an employee's impending departure proves malicious intent.

2. What Is Intellectual Property Theft?

Intellectual property theft involves the unauthorised acquisition, copying, disclosure, or use of information protected by an organisation's legal rights or confidentiality arrangements.

In a cybersecurity investigation, the term may cover the unauthorised transfer of proprietary digital assets, although the legal classification depends on the facts and applicable law.

Common types of information targeted

• Source code: Proprietary applications, internal libraries, and software development tools.

• Trade secrets: Confidential algorithms, formulas, manufacturing methods, and technical processes.

• Research and development: Experimental results, prototypes, engineering specifications, and product roadmaps.

• Customer information: Customer lists, account records, pricing agreements, and commercial relationships.

• Business strategy: Acquisition plans, confidential financial forecasts, and internal market analysis.

• Credentials and configuration data: API tokens, deployment credentials, infrastructure configurations, and secrets that could provide further access.

Not all confidential information is necessarily a trade secret or protected intellectual property. Investigators should record the information's classification and ownership rather than make unsupported legal conclusions.

3. Why the Period Before Resignation Matters

The period surrounding an employee's departure can create additional security and operational risks.

An employee may need to transfer project files, document ongoing work, or prepare a handover. These legitimate activities can resemble data collection.

At the same time, an individual intending to take proprietary information may attempt to collect it before access is revoked.

Behavioural indicators worth investigating

• A sudden increase in downloads of sensitive documents.

• Access to projects unrelated to the employee's responsibilities.

• Unusual cloning or downloading of source-code repositories.

• Creation of large archives shortly before an external transfer.

• Uploads to personal cloud-storage accounts.

• Forwarding confidential email attachments to external addresses.

• New external sharing links for restricted documents.

• Use of removable media contrary to policy.

• Unusual access to intellectual property outside normal working patterns.

These indicators are most useful when correlated. A single download, archive, or repository clone may be entirely legitimate.

The date of resignation can provide context for an investigation, but it should not be treated as an independent indicator of malicious intent.

4. Anatomy of a Potential Intellectual Property Theft Incident

Consider a hypothetical organisation that develops proprietary engineering software.

Stage 1 — Access to valuable information

An employee has authorised access to internal repositories, product documentation, and technical design files.

This access is required for the employee's normal duties.

Stage 2 — Unusual collection activity

The employee begins accessing a larger number of files than usual or downloading information from several unrelated projects.

Repository and file-access logs may reveal a change in the volume or scope of activity.

Stage 3 — Preparation of collected data

The employee copies files to a local directory or creates compressed archives.

Endpoint telemetry may record file creation, copying, renaming, and compression activity.

Stage 4 — Transfer outside authorised boundaries

The employee uploads the files to personal cloud storage, emails them to an external address, copies them to removable media, or uses another transfer mechanism.

Cloud audit records, email logs, DLP alerts, and network telemetry may help establish whether a transfer occurred.

Stage 5 — Potential disclosure or misuse

The information may be retained after departure, shared with another organisation, or used for an unauthorised purpose.

This final stage requires separate evidence. A suspicious download does not prove that information was transferred, and a transfer does not automatically prove that the information was subsequently used or disclosed.

5. Common Exfiltration Methods

Source-code repository cloning

An employee may clone internal repositories or download large numbers of files through a source-control platform.

Investigation focus: Review repository audit logs, clone and archive-download events where available, authentication records, token use, and the volume of repository activity.

Determine whether the access was expected for the employee's role and whether the destination or subsequent use was authorised.

Personal cloud storage

Confidential files may be copied to personal storage services.

Investigation focus: Correlate endpoint file access with cloud application logs, upload activity, destination accounts, and DLP alerts.

Where the service uses synchronisation software, examine which local directories were synchronised and whether the transfer involved company-managed or personal accounts.

Email and external sharing

An employee may send confidential attachments externally or change document permissions to allow external access.

Investigation focus: Review email trace records, external recipients, attachment metadata, sharing-link creation, and changes to document permissions.

Investigate whether the recipient and transfer were approved.

Removable storage

Files may be copied to USB drives or other removable media.

Investigation focus: Correlate device connection events with file writes, device identifiers, endpoint policy alerts, and the files accessed around the same time.

Local collection and archiving

Files may be gathered into a staging directory or compressed before transfer.

Investigation focus: Examine file-system telemetry, archive creation, process execution, and subsequent outbound traffic.

Archive creation alone is not proof of data theft. Its relevance depends on the files involved and what happened next.

6. SOC Investigation: Step-by-Step Workflow

A structured investigation should connect the employee's identity, access to intellectual property, collection activity, and any unauthorised transfer.

Step 1 — Validate the initial alert

Determine what triggered the investigation.

Possible triggers include:

• DLP alerts involving confidential files.

• Unusual repository downloads.

• Bulk file-access detections.

• External sharing of restricted documents.

• Personal cloud-storage uploads.

• Removable-media policy violations.

• Unusual access to intellectual property.

Record the user, device, timestamp, data source, destination, transfer volume, and detection rationale.

Check for approved project exports, backups, migrations, or handover procedures that could explain the activity.

Step 2 — Establish the user's normal access pattern

Review the employee's role, normal repository access, approved responsibilities, and historical file-access patterns.

Determine whether the employee accessed information outside their usual scope or used permissions in a way inconsistent with their responsibilities.

Use employment or resignation information only when authorised and relevant to the investigation. Avoid treating an employee's departure as evidence of wrongdoing.

Step 3 — Identify the intellectual property involved

Determine which files or repositories were accessed, downloaded, copied, or shared.

Collect relevant metadata, including:

• File names and paths.

• File sizes and timestamps.

• Repository names and commit identifiers.

• Data classification labels.

• Access and download events.

• Relevant hashes, where appropriate.

Establish who owns the information, how sensitive it is, and whether the employee was authorised to access or transfer it.

Preserve evidence through approved forensic procedures and minimise unnecessary access to confidential content.

Step 4 — Reconstruct endpoint activity

Use EDR telemetry and available operating-system logs to identify the processes and actions involved.

Look for bulk file copying, archive creation, unusual command execution, unexpected access to sensitive directories, and file activity associated with browser or cloud synchronisation processes.

On Windows systems, Security Event ID 4688 may record process creation when the relevant audit policy is enabled. EDR tools may provide additional process lineage and command-line information.

Correlate process activity with file-access and network events. Do not assume that using a command-line utility or archive program is malicious.

Step 5 — Investigate repository and cloud activity

Review the relevant source-control, document-management, and cloud audit records.

Establish whether repositories were cloned, archives were downloaded, files were uploaded, or sharing permissions were changed.

Where available, record the actor, authentication context, session details, timestamps, affected resources, and destination.

Determine whether the activity originated from a managed device and whether it was consistent with the employee's normal workflow.

Step 6 — Trace potential exfiltration

Identify how the information may have left the organisation's authorised environment.

Correlate firewall, proxy, DNS, cloud, email, and endpoint telemetry to determine the source, destination, timing, and volume of the transfer.

Encrypted traffic may conceal file contents, but metadata and application logs may still establish that a transfer occurred.

If no transfer evidence is available, document that limitation rather than concluding that exfiltration definitely occurred.

Step 7 — Assess credential exposure

Determine whether the collected files included API keys, access tokens, SSH keys, deployment credentials, or other secrets.

If credentials may have been exposed, review subsequent authentication activity and access to cloud resources, repositories, and deployment systems.

Rotate or revoke potentially exposed credentials according to the organisation's response procedures, prioritising those that provide privileged or production access.

Step 8 — Determine scope and intent

Establish the volume and sensitivity of information involved, whether the transfer was authorised, and whether the available evidence supports deliberate unauthorised activity.

Consult the relevant data owner or authorised business contact to validate the transfer's purpose. Coordinate with legal, privacy, HR, and management teams where appropriate.

Distinguish confirmed facts from hypotheses. Technical telemetry may establish what happened without independently establishing the employee's motive.

Step 9 — Contain and preserve evidence

Where unauthorised activity is confirmed or strongly suspected, follow the approved incident-response process.

Potential actions include:

1. Restricting access to affected repositories or data stores.

2. Revoking unauthorised external sharing links.

3. Preserving relevant endpoint, identity, repository, and cloud logs.

4. Suspending or limiting access where justified and authorised.

5. Rotating potentially exposed credentials.

6. Recovering organisational control over affected data where possible.

7. Reviewing whether other accounts or systems were involved.

8. Documenting actions and remaining uncertainties.

Avoid wiping devices or deleting files before relevant evidence has been preserved.

7. Evidence and Indicators to Collect

No single indicator proves intellectual property theft. Strong investigations correlate evidence from multiple systems.

Evidence sourceWhat to examineInvestigative purposeIdentity logsSign-ins, sessions, privilege changesEstablishes the account and access contextFile-access logsReads, downloads, copying, timestampsIdentifies information accessedRepository audit logsCloning, downloads, commits, token activityReconstructs source-code accessEDR telemetryProcess trees, file writes, archive creationEstablishes endpoint behaviourCloud audit logsUploads, sharing links, permission changesIdentifies cloud-based transfersEmail logsExternal recipients, attachments, forwarding rulesInvestigates email disclosureNetwork telemetryDestinations, transfer volumes, connection timingHelps trace outbound data movementDevice-control logsUSB connection and file-write eventsSupports removable-media investigationsDLP recordsSensitive-data matches and policy violationsIdentifies potential policy breaches

Preserve timestamps with their time zones. Correlate events using user IDs, device identifiers, repository names, file metadata, session IDs, and request IDs where available.

8. Detection Engineering: Correlating Behaviour Before Departure

A useful detection should combine data sensitivity, unusual access, and evidence of possible transfer.

For example, consider the following sequence:

1. An account downloads an unusually large volume of proprietary source code.

2. The endpoint creates archives containing project files.

3. The same endpoint uploads data to an unapproved external destination.

4. No corresponding approved transfer or business process can be identified.

This sequence warrants investigation because the observations collectively suggest possible unauthorised collection and transfer.

Conceptual SIEM detection logic

IF sensitive_data_access exceeds normal baseline AND bulk_download_or_repository_export occurs AND unauthorised_external_transfer is detected THEN raise an intellectual_property_exfiltration alert

This is conceptual pseudocode, not a query for a specific SIEM.

A production detection should account for legitimate handovers, authorised repository exports, scheduled backups, approved data migrations, and service accounts.

Useful enrichment includes data classification, repository sensitivity, user permissions, destination approval status, and the presence of related DLP or identity alerts.

The detection should not require an employee's resignation date to trigger. The primary evidence should be the data-access and transfer behaviour.

9. MITRE ATT&CK Mapping

The following techniques may be relevant when supported by evidence:

• T1213 — Data from Information Repositories: Relevant when an adversary collects information from repositories such as code repositories or other enterprise data stores.

• T1074 — Data Staged: Relevant when collected information is gathered into a staging location before transfer.

• T1560 — Archive Collected Data: Relevant when collected information is compressed or archived.

• T1567 — Exfiltration Over Web Service: Relevant when information is transferred through a web-based service.

• T1052 — Exfiltration Over Physical Medium: Relevant when data is removed using physical media.

• T1048 — Exfiltration Over Alternative Protocol: Potentially relevant when data is transferred through a protocol outside the primary command-and-control channel.

ATT&CK describes adversary behaviours, not proof of intent. Select mappings based on the actual collection and transfer mechanism, using the most specific applicable sub-technique when supported.

10. Preventing Intellectual Property Theft

Apply least-privilege access

Restrict access to repositories, design documents, and sensitive data according to business requirements.

Review permissions periodically and remove access that is no longer needed.

Monitor bulk data access

Establish baselines for repository downloads, file access, external sharing, and cloud transfers.

Use context-aware detections that combine unusual activity with the sensitivity of the information involved.

Protect source-code repositories

Require strong authentication, protect critical branches, review access tokens, and monitor unusual cloning or export activity.

Use narrowly scoped tokens and remove unnecessary repository permissions.

Deploy data loss prevention controls

Apply DLP controls to endpoints, email, and supported cloud applications. Configure policies for sensitive intellectual property and unauthorised external transfers.

Ensure that approved business workflows have a documented exception process.

Control removable media and external sharing

Restrict unapproved storage devices where appropriate and monitor document-sharing permissions.

Provide approved mechanisms for project handovers and legitimate data transfers.

Protect credentials and secrets

Prevent credentials from being embedded in source code, ordinary documents, or unprotected configuration files.

Use secret-management systems, minimise access, and monitor for suspicious use following possible exposure.

Establish secure offboarding procedures

Coordinate with authorised HR, management, IT, and security personnel to ensure that access changes occur at the appropriate time.

Preserve business records, transfer project responsibilities, revoke access when required, and verify ownership of repositories and other organisational assets.

Maintain an evidence-based insider-risk process

Define clear policies, escalation paths, and privacy safeguards. Ensure investigations are based on verifiable evidence and handled by authorised personnel.

11. Incident Assessment and Reporting

A final report should distinguish between the following outcomes:

• Unusual access: Activity deviates from the user's baseline but remains unexplained.

• Policy violation: Data was handled contrary to organisational policy, whether intentionally or accidentally.

• Unauthorised collection confirmed: Evidence establishes that information was copied or collected outside an approved process.

• Unauthorised transfer confirmed: Evidence establishes that information was transferred or made accessible outside authorised boundaries.

• Malicious intent supported: Multiple sources of evidence support deliberate unauthorised activity.

• Impact confirmed: The investigation establishes the information exposed, the recipient, or subsequent misuse.

• Scope unresolved: Missing logs or incomplete visibility prevent a reliable conclusion.

Document the timeline, data affected, access and transfer mechanisms, authorisation status, evidence sources, containment actions, and remaining uncertainties.

This distinction is essential for accurate incident reporting and fair decision-making.

Conclusion

Intellectual property theft before employee resignation is challenging to investigate because employees often have legitimate access to the same systems and data that may be targeted for unauthorised transfer.

A reliable investigation correlates identity activity, repository access, endpoint behaviour, cloud records, email logs, and network telemetry to reconstruct the complete data journey.

For SOC teams, the goal is not to treat resignation or unusual downloads as proof of wrongdoing. It is to establish what information was accessed, whether it crossed authorised boundaries, and what the evidence supports about the incident's impact and intent.

The strongest defence combines least-privilege access, behavioural monitoring, data loss prevention, secure offboarding, and a disciplined evidence-preservation process.

Further Reading

• MITRE ATT&CK — Data from Information Repositories (T1213)

• MITRE ATT&CK — Exfiltration (TA0010)

• NIST — Computer Security Incident Handling Guide

• CISA — Insider Threat Mitigation