Reducing data exfiltration by malicious insiders
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Advice and recommendations for mitigating this type of insider behaviour.
Adapted edition
- Document type
- Reference Guide
- Format
- DOCX
- Pages
- 10
- Language
- English
- Version
- 1.0
- Updated
- 2026-09-16
- Category
- Information security
- Licence
- Open Government Licence v3.0
Description
Advice and recommendations for mitigating this type of insider behaviour for organisational planning, review and training. NCSC guidance is advisory and should be applied to the organisation's own risks and obligations.
Contents
- Note
- Introduction
- Prevent, monitor, audit
- Note that:
- Technical measures that can prevent data exfiltration
- Technical controls
- Recommended mitigations for data exfiltration
- Recommendation 1
- Recommendation 2
- Recommendation 3
- Recommendation 4
- Recommendation 5
- Recommendation 6
- Appendix A: Baseline assessment of exfiltration techniques
- Appendix B: Why and how is data exfiltrated?
- Exfiltration methods
- Source links
Source and licence
National Cyber Security Centre
AttributionNational Cyber Security Centre, “Reducing data exfiltration by malicious insiders” (30 June 2022), reused under the Open Government Licence v3.0.
ChangesAdapted 16 September 2026: converted the official HTML article into neutral text-only DOCX and PDF editions. Preserved article headings, paragraphs, lists and plain-text source-link destinations; normalized web whitespace and typographic punctuation; omitted site navigation, topic and download cards, images, logos, scripts, styles and page furniture.
Version history
- v1.016/09/2026