Data Exfiltration To Cloud Storage

CLOUDEXFILTRATION · AGUIDEFORUKLAWYERS Data Exfiltration to Cloud Storage Tracing Company Data Uploaded to Personal and Third-Party Clouds COMPUTERFORENSICSLAB § ABOUTTHEAUTHOR PRE PA REDBYCOMPUTERFORENSICSLABE - DISCOVERYTEAM ESTABLISHED 2007 · LONDON ISO 17025-ALIGNED PROCEDURES CLOUD-EXFILTRATION INVESTIGATION SYNC-CLIENT & EGRESS ANALYSIS CPR PART 35 EXPERT REPORTS FULL CHAIN-OF-CUSTODY DOCUMENTATION § CONTENTS In this guide 01 Executive summary 02 The problem in plain English: the network copy that writes to both ends 03 The routes: sync clients, browser uploads, sharing, webmail and rules 04 The endpoint record: sync databases, browser artefacts and local traces 05 The platform and network record: audit logs, sharing events and egress 06 The destination: reaching the personal cloud account through process 07 Quantification, deployment and the innocent explanation 08 Source architecture: where else the evidence lives 09 Worked examples 10 Common mistakes and technical limitations 11 Questions to ask · Suggested wording 12 Checklist and red flags · When to involve a digital forensic expert 13 Frequently asked questions 14 Glossary · References · Disclaimer · How a specialist laboratory can assist § 0 1 · ORIENTATION Executive summary THEHEADLINEPOINT : CLOUDEXFILTRATIONWRITESTOTHEENDPOINT , THE CORPORATEPLATFORM , THENETWORKANDTHEDESTINATIONACCOUNT : PROVEWHAT LEFTFROMTHEFIRSTTHREE , REACHWHEREITWENTTHROUGHTHEFOURTH , AND QUANTIFYTOAFILE - LEVELMANIFEST § 0 2 · FIRSTPRINCIPLES The problem in plain English: the network copy that writes to both ends § 0 3 · THEROUTES The routes: sync clients, browser uploads, sharing, webmail and rules § 0 4 · THEENDPOINTRECORD The endpoint record: sync databases, browser artefacts and local traces § 0 5 · THEPLATFORMANDNETWORKRECORD The platform and network record: audit logs, sharing events and egress § 0 6 · THEDESTINATION The destination: reaching the personal cloud account through process 97 §7): what arrived, who accessed it, and its quarantine and return: the receiving side of the transfer. § 0 7 · QUANTIFICATIONANDDEPLOYMENT Quantification, deployment and the innocent explanation § 0 8 · THEWIDERMAP Source architecture: where else the evidence lives QUESTION PLATFORM ACCOUNT + EMPLOYER ORIGINATING EGRESS BEHAVIOURAL ENDPOINT (PROXY/ LAYER CORPORATE DESTINATION NEW AUDIT PROVIDER ESTATE NETWORK DLP/CASB) § 0 9 · INTHEWILD Worked examples EXAMPLE1 · THEPERSONALDRIVETHATMIRROREDTHEWHOLEDESK EXAMPLE2 · THEFOLDERTHATWASSHARED , NOTDOWNLOADED EXAMPLE3 · THESYNCTHATWASSANCTIONED , ANDTHECLAIMTHATNARROWED § 1 0 · WHEREITGOESWRONG Common mistakes and technical limitations Common mistakes Technical limitations § 1 1 · INTERROGATORIES & DRAFTINGAIDS Questions to ask · Suggested wording Ask your client Ask your opponent (the former employee / new employer) Ask your eDiscovery / forensic provider ( FIRSTLETTER ) § 1 2 · QUICKCONTROL Checklist and red flags · When to involve a digital forensic expert The cloud-exfiltration checklist Red flags When to involve a digital forensic expert § 1 3 · COMMONQUESTIONS Frequently asked questions The data went to a personal cloud account. Can we even prove it? The employee just shared a folder rather than downloading anything. Is that exfiltration? Can we get into the employee's personal cloud account? The employee had a sanctioned personal cloud for home-working. Does that defeat the claim? How fast do we need to move? Does the employer have its own obligations if client personal data left? § 1 4 · REFERENCE Glossary CASB DLP Sources and authoritative references DISCLAIMER § HOWASPECIALISTLABORATORYCANASSIST Working with Computer Forensics Lab Speak to a forensic examiner, not a salesperson. INSTRUCTTHELAB NEWENQUIRIESEMAILE - DISCOVERY