What evidence do auditors commonly ask for on 27 Outbound data loss prevention (Very Good)?

Sensitive data classification labels and dictionaries loaded into the DLP engine, with the date each was last updated; DLP policies for web and email showing sensitive data patterns and volume thresholds that trigger a block; DLP incident reports with triage outcomes for blocked or flagged transfers; Coverage of DLP across email gateways, web proxies and cloud upload channels.

What is the most common gap auditors find on 27?

DLP left in monitor-only mode with blocking never switched on

ASD Strategies to Mitigate Cyber Security Incidents · Limiting the Extent of Cyber Security Incidents

`27` Outbound data loss prevention (Very Good)

Outbound web and email data loss prevention to detect and block large or unusual volumes of data or sensitive data being transferred.

Source: ASD Strategies to Mitigate Cyber Security Incidents, 27. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open ASD Strategies to Mitigate Cyber Security Incidents in the compliance library.

artefacts

held by a system

at each review

easy

to go live

Data governance / DLP tooling

where the evidence lives

teal = a system already holds it · olive = produced at each review. To go live: easy when half or more of the artefacts are already held by a system, moderate from a quarter to a half, hard below a quarter.

These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.

system holds itEvidence a system already holds

DLP policies for web and email showing sensitive data patterns and volume thresholds that trigger a block · Data governance / DLP tooling
DLP incident reports with triage outcomes for blocked or flagged transfers · Data governance / DLP tooling

periodic reviewEvidence produced at each review

none for this control

governing documentDocuments that govern the control

Sensitive data classification labels and dictionaries loaded into the DLP engine, with the date each was last updated · Policy repository / GRC workspace
Coverage of DLP across email gateways, web proxies and cloud upload channels · Policy repository / GRC workspace

First move

Automate the pull from your Data governance / DLP tooling. DLP policy hits, retention job logs and disposal certificates from the tooling.

Common gaps auditors find

DLP left in monitor-only mode with blocking never switched on
Personal webmail and cloud storage uploads bypass the DLP inspection path
Thresholds so high that bulk data transfers go unflagged

Do this for your whole sheet

Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.

Build my evidence sheet

26 Software firewall - outbound (Very Good) · 28 Continuous incident detection and response (Excellent)