LT-7 Use approved time synchronization sources
Use approved time synchronisation sources for log timestamps so recorded date, time and time zone are consistent and correlatable across systems.
4
artefacts
3
held by a system
1
at each review
easy
to go live
SIEM / log platform
where the evidence lives
teal = a system already holds it · olive = produced at each review
system holds itEvidence a system already holds
- Approved time source list and configuration on hosts and services · Cloud console / configuration management
- Drift monitoring results · SIEM / log platform
- Timestamp and time zone convention applied in logging · SIEM / log platform
periodic reviewEvidence produced at each review
- Evidence of correlation across systems during an investigation · Document repository
governing documentDocuments that govern the control
none for this control
First move
Automate the pull from your SIEM / log platform. Retention and alert rules exported from the SIEM; review evidence is the closed-alert record with reviewer and time.
Common gaps auditors find
- hosts pointing at arbitrary public time servers
- time zone recorded as local rather than a fixed reference
- drift unmonitored so correlation silently fails
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 sheetLT-6 Configure log storage retention · NS-1 Establish network segmentation boundaries