Protecting Cloud Logs: Make Audit Trails Tamper-Proof

Protecting Cloud Logs Is a Security Control, Not a Setting

Protecting cloud logs is one of the most overlooked controls in Cloud Security. Most organizations assume that once CloudTrail, Activity Logs, or Audit Logs are switched on, they will at least know what happened. In practice, one of the first moves an attacker makes after gaining privileges is to attack visibility itself, turning a real incident into an "incident with no evidence."

What attackers do to your logs

Once an adversary has sufficient permissions, the logging pipeline becomes a target. Common techniques include:

• Disabling logging at the account or project level
• Deleting Log Groups or workspaces
• Shortening the retention period so records age out quickly
• Changing or deleting the shipping destination (storage or SIEM)
• Modifying policy so logs can be written but not read or searched

Each of these quietly removes the trail investigators would rely on after a breach.

How to protect logs the right way

The goal is architectural resilience, not just a configuration checkbox:

• Separate a dedicated logging account or project (central logging), isolated from the workloads it observes.
• Use a near-undeletable destination: Object Lock, WORM, or immutable storage with tightly scoped permissions.
• Block sensitive operations such as StopLogging, DeleteLogGroup, or changes to Diagnostic Settings through organizational policy, allowing only a controlled break-glass path to override.
• Alert in real time on changes to the logs themselves: stopping, deletion, retention changes, or destination changes.

Why it matters

Logging is a security asset. If you don't protect it like a critical asset, an attacker with enough permissions will work to erase the very evidence you need to detect, scope, and respond to an intrusion. Treating audit trails as immutable and independently governed keeps your detection and forensic capability intact even after credentials are compromised.

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Shared from the CSC - Cloud Security Community community, by Orel Padon.

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