What Is Application Whitelisting?
Application whitelisting is one of the most effective security controls available. Instead of trying to detect and block every piece of malware (which is what traditional antivirus does), whitelisting takes the opposite approach: only software that has been specifically approved is allowed to run. Everything else is blocked automatically.
This means that even if a new piece of ransomware or malware lands on your system — through an email attachment, a USB drive, or a compromised website — it simply cannot execute. It is blocked before it ever gets the chance to do damage.
Why It Matters
Traditional antivirus relies on recognising known threats. But new malware variants are created constantly, and there is always a window between when a threat appears and when antivirus vendors release a detection update. Application whitelisting eliminates that gap entirely — if the software is not on your approved list, it does not run. Period.
The Australian Cyber Security Centre (ACSC) ranks application whitelisting as one of the Essential Eight mitigation strategies, and for good reason. It is one of the most effective ways to prevent malware execution on your systems.
How We Manage It
- Initial audit — We survey your systems to identify all the software your team currently uses and build your approved application list.
- Policy deployment — We deploy whitelisting policies across your workstations and servers using ThreatLocker, ensuring only approved applications can execute.
- New software requests — When your team needs a new application, they request it through our help desk. We review it, approve it, and add it to the whitelist.
- Ongoing management — We handle updates to approved applications, review blocked attempts, and adjust policies as your business needs change.
- Ringfencing — We go beyond simple whitelisting by controlling what approved applications are allowed to do — preventing legitimate tools from being used maliciously (e.g. stopping PowerShell from accessing the internet).
What Gets Blocked?
- Ransomware and malware that has never been seen before (zero-day threats)
- Unauthorised software installed by staff (shadow IT)
- Malicious scripts and macros embedded in documents
- Fileless malware that tries to abuse built-in system tools
- Unapproved remote access tools that attackers use to maintain access
What You Get
- ThreatLocker application whitelisting deployed and managed
- Ringfencing policies to control application behaviour
- Approved software list built from your current environment
- New application request and approval workflow
- Blocked application reporting and review
- Ongoing policy management and updates
- Alignment with ACSC Essential Eight requirements