Offensive Security & VAPT
Thick-Client App Security
Desktop and thick-client applications often hide insecure storage, weak IPC, broken auth and exposed business logic. We test Windows, macOS and Java/.NET thick clients - static, dynamic and at the network layer.
Typical timeline
8–12 business days
Engagement model
Grey / black / white box
How it runs
Kickoff → test → report → re-test
Overview
Thick client and desktop applications often bypass traditional firewalls, exposing business logic, insecure local files, and database connections directly on user machines.
We test Windows, macOS, and Java/Electron desktop applications, combining binary reverse engineering with dynamic execution and local filesystem analysis.
At a glance
- Static and dynamic analysis of the client
- Insecure storage, IPC and registry findings
- Network and API traffic interception
- Business-logic and auth bypass testing
Coverage
What we cover
Binary Obfuscation
Evaluating code de-compilation protections, anti-debugging, and memory tampering controls.
Local Data Auditing
Checking the local filesystem, registry, and application cache for sensitive credentials.
IPC & Communication
Probing Inter-Process Communication channels, named pipes, and local TCP ports for hijack avenues.
API Traffic Tampering
Intercepting and modifying traffic between the desktop client and backend API endpoints.
Outcomes
What you get
Methodology
How the engagement runs
Recon
Map architecture, endpoints and data flows.
Analyze
Reverse engineering and static analysis.
Exploit
Dynamic testing, tampering and traffic attacks.
Report
Findings with PoCs and remediation.
Deliverables
What lands in your inbox
- Thick-client security report
- Risk-rated findings with PoCs
- Remediation guidance
Why A5
Why teams pick us
Manual-first, not scan-first
Senior testers hand-craft test cases for your business logic - scanners only set the baseline.
Proof, not guesses
Every finding ships with a working proof-of-concept and exact reproduction steps.
Fix-focused reporting
Remediation with code and config examples, not just a CVSS number and a shrug.
Re-test included
We verify your fixes and issue a clean report - closure, not just discovery.
FAQ
Frequently asked
Which platforms?
Windows, macOS and Linux desktop apps, including Java, .NET and Electron clients.
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Need thick-client app security?
Prove both before launch.
Bring us your app, audit deadline, or security concern. We'll map the fastest path to WCAG conformance, VAPT coverage, and regulator-ready evidence.
