Thick client (desktop) applications — common in Cyprus finance, forex and trading software — carry risk a web test never sees: secrets baked into the binary, data cached insecurely on disk, and trust placed in a client the attacker fully controls. This is dedicated thick client penetration testing across the binary, the local system and its back-end.
We treat the installed application as fully attacker-controlled: reverse-engineering it for hardcoded secrets and logic, inspecting how it stores data and loads libraries, and intercepting its traffic to test the server it trusts. Client-side controls are assumed bypassable and tested as such.
The core thick-client mistake is trusting the client — enforcing licensing, validation or authorization in software the user owns and can patch. For regulated Cyprus software vendors that trust is a real liability, and it is exactly what we break, then follow to the back-end.
What we test
Binary and reverse-engineering analysis
Local data storage and configuration security
Traffic interception and TLS validation
DLL hijacking and library loading
Inter-process communication (IPC) security
Privilege escalation and installation flaws
Common vulnerabilities we uncover
Hardcoded credentials and secrets in binaries
Insecure local storage of sensitive data
Weak or missing transport encryption
DLL hijacking and injection
Insecure IPC and named-pipe abuse
Client-side trust and tampering flaws
How we run your engagement
Kick-off & scoping. A short call to agree goals, in-scope assets and rules of engagement, so your thick client application penetration testing is safe, authorised and aimed at your real business risk.
Mapping & discovery. Before touching anything we map the full attack surface in scope, so nothing exploitable slips through.
Hands-on testing. Cyprus-based specialists exploit and chain weaknesses manually — the flaws scanners walk straight past — to show genuine impact.
Reporting. Each issue is verified, CVSS-rated and documented with a step-by-step reproduction and a practical fix your team can apply.
Free retest. Once you have remediated, we re-test at no extra cost to confirm the attack path is truly closed.
Tools & techniques
Our approach spans three layers: the binary (reverse engineering, hardcoded secrets, anti-tamper), the local system (storage, registry, DLL loading, IPC, privilege), and the network (intercepting and testing the back-end API the client trusts). Findings are proven, not theorised.
Because the server behind a thick client is often the bigger prize, this connects to our API penetration testing and secure code review, and complements full web application penetration testing.
When you need this engagement
You ship a Windows, macOS or Linux desktop application
Your client talks to APIs or databases directly
You handle licensing, secrets or sensitive local data
You are in finance, trading or industrial software
You need more than a web-only assessment
What you receive
Executive and technical report with evidence
Binary, storage and traffic findings prioritised
Reproduction and remediation guidance
Back-end API findings where in scope
Attestation letter where required
Complimentary retest after fixes
Your deliverables
When your thick client application penetration testing wraps up, you receive a clear, audit-ready report plus a walkthrough call with your team. Inside you will find:
A concise executive summary that management and the board can act on
Every technical finding with a reproducible, copy-paste proof of concept
CVSS v3.1 ratings and plain-language business impact for each issue
Practical, prioritised remediation your developers can implement straight away
A free retest and updated finding status once fixes are in place
A signed attestation letter for clients, auditors, GDPR, NIS2 and ISO 27001
Standards & frameworks
OWASP (adapted for thick clients)CWE Top 25NIST SP 800-115Platform hardening guidance
What you gain
By the end of your thick client application penetration testing, you will know exactly which weaknesses a real attacker could exploit, what it would cost your business, and the precise order in which to fix them — backed by evidence, not a scanner’s guesswork. Cyprus firms use our findings to close critical gaps, satisfy client and regulator security questionnaires, and demonstrate due diligence for GDPR and NIS2. With a free retest included, you also get documented proof the issues are resolved.
Working with us
Every thick client application penetration testing begins with a short, no-obligation scoping call to understand your goals, environment and constraints, followed by a fixed-price proposal. Most work is delivered remotely, and because we are based in Cyprus we work in your timezone with on-site visits across Limassol, Nicosia and island-wide where it helps. We keep you updated throughout and flag any critical finding immediately rather than waiting for the report. Everything is covered by a signed NDA and safe, non-disruptive testing that protects your production systems. You receive your report, a walkthrough and a complimentary retest once fixes land. Engagements are typically booked one to three weeks ahead, and urgent testing can often be arranged — just email hi@cypruspentest.com.
Why Cyprus businesses choose CyprusPentest
Your thick client application penetration testing is run by senior offensive-security specialists who test the way genuine attackers do — manually, creatively and focused on proving real impact. What sets us apart:
Based in Cyprus — local, in your timezone, with on-site coverage across Limassol and Nicosia.
Manual, exploit-led testing that chains vulnerabilities the way an attacker would, well beyond automated scanners.
Reproducible proof for every finding, with copy-paste steps your team can independently verify.
Compliance-ready reporting that supports GDPR, NIS2, ISO 27001 and CySEC expectations.
A free retest so you have documented evidence your fixes actually hold.
Fixed-price and responsive, with a named point of contact from scoping through to retest.
Explore related services
Thick Client Application Penetration Testing pairs well with our other Cyprus penetration testing services for fuller coverage. You may also want:
Web Application Penetration Testing — Web application penetration testing in Cyprus. Manual, exploit-led testing for Limassol & island-wide businesses — OWASP-aligned,…
API Penetration Testing — API penetration testing in Cyprus for REST & GraphQL. OWASP API Top 10, BOLA/BFLA and token…
Secure Code Review — Secure code review in Cyprus. Manual source audit plus SAST for Limassol software teams — find…
How much does Thick Client Application Penetration Testing cost?
Every thick client application penetration testing in Cyprus is scoped and priced individually, so you pay only for the coverage you need — with no hidden extras. After a short, no-obligation scoping call we send a fixed-price quote, usually within one business day, with clear deliverables, a firm timeline and a complimentary retest included. The price depends on the size and complexity of your environment, so you always know the cost up front before any work begins.
