Desktop apps hold session data locally and trust the network. We test installed clients the way attackers with laptop access would — memory, storage, updates, and traffic.
Find credentials in memory, logs, or config files.
Reduce tampering and local privilege escalation.
Satisfy security for finance, healthcare, and government desktops.
Ensure the app cannot be tricked into leaking data.
CERT-In empanelled · India
Sumrite’s testers run your thick client VAPT by hand, and the report is issued through a CERT-In empanelled auditor. One team from scoping to sign-off, built for Indian regulators, enterprise buyers and government work.
Yes. We run the full engagement for you and route the formal attestation through our network of CERT-In empanelled partner auditors, so you deal with one team from scoping to report.
Thick client VAPT is a security test of software installed on a desktop or laptop, such as a trading terminal, a hospital records client, an internal finance tool or an Electron app. Unlike a web app, a thick client does much of its work on the user's machine, so it often stores session data locally, keeps secrets in memory or configuration files, and trusts the network more than it should. A tester examines the installed application the way an attacker with access to the laptop would: reading local storage and memory, decompiling .NET, Java or Electron code, intercepting traffic between the client and its server, and checking whether the installer or auto-update can be abused to run code or gain higher privileges. The server the client talks to is tested too, because a client-side check is no protection if the server trusts whatever it receives.
| Area | Typical tools |
|---|---|
| Decompiling and reversing | dnSpy, ILSpy, JD-GUI, Ghidra |
| Traffic interception | Burp Suite, Echo Mirage, Wireshark |
| Runtime and memory | x64dbg, Process Hacker, Frida |
| File, registry and process activity | Process Monitor, Sysinternals Suite |
Tools speed up routine work; findings are confirmed by hand.
Read next: See a sample thick client VAPT report
| Area | What we check | Example finding |
|---|---|---|
| Local data | Credentials, tokens and personal data in files, registry or logs | A database password in a readable config file |
| Memory | Secrets and session data held in process memory | A user's session token recoverable from a memory dump |
| Binary protections | Decompilation, tampering, debug and signing checks | A licence or role check removed by patching the binary |
| Client-server trust | Traffic interception and server-side validation | The server accepts a price changed in the client's request |
| Installer and updates | Update integrity, file permissions, privilege escalation | An unsigned update path that runs attacker code as admin |
.NET (WinForms and WPF), Java, Electron and native Windows and macOS applications, together with the backend services they connect to.
The installer or build, test accounts, and access to a test backend. A short walkthrough of the main workflows helps the tester focus on what matters.
The client often holds secrets, cached data and logic of its own. Attackers with access to one laptop can extract those, or use the client to send requests the server was never designed to receive.
We run the full engagement for these frameworks, and where a formal audit or attestation is needed we route it through our local partner firms, so you deal with one team.
Thick clients bypass browser sandboxes. Weak local encryption and debug builds in production still cause major incidents.
Sumrite's Thick Client VAPT combines binary review, runtime inspection, and protocol testing before wide rollout.
Methodology, scope, and deliverables in plain terms.
OWASP client-side and PTES: local storage, updates, binary protections, and API traffic.
Risk-rated report with reproduction and fixes. Re-test included on standard engagements.
Every step from scope and NDA to a retested, final report, shown for Thick Client VAPT. No jargon, no surprises.
Submit your scope so our team can plan the engagement and get started.
Every phase is run by a security expert, with tools used only to speed up the routine parts. Findings are reproduced and confirmed before they reach your report.
Findings are written for two readers at once: developers who need the exact fix and auditors or buyers who need confidence.
Your team fixes the issues with guidance written for your stack, and the tester who found each issue answers questions directly.
Every fix is tested again. Nothing is marked closed on trust.
You receive a verified report in your company name, ready for clients, auditors and procurement.
Share platform and distribution. We scope it fast.
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