Thick Client Security
Assessment

Comprehensive security assessment for thick client applications. We perform binary reverse engineering, DLL hijacking analysis, memory credential extraction, and communication security testing with CVSS-scored findings and a free re-test.

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Binary Reverse Engineering DLL Hijack + Side-Loading Memory + Runtime Analysis Free Re-Test
Disassembly
0x00401000
0x00401010
0x00401020
0x00401030
0x00401040
0x00401050
0x00401060
0x00401070
0x00401080
0x00401090
PUSH EBP
MOV EBP, ESP
SUB ESP, 0x20
CALL LoadLibraryA ; vulnerable DLL
MOV EAX, [EBP+8]
PUSH 0x4B657973 ; "Keys"
LEA ECX, [EBP-0x10]
PUSH ECX
CALL DecryptCreds
TEST EAX, EAX
DLL Hijack
Hardcoded Key
Mem Extract
Config File
Testing Areas

What We Test on Your Thick Client

Purpose-built attack scenarios for desktop applications, covering binary, storage, memory, and communication.

Binary Reverse Engineering

We decompile .NET, Java, and native binaries to identify hardcoded credentials, embedded connection strings, and insecure business logic in the compiled code.

DLL Hijacking and Side-Loading

We identify DLL search order hijacking, side-loading via phantom DLLs, and vulnerable library loading that enables privilege escalation and persistence.

Anti-Debugging and Tampering

We test anti-debugging controls, code obfuscation strength, and tamper detection mechanisms for bypass opportunities.

Hardcoded Secrets Discovery

We extract hardcoded API keys, database passwords, encryption keys, and connection strings embedded in the binary or configuration files.

Licensing and Activation Bypass

We test licensing enforcement mechanisms for bypass opportunities, including trial period extensions and feature unlock vulnerabilities.

Insecure Code Patterns

We identify insecure coding patterns in decompiled source, including weak cryptography, insecure deserialization, and input validation flaws.

Local Database and File Storage

We audit SQLite databases, local files, and application directories for plaintext credentials, session tokens, and sensitive data at rest.

Registry and Configuration Analysis

We examine Windows registry keys, INI files, XML configs, and JSON settings for sensitive data persistence and weak ACLs.

Memory Credential Extraction

We dump process memory during runtime to extract credentials, tokens, encryption keys, and decrypted sensitive data held in RAM.

Cache and Temp File Analysis

We identify sensitive data leakage through temporary files, crash dumps, hibernation files, and application caches.

Credential Storage Mechanisms

We test password managers, credential stores, and custom encryption implementations for weak protection or key retrieval.

Data Persistence After Logout

We verify whether sensitive data is properly cleared from memory and disk when the user logs out or the application closes.

Client-Server Communication

We intercept and analyse all traffic between the thick client and backend servers for cleartext transmission and weak encryption.

TLS and Certificate Validation

We test TLS implementation for weak ciphers, certificate validation bypass, and man-in-the-middle attack opportunities.

Session Management and Replay

We test session tokens for replay attacks, session fixation, and whether sessions are properly terminated on logout.

Backend API and Database Testing

We test backend APIs and database connections exposed through the thick client for SQL injection, authentication bypass, and data exposure.

Custom Protocol Analysis

We reverse engineer proprietary communication protocols used by legacy thick clients for insecure custom encryption or authentication.

Update Mechanism Security

We test automatic update mechanisms for man-in-the-middle attacks, unsigned updates, and arbitrary code execution via update channels.

Methodology

How We Run a Thick Client Security Test

A structured six-phase process covering binary analysis, storage, memory, and communication testing.

Phase 01
Application Architecture Review

We map the thick client architecture, identify all components, communication channels, data storage locations, and dependent libraries for testing scope.

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02
Phase 02
Binary and Code Analysis

We decompile managed binaries, review native code with disassemblers, and identify hardcoded secrets, insecure configurations, and vulnerable components.

Phase 03
Local Storage and Registry Testing

We audit all on-disk storage, Windows registry keys, and configuration files for sensitive data persistence and improper access controls.

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04
Phase 04
Memory and Runtime Analysis

We dump and analyse process memory during runtime for credentials, tokens, encryption keys, and decrypted sensitive data held in RAM.

Phase 05
Communication and Session Testing

We intercept and test client-server communication for protocol vulnerabilities, TLS weaknesses, and session management flaws.

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06
Phase 06
Reporting and Free Re-Test

We deliver a CVSS-scored report with proof-of-concept evidence and CWE mapping. Once you remediate, we re-test all findings at no additional cost.

Who It's For

Built for Organisations With Desktop Applications

Banking and Financial Trading Platforms

Trading terminals, banking workstations, and financial desktop applications handling sensitive transaction data that requires protection against memory extraction and credential theft.

ERP and Enterprise Desktop Software

SAP, Oracle, and custom ERP clients with thick desktop interfaces connecting to backend databases, requiring assessment of hardcoded credentials and communication security.

Healthcare and Industrial Workstations

Clinical workstations, SCADA HMIs, and industrial control interfaces running as thick client applications that need protection against DLL hijacking and privilege escalation.

FAQ

Questions We Get Asked Often

Thick client security assessment covers desktop and fat-client application security. It includes binary reverse engineering to find hardcoded secrets, DLL hijacking and side-loading vulnerability testing, memory credential extraction during runtime, local storage and registry analysis, and client-server communication security testing. Unlike web applications, thick clients present unique attack surfaces involving compiled code and local system access.

Common thick client vulnerabilities include DLL hijacking and side-loading that enable privilege escalation, hardcoded credentials and connection strings in binaries or config files, memory credential extraction where passwords are held in plaintext in RAM, insecure local storage of session tokens and sensitive data, weak or disabled TLS for client-server communication, and vulnerable update mechanisms that allow man-in-the-middle code execution.

Yes. We decompile managed binaries (.NET, Java) using tools like dnSpy and JADX, and analyse native code with disassemblers like IDA Pro and Ghidra. We identify hardcoded secrets, embedded connection strings, insecure cryptographic implementations, licensing bypass vulnerabilities, and vulnerable code patterns through static and dynamic analysis.

We need the thick client installer or deployed application, valid credentials for all user roles, a brief overview of the application architecture and critical functionality, and access to any backend servers or APIs if in-scope. For comprehensive testing, we may also need test data and documentation of custom protocols or encryption.

Typical engagements take 5 to 12 business days depending on application complexity, whether native code analysis is required, the number of user roles, and scope of backend testing. Applications with complex binary protection or custom protocols may require additional time.
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Ready to Secure Your Desktop Applications?

Get a thick client security test with binary analysis, DLL hijacking testing, memory extraction, and communication security assessment. Free re-test included.

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