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Reverse Engineering Thick-clients

Reverse Engineering Thick-clients. Steven C. Markey , MSIS, PMP, CISSP, CIPP/US, CISM, CISA, STS-EV, CCSK Principal, nControl, LLC Adjunct Professor. Reverse Engineering Thick-clients. Agenda Thick-client Overview Attack Surface Reverse Engineering Thick-clients.

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Reverse Engineering Thick-clients

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  1. Reverse Engineering Thick-clients Steven C. Markey, MSIS, PMP, CISSP, CIPP/US, CISM, CISA, STS-EV, CCSK Principal, nControl, LLC Adjunct Professor

  2. Reverse Engineering Thick-clients • Agenda • Thick-client Overview • Attack Surface • Reverse Engineering Thick-clients

  3. Reverse Engineering Thick-clients • Thick-client Overview • “Old School” • Local Software & Occasional Local Storage • Local Software Connecting to Server Software • Traditionally Installed Local Software via TCP/IP Sockets • Web Delivered Local Software via TCP/IP Sockets • Web Delivered Local Software via HTTP/S • Alternative to Web/Thin Clients • Occasionally More Efficient • Allows for Interaction with Local Office Automation Software • Allows for Syncing/Batch Uploads for Offline Use

  4. Reverse Engineering Thick-clients • Thick-client Attack Surface • Local Software & Local Storage = Local Exposures • Rootkits • Cache & Registry Corruption • Information Disclosure • One-off Exposures • Access to Office Automation Software Exposures • Ignorance is Bliss • Assumed Lack of Attack Surface • Can Still Proxy Requests • Sniffers Can Be Goldmines • Overreliance on Data in Transit Crypto Protections • Overreliance on Segregation of Duties & Access Controls

  5. Reverse Engineering Thick-clients • Reverse Engineering Thick-clients • Tools • Decompilers: Dotpeek, Reflector, JustDecompile, ILSpy, DILE, PEBrowse, Java Decompile, Mocha & DJ Java Compiler • Profilers: Eclipse – Test & Performance Tools Platform (TPTP), MSVS – MSIL Disassembler (lldasm), YourKit & DTrace • Proxies: Burp – Wsdler.jar, BurpJDSer.jar, ZAP & Paros • Sniffers: Wireshark • Access • Binaries • Local Files, Storage, & Office Automation Plugins

  6. Reverse Engineering Thick-clients • Example • App • Java Swing TCP-based Thick-client  AWS EC2 Java 7 • AWS AMI Linux Distro, Executable JAR on Server & Local MySQL • Windows 8.1, Java 7 • Tools • Decompilers: DJ Java Decompiler & Mocha • Profilers: YourKit • Proxies: Burp – Wsdler.jar, BurpJDSer.jar • Sniffers: Wireshark • Access • Binaries, Local Files, Storage & Office Automation Plugins

  7. Questions? • Contact • Email: steve@ncontrol-llc.com • LinkedIn: http://www.linkedin.com/in/smarkey • Twitter: markes1

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