Ringzer0team CTF Writeup – ELF Crackme 1 – Time to Learning x86 ASM & gdb

Register yourself if you have not yet. Access the challenge at http://ringzer0team.com/challenges/11 Download the subject,  the checksum: f6816b590d2021a16ba8005aa235e6a3 (md5) b8c18db3e4678e09683e3b20e9004d1183c2420b (sha1) The challenge clearly instruct as to utilize GDB. In this case, I have customize my GDB using init script which can be downloaded from my github. After downloading the binary, ran ‘file’ then ‘readelf’ […]

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My Student’s Final Project, 20 January 2015

Here is my presentation of student’s final project as requirement for graduation from Institut Teknologi Bandung (ITB). The slides would be in Indonesian Language. The title would be “Analisis Keamanan dalam Pengembangan Sistem Transaksi ATM Menggunakan Otentikasi Pembuluh Darah” or in English it would be “Security Analysis on ATM System Development using Vein Authentication” — […]

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New Sister Site

Hi, Xathrya’s here. I’m planning to create some new sites which will act as sister sites. They are not finished yet, however I will announce it earlier. Why should I create more sites and not using this site? There is no particular reason. Really. I just create it because I want. Also, it sounds cool. […]

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Running Debian MIPS Linux in QEMU

Have you ever want to try system other than your PC? MIPS for example. As a reverse engineer, I sometimes want to run a MIPS Linux system so that I can observe, develop, and testing somethings. However, I don’t have much room for another device, so virtualization might be a solution. In this article we […]

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Installing QEMU from Source

QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine. By using dynamic translation, it achieves very good performance. In this article we will discuss about installing QEMU and use […]

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Building GCC MinGW Toolchain Cross Compiler

Windows, up until today, is still popular Operating System and have large market. This Microsoft’s product is designed for end-user and reducing complexity of Operating System. Even when some other OS such as Linux and Mac OS starts invading, this Operating System is still major and fanatically used by some people in the world. In […]

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Base Conversion and Rax2 (Radare2 Framework)

As a reverse engineer, we are often face various number in various base and then the need to do conversion rise. We need a handy and simple calculator and converter tool to convert numbers from different bases, change the endianness, etc. Our shell and linux might ship this capability but not as flexible as we […]

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Reverse Engineering Hostile Codes

Computer criminals are always ready to compromise weakness in the system with their hostile codes. Computer Viruses, Worms, Trojans, Malwares, you name it. Often these programs are custom compiled and not widely distributed. Because of this, anti-virus software won’t detect their presences. In this article we will try to outlines the process of reverse engineering […]

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OverTheWire.org Wargames – Bandit – Level 20 to Level 29

OverTheWire.org is one of good site offer WarGames. In this context, WarGame is a game specifically designed to help people learn and practice security concepts in the form of fun-filled game. One of wargame category provided by OverTheWire is Bandit category which is aimed at absolute beginners. This writeup contains solutions of the OverTheWire challenges […]

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OverTheWire.org Wargames – Bandit – Level 10 to Level 19

OverTheWire.org is one of good site offer WarGames. In this context, WarGame is a game specifically designed to help people learn and practice security concepts in the form of fun-filled game. One of wargame category provided by OverTheWire is Bandit category which is aimed at absolute beginners. This writeup contains solutions of the OverTheWire challenges […]

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