Vlad Korolev

Developer

CodeBreaker 2018, Final Remarks

January 12, 2019

Codebreaker challenges are always fun and educational. This year’s it was especially good. It span multiple areas reverse engineering and…

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CodeBreaker2018 walkthrough, Task 7 Refunds

January 11, 2019

Our final task is to take over Escrow contract and refund the money back to the victims who payed. After completing task 6 , the solution…

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CodeBreaker2018 walkthrough, Task 6 Loophole

January 10, 2019

In this task we are going to trick the attackers to reveal us decryption key without paying any ransom. Before we dive in, it will help to…

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CodeBreaker2018 walkthrough, Task 5 Containment

January 9, 2019

In this task we are asked to find out which hosts were infected on our network given the victim ids we have discovered in Task 4 . What do…

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CodeBreaker2018 walkthrough, Task 4 Victims

January 8, 2019

Now we need to find out who the rest of the victims are. To solve this task we need to have some understanding how blockchain works. Before…

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CodeBreaker2018 walkthrough, Task 3 Connections

January 7, 2019

While solving Task 1 , we didn’t reverse engineer the CID function. Now, this is the time to do so. Again, we’ll use Radare. Looks like it…

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CodeBreaker2018 walkthrough, Task 1 It begins

January 5, 2019

In this task we are asked to examine the binary pieces left over by ransomware and captured network traffic to extract the following…

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CodeBreaker2018 walkthrough, Task 2 Secrets

January 4, 2019

Let’s look at Task 2 before doing Task 1. It’s much quicker and easier task, and it will give us some warm up practice in reverse…

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CodeBreaker2018 walkthrough, Task 0 Warm up

January 3, 2019

This task is really simple, all you need to do is download given capture file and analyze it with a tool like tcpdump or WireShark Let’s…

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CodeBreaker 2018, complete walkthrough

January 2, 2019

Every year publishes a challenge to reverse engineer and exploit something. Past challenges involved disarming simulation of IED…

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Welcome to the new home!

January 1, 2019

I haven’t been posting regularly here for a very long time. We’ll try to resume this blog. Let’s see how long it’s going to last this time…

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Simple script to convert opml to markdown

April 23, 2014

I just put a quick transform script to convert outlines generated by OmniOutliner to MarkDown slide deck. The markdown is specific to…

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New version 0.5 of AWS4C has been released

June 28, 2011

Just released new version of AWS4C library. The new release includes support for S3 delete operation. Check the API Reference and example…

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Port of RXTX library to Android platform

March 1, 2011

Just ported the RXTX library to the Android platform. Check out the picture below, it shows the Motorola Droid phone talking to the…

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New version of AWS4C has been released

October 3, 2010

Just released new version of AWS4C library. The new release includes support for Reduced Redundancy Storage and some bug fixes related to…

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Compiling native programs for Android

August 18, 2010

There is an excellent tutorial by Nirnimesh on how to compile native programs for Android here http://android-tricks.blogspot.com/2009/0…

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AWS4C has been updated

November 18, 2009

Thanks to Henry N. for sending patches to the AWS4C library. I applied and tested them, hence the new release of the library. Here is the…

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AWS4C a C library that lets you work with AWS

August 15, 2009

Believe it or not some people need to write programs to access Amazon Web Services in C. This project grew out of the conversion of my old…

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Hadoop tutorial for Windows and Eclipse

March 20, 2009

Hadoop tutorial for Windows and Eclipse . Just posted a tutorial on how to configure Hadoop environment for Windows using CYGWIN . The…

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