Code of The Day

Cyber Security, Software Engineering, and sometimes, Life

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  • UA CSW CTF 2022 Write Up Dump

    Dump of some solutions for this beginner friendly CTF. It was relatively easy compared to others. Web Penguim – (De)Serial Killer Login page Homepage Weird looking cookie Path Traversal in picture_path Flag is rendered as base64 Missing Out Source. Immediately looking at werkzeug console exploit. Since the app.log is in the same folder and the […]

    Chan Jin Hao

    May 27, 2022
    CTF
  • HTB Cyber Apocalypse Forensics

    Dump of the 3 Forensics challenge that I solved Generally for Windows forensics, I like to use Autopsy, which is a brilliant tool to extract dat artifacts from a wide variety of inputs Puppeteer We import all the logs files into Autopsy as Logical Files Select all the ingest modules to run, which analyses the […]

    Chan Jin Hao

    May 21, 2022
    CTF
  • Angstrom Rev Writeups

    I’ve decided to fully focus on Rev and Web for CTFs now, as I find Pwning too magical, and not really “useful” to me. Anyhoo, here are some reversing writeups from Angstrom CTF! Dyn Running the code, we see that it gets the flag as an input Stepping through the code, it tries to unwrap 32 characters, […]

    Chan Jin Hao

    May 6, 2022
    CTF
  • 247CTF

    Here are some writeups for 247CTF, which are mostly web challenges. ACID We’re given a page that has two accounts. You can transfer funds between the two accounts with the parameter ?to=1&from=2&amount=1 To get the flag, you require more than the total available funds at the start, which is 247. If we transfer the funds […]

    Chan Jin Hao

    April 24, 2022
    CTF
  • Midnight Sun CTF Gambler

    This is one of the hardest CTF I’ve been in. My team did really well to qualify for the finals in Sweden, and I wish them all the best as I will not be joining them. The Gambler This was a DotNet binary, we so could use DNSpy to inspect the full source code In […]

    Chan Jin Hao

    April 12, 2022
    CTF
  • Winja CTF Reverse Engineering

    Honestly, this was a very easy CTF rev challenge. One of them had a flaw with there being more than 1 possible flag, while another was straight out leaking the whole flag with ltrace. So this is the only writeup worth writing, even though it was extremely easy Matriarcado Opening the binary, we see that […]

    Chan Jin Hao

    April 12, 2022
    CTF
  • WolvSec CTF: pwning canaries

    Another writeup for a pwn CTF challenge! In this challenge, we need to leak the canary value via format strings, and do a buffer overflow to change the return address to the desired function. The buffer for us to overflow is 16 characters long. It first reads in data with a format string, and prints […]

    Chan Jin Hao

    March 29, 2022
    CTF, Hacking
  • WolvSec CTF

    I briefly participated in a CTF hosted by WolvSec here: https://ctf.wolvseccon.org/. This post is going to be looking at a “Medium” level difficulty Reverse Engineering problem! n33dl3 When we run the file, it prints a single statement, before terminating Firing this binary in Ghidra, we see a deep level of nested function calls, however, they […]

    Chan Jin Hao

    March 28, 2022
    CTF
  • RE: Crackme Guess the Password

    https://crackmes.one/crackme/60906d5833c5d458ce0ec80b I’ve been doing plenty of crackmes as a way to improve my RE skills, although I do stay away from Keygen challenges as I don’t find them particularly interesting. Instead, I’m attempting those that require you to key in a right username or password. This write up is about a pretty interesting and challenging […]

    Chan Jin Hao

    February 7, 2022
    MA/RE
  • FormBook / AgentTesla

    Today we’re gonna look at a sample of FormBook Malware, which contains AgentTesla within it. It features things such as hiding an EXE within an EXE, and installing a persistent backdoor within the system. Source: https://bazaar.abuse.ch/sample/35147128936c2e79548e5c0a2bbd70cd5a29c1b01dfa1ac2515fa5becb7efa6d/#intel First DNSpy Analysis When we run the exe file through DNSpy, it looks to be building a simple form. […]

    Chan Jin Hao

    February 3, 2022
    MA/RE
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