Code of The Day

Cyber Security, Software Engineering, and sometimes, Life

  • HTB Boxes
  • CTF
  • Security
  • MA/RE
  • Engineering
  • Book Review
  • Life
  • LinkedIn
  • GitHub
  • 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
  • Ave Maria RAT (Loader?)

    The sample we’re analyzing is part of the Ave Maria RAT malware family, but judging from it’s simple functions, perhaps it’s simply a loader to download the more complete malware. The file disguises itself as a PDF file with the icon, but in actuality, it’s a .NET program. We fire up DNSpy and load it […]

    Chan Jin Hao

    January 31, 2022
    MA/RE
  • RE Series #10: LockBit ELF

    After doing a substantial amount of RE challenges, I decided to analyze real Malware to see if what I’ve learnt is actually useful, and I have to say, I think it really helped! In this post, I’ll be dissecting the initial portions of the Linux variant of LockBit. Basic Information The binary on its own […]

    Chan Jin Hao

    January 28, 2022
    MA/RE
  • RE Series #9: HTB Headache2

    Before we start, this will probably be the last RE Series from HTB, as I’ve completed almost all of the RE challenges on HTB. Almost, because some of them has trouble running on my machine, and I’m honestly too lazy to fix broken challenges. I’ll probably now pivot towards analyzing real-life malware, and hopefully what […]

    Chan Jin Hao

    January 25, 2022
    MA/RE
  • RE Series #8: CrackThis!

    An interesting challenge with a tricky obfuscator. Honestly, once the code has been de-obfuscated, it’s quite straight forward! Static Analysis Running it through Exeinfo, we see that the binary has been packed with ConfuserEx. The hardest part actually is finding the deobfuscator Opening the binary with DNSpy, this is what the obfuscated version looks like: […]

    Chan Jin Hao

    January 25, 2022
    MA/RE
  • RE Series #7: HTB Find The Secret Flag

    A fun CTF that has unreachable code, although I wonder how practical this is in real life! Static Analysis with Ghidra We throw the binary into Ghidra to analyze the main function It’s pretty complicated. On line 13, its creating a value based off srand() from iVar2 On line 15, it checks if there are […]

    Chan Jin Hao

    January 24, 2022
    MA/RE
  • RE Series #6: HTB Headache

    My first Insane challenge, and I’m glad I solved it. Binary Analysis Running some simple analysis, we see that the binary prompts us for a password, it’s a stripped binary, dynamically linked, and curiously ltrace fails immediately. Dynamic Analysis with IDA As we step through the function, we get to the part where it calls […]

    Chan Jin Hao

    January 20, 2022
    MA/RE
  • RE Series #5: exrs 1-7

    A write up for the challenges posted here: https://github.com/wapiflapi/exrs I’ve only done r1-r7, and I’ve yet to do r8 and r9 R1 As straight forward as running “strings” on the binary R2 Some dynamic analysis is involved. We run the program through IDA, and breakpoint at the string comparison to see what it’s comparing to […]

    Chan Jin Hao

    January 20, 2022
    MA/RE
  • Exercised

    Throughout my life, I’ve always maintained health to be of paramount importance, even surpassing career aspirations as a need. A healthy body predicates a healthy mind, which is the ultimate derivative of everything else. Even though I would self-proclaim to be knowledgeable about most things fitness, this book has expanded my knowledge even more, which […]

    Chan Jin Hao

    January 19, 2022
    Book Review
Previous Page
1 2 3 4 … 13
Next Page

Proudly Powered by WordPress

  • Follow Following
    • Code of The Day
    • Join 27 other followers
    • Already have a WordPress.com account? Log in now.
    • Code of The Day
    • Edit Site
    • Follow Following
    • Sign up
    • Log in
    • Report this content
    • View site in Reader
    • Manage subscriptions
    • Collapse this bar