GHIDRA for Reverse Engineering (PicoCTF 2022 #42 'bbbloat')

[@micleh]

Liked that one, since it is an easy example of how to disassemble code and make sense of what is readable. Perfect as a beginner tutorial.

[@sk0r]

I’ll be honest, a lot of your videos I have no idea what you are doing, but I enjoy watching you and your skill set and what is possible with the right tools. 🙏

[@deltabytes]

I like the way you take us through step by step. I am learning a lot from these videos.

[@arr3business939]

same

[@MikeDSutton]

In case anyone else was curious what the 'unscramble_flag' function did, here's the rough equivelent in Python 3: bytes([ b + (0x2F if b < 0x50 else -0x2F) for b in bytes([ 0x41, 0x3a, 0x34, 0x40, 0x72, 0x25, 0x75, 0x4c, 0x34, 0x46, 0x66, 0x30, 0x66, 0x39, 0x62, 0x30, 0x33, 0x3d, 0x5f, 0x63, 0x66, 0x30, 0x62, 0x65, 0x35, 0x35, 0x62, 0x60, 0x65, 0x32, 0x4e ]) ])

[@Lampe2020]

I first saw the code then the description you gave but I immediately recognized it as Python3-code because two of my last three Python3-projects involved exactly that, converting lists of numbers between 0x00 and 0xff to byte strings (`bytes` object) XD

[@WorldAquariumSingapore]

super and i am 2 years late watching your vid

[@The_Scene826]

Great video! Your walkthrough on using Ghidra for reverse engineering was incredibly helpful. I was able to solve a CTF challenge and find the flag thanks to your detailed instructions. Keep up the excellent work!

[@tpai302]

I'm so bad at RE but love watching others do it so I can pick up on little things each time.

[@jackscalibur]

Hey! Do you feel like you're better at it now?

[@domzzy6432]

Are you good at it now?

[@11ph22il]

These videos are the spam I like to get, each one with GREAT info on CTFs. Thanks John!

[@Riiveri]

I have no idea why KZbin decided to recommend me these videos but I'm glad it did. This is awesome!

[@vivarantx]

same here, I was watching people eating 30 bags of cheetos and I ended up here

[@kiizuha]

@@vivarantx lmao

[@kadericketts9218]

Been loving the PICO CTF videos you’ve been making have watch most of them and have been learning a lot as i am just a noob in IT

[@kevinalexander4959]

Would love to see a video on rebasing. I have a hard time with alignment using strings. Would love a newbie friendly of you rebasing binaries that do not align in disassembler. thanks!!

[@HyBlock]

couldn't this be done in some other way, my feed is filled with all those uploads making it harder to browse, don't wanna unsubscribe cus I appreciate your work though!

[@TheJustinist]

Yep, unsubbed

[@KoskiK]

Quite the same, after the first burst of videos I figured it was just a mistake or an error with the scheduler. After this new one I unsubbed unfortunately, as I enjoyed the content. KZbin should by now have made a limit, say 3 posts of a single person in the sub feed.

[@ocoolwow]

@@KoskiK ah that would actually assume that KZbin would output usable work

[@zdrasbuytye]

You can do reverse engineering with the Linux shell only .

[@FakeMichau]

KZbin after seeing so many uploads: i'm gonna end this man's whole career

[@kr4k3nn]

This is my first time seeing Reverse Engineering. I am like WOW, this is so fun to watch & do. THanks John for introducing this very interesting things to us. :)

[@Dex_Lulz]

The more spend I time on your channel the more I learn.

[@DevBranch]

Thank you for making these videos! I'm new to this, so being able to see how this works first-hand is extremely helpful.

[@HYPR.trophy]

I appreciate hearing your thought process as you go through the challenge

[@hardelectrolove]

Did you just accidentally release every video for the next weeks/months at once? Holy moly, that's a lot of stuff in my Watch Later playlist now! x)

[@VA3KAMA3]

same. just have had a marathon watching them

[@theamazingjay161]

Okay, so I'm not the only one.

[@cod4volume]

As far as open source content goes, John, you’re an OG. A goat. Appreciate the content and knowledge dude, stay humble.

[@1234enzor]

A flashback and relearning TY!

[@claytonautoshmotive]

First of all, you're incredibly talented and even though I only comprehend bytes here and there its always interesting to follow along. My limited experience in reversing all took place in Olly x64/32 and recently hit a wall with some software for an automotive interface i paid good money for several years ago.. the mfgr ended support for it so theyre no longer supplying the updated "launcher" software that basically hijacks the proprietary diagnostic platform for the Blue Oval. The magic happens during the app startup process as long as the interface is connected to the car and the laptop via prolific serial over usb cable. Im not sure how to get olly to follow this process since the launcher software only exists to launch the official application without those pesky license requirements. I really just want to edit the last launcher update i got to get it to load the newer version of the main application. serval sources have figured it out and charge for their Re-Hack of the Hacked app and i would rather make the adjustments myself if i can just get started in the right direction. long winded sorry, its a simple (ish) app thats strangely hard to describe in a short and sweet mannor lol. how can i get a good breakdown of what its doing? TIA

[@P-G-77]

Love this intricate logic tricks.

[@ThomasAbraham-s6v]

Man u r DANGEROUS! lol 🙃☺ keep ur great work up dude! 💪

[@sem8973]

This would have been a perfect intro tutorial to reverse engineering with Ghidra

[@DanjumaMuhammad]

I like the term "low-hanging fruit 🍓" 😊

[@iamtimsson]

oh look a user agreement, "i agree" never to be thought of again

[@lancemarchetti8673]

Hi John, can you please review "angr" for us. I don't have a clue where to start...lol

[@yttos7358]

Another way of converting from hex to decimal is with the `printf` command which can be found on any linux system; use `printf %d 0xc0ffee` to see

[@inazumaeleven9102]

I like the fact that in each ctf videos, I learn new tools to use for hacking. Now I check the bell icon. Keep on going man, u the best

[@ronorocky]

i just love you man,you are just awesome....... hope someday i will meet u in person.... u r doing a great job... keep it up. ❤️❤️

[@SamoCoder]

This was interesting. Liked and subscribed.

[@WayneModz]

I guess its kinda good you didn't have the environment requirements preinstalled

[@makayjozsef]

You can use "apt search" too for package searching

[@lancemarchetti8673]

agreed

[@aurelienlevra3782]

Great video

[@for14556]

Very nice video about rev, thx.

[@znucii]

MAHYOUB WE MISS YOU

[@hvacinstalacije1985]

Can you decode and file from ECU which usually .bin file, how we will be able to find the maps for tuning for new ECU

[@KGAD0831]

I really liked this one.

[@SpencerNold]

Headless for Java means its stripped of mouse and keyboard input libraries and whatnot. Badly breaks java swing, so you probably don't want to use that.

[@Lampe2020]

The word "Bbbbbbbloat" is a bloated word and has the same effect as a mass of bloatware has on a PC: it works, but slower.

[@hh7xf]

you should also check out cutter

[@mytechnotalent]

Love me some Ghidra!

[@victorkuria4734]

Great stuff

[@ancestrall794]

Awesome bro

[@m4rt_]

<a href="#" class="seekto" data-time="380">6:20</a> (sdkman is a good tool for downloading java stuff)

[@ashokshastri9101]

Sir big fan of yours from Lamatol village, golbazar-06 municipality, siraha district, sagarmatha zone, Madhesh Pradhesh (province no 2), nepal 🇳🇵

[@TheofilosMouratidis]

at <a href="#" class="seekto" data-time="806">13:26</a> you already got the decimal by hovering over the number

[@MrLetsGamePlayHD]

In ghidra you can also change the display type

[@bkib]

Nice!

[@heisenberg8055]

TF I just watched! Interesting

[@codedsprit]

I wish I had a nice laptop like yours 🥺

[@krishanuchhabra]

Nice one

[@abiodun6897]

i got it 🙋🏾‍♂️. where can i learn this reverse engineering

[@superfish4603]

There are 11 hidden videos in the playlist, when do we get them? :)

[@msalih]

Awesome

[@gogogg91]

Awesome!

[@tech-wandeveloper7495]

That was cool man!

[@skeeberk.h.4396]

Very Nice

[@tlocto]

can't wait till you go over noted, was my favorite one

[@untitled8027]

nice

[@wonderweissmargela4261]

Easy with the upload sir

[@Itsmeattacker]

hello sir your videos are great it helped me for solving and understanding all the ctfs of thm

[@MisterK-YT]

John can you post the code that formats your bash (or zsh) prompt? From your .bashrc or wtvr config file. I like that two-line prompt.

[@Mathcartney]

Its zsh the shell that he uses, it isn’t bash. And the theme is the default kali theme. There are many other custom themes and wrappers such as powerlevel10k if you dig it deeper tho

[@cryproot9845]

It's a good video

[@polinimalossi8404]

but you can make the same video with the imusic aimersoft program?

[@leblanc666666]

nice and simple, but fun nonetheless! Does picoCTF have have challenges that are more based on web applications?

[@iKilleasy007]

picoCTF has a web exploitation category

[@MygenteTV]

wtf, this is weird I had been watching your videos and even follow you in LinkedIn for years and just found out I wasn't subscribed to your channel. KZbin be playing tricks, they welcome you with your favorite channel for ever and you will never know you weren't subscribed because everytime you open youtube and see the same person there you automatically think you are subscribed

[@pitust]

process or RE with binary ninja: step 1: load the binary. step 2: see the number in plain text from the decompiler. step 3: profit

[@Bromon655]

What is the Linux wizardry… dude was flying through the terminal like nobody’s business

[@2b2tJourney]

Wait this is intresting

[@wahabwahab2042]

im watching your video and honestly i'm 80% didn't understand what are you doing exactly. i wonder what level is that ? im sure it is advanced level . where to start to achieve your level ??

[@noodlechan_]

what if we reverse engineer Ghidra binarys using GHidra?

[@Bowzerbro]

👍

[@saranvishva7982]

what will happen if I swap the iF and else condition

[@tribblewing]

My etc/apt/sources.list is using Kali Linux's default repo, but I can only install strace. ltrace keeps getting an error: "Unable to locate package". Has anyone figured out a working alternative repo?

[@passaronegro349]

...would it be possible to have subtitles in Portuguese ???

[@mideno7619]

Sup

[@JessicaMerry-f1i]

Please 🙏 sir can I use this to do reverse engineering on my mobile app??? Can someone help me out

[@mikerich5003]

Has anyone on bohemia has their initial deposit asst changed..

[@aaravinthan001]

Bro it is possible to convert intel hex to c code using this

[@AliYar-Khan]

Can we reverse engineer malware and then remove them this way ?

[@bmbiz]

That's pretty much the _only_ way to remove previously unknown malware: reverse engineer it, figure out all changes it makes and then undo all those changes on an infected system.

[@SultanSaadat]

can you send us your shell modifications? This looks so cool.

[@ocoolwow]

You gotta stop man, this is flooding my sub box

[@vinnie3265]

Everytime I Try to run a binary file on my kali linux I am getting exec format error...so I am not able to solve any rev engineering problems....can someone plss help with it🙏🙏🙏🙏

[@WaseemLaghari]

I solve it by viewing your video but you did it late by looking for other stuffs. Maybe you do to let us all understand everything

[@utensilapparatus8692]

John 1337 the king

[@metsfaninct]

Man, nothing like getting spammed. Should have spaced it out.

[@ultimultig]

cool but i didn't understand a single word said in this video

[@MisterK-YT]

Question: why didn’t he “trust” the Ghidra from the official Kali repo? Why go through the process of installing manually??

[@SheIITear]

Stuff from the repos on your distro tend/might be really old. In case of ghidra you just download and extract it so thats the fastest way to get the latest.

[@MisterK-YT]

@@SheIITear noted! Thanks!

[@vaisakh_km]

I wanted to ask same. I thought it might be the reason but to make sure... Is that a problem with distros like fedora or arch!?... those are more up to date than Debi an right!?

[@roachxyz]

What is this stuff called? Cybersecurity?

[@NexushasTaken]

its already in the video title.

[@marcoamendoza5283]

Does anyone have the bbbblob file to try it out?

[@KirwinWebb]

You seemed disappointed that you got the flag so quickly.

[@patrickborys3490]

ez

[@MasterRg-cj7tt]

Hi , I am new PicoCTF . and i try to solve that for practice if i cant i am looking for in google for solving . But I cant find picoCTF notepad Author: ginkoid . Can you help me? How can i solve that

[@afrkleaks4991]

I do not have time with all these load it opens this read there and there then crack it i refuse all these stuff at the end you have to find the way to get in to the software, easy ways quickly just load malware to infect

[@BigWin24410]

Is this the apparently kid all grown up?

[@anujsrivastav6444]

Hey jhon can you please tell me how I can trace the memory leak from heapdump file?

[@CodyHoskin]

Have you ever got a live virus on your own system? Or a RAT?

[@BissmadoOuallaliux]

صعب جدا

[@kraemrz]

Yt algo

[@bohu3741]

its too simple