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. 🙏
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 ]) ])
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
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!
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!
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. UA-cam should by now have made a limit, say 3 posts of a single person in the sub feed.
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. :)
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!!
I think if you just made it so the instead of if it equals the hexadecimal, does not equal that, then run the program, and any number will give you the flag.
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
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.
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?
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
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🙏🙏🙏🙏
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.
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 ??
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. UA-cam 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
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
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
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.
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!?
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.
I like the way you take us through step by step. I am learning a lot from these videos.
same
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. 🙏
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 ])
])
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
These videos are the spam I like to get, each one with GREAT info on CTFs.
Thanks John!
I'm so bad at RE but love watching others do it so I can pick up on little things each time.
Hey! Do you feel like you're better at it now?
Are you good at it now?
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!
I have no idea why UA-cam decided to recommend me these videos but I'm glad it did. This is awesome!
same here, I was watching people eating 30 bags of cheetos and I ended up here
@@vivarantx lmao
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
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)
same. just have had a marathon watching them
Okay, so I'm not the only one.
Thank you for making these videos! I'm new to this, so being able to see how this works first-hand is extremely helpful.
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!
Yep, unsubbed
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. UA-cam should by now have made a limit, say 3 posts of a single person in the sub feed.
@@KoskiK ah that would actually assume that UA-cam would output usable work
You can do reverse engineering with the Linux shell only .
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. :)
Love this intricate logic tricks.
UA-cam after seeing so many uploads: i'm gonna end this man's whole career
The more spend I time on your channel the more I learn.
super and i am 2 years late watching your vid
Man u r DANGEROUS! lol 🙃☺ keep ur great work up dude! 💪
A flashback and relearning TY!
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!!
I think if you just made it so the instead of if it equals the hexadecimal, does not equal that, then run the program, and any number will give you the flag.
This was interesting. Liked and subscribed.
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. ❤️❤️
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
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
Very nice video about rev, thx.
Hi John, can you please review "angr" for us. I don't have a clue where to start...lol
I like the term "low-hanging fruit 🍓" 😊
I really liked this one.
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
I appreciate hearing your thought process as you go through the challenge
at 13:26 you already got the decimal by hovering over the number
In ghidra you can also change the display type
That was cool man!
Great video
Love me some Ghidra!
You can use "apt search" too for package searching
agreed
Awesome bro
There are 11 hidden videos in the playlist, when do we get them? :)
Great stuff
Nice!
but you can make the same video with the imusic aimersoft program?
This would have been a perfect intro tutorial to reverse engineering with Ghidra
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
6:20 (sdkman is a good tool for downloading java stuff)
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.
Awesome!
Awesome
TF I just watched! Interesting
you should also check out cutter
Nice one
Easy with the upload sir
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?
I wish I had a nice laptop like yours 🥺
Sir big fan of yours from Lamatol village, golbazar-06 municipality, siraha district, sagarmatha zone, Madhesh Pradhesh (province no 2), nepal 🇳🇵
As far as open source content goes, John, you’re an OG. A goat. Appreciate the content and knowledge dude, stay humble.
I guess its kinda good you didn't have the environment requirements preinstalled
Very Nice
Please 🙏 sir can I use this to do reverse engineering on my mobile app??? Can someone help me out
what will happen if I swap the iF and else condition
what if we reverse engineer Ghidra binarys using GHidra?
i got it 🙋🏾♂️. where can i learn this reverse engineering
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.
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.
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
oh look a user agreement, "i agree"
never to be thought of again
...would it be possible to have subtitles in Portuguese ???
MAHYOUB WE MISS YOU
It's a good video
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🙏🙏🙏🙏
hello sir your videos are great it helped me for solving and understanding all the ctfs of thm
Can we reverse engineer malware and then remove them this way ?
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.
Has anyone on bohemia has their initial deposit asst changed..
nice
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 ??
Bro it is possible to convert intel hex to c code using this
What is this stuff called? Cybersecurity?
its already in the video title.
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. UA-cam 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
can't wait till you go over noted, was my favorite one
nice and simple, but fun nonetheless!
Does picoCTF have have challenges that are more based on web applications?
picoCTF has a web exploitation category
Wait this is intresting
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
What is the Linux wizardry… dude was flying through the terminal like nobody’s business
Does anyone have the bbbblob file to try it out?
👍
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
Question: why didn’t he “trust” the Ghidra from the official Kali repo? Why go through the process of installing manually??
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.
@@SheIITear noted! Thanks!
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!?
cool but i didn't understand a single word said in this video
can you send us your shell modifications? This looks so cool.
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
Man, nothing like getting spammed. Should have spaced it out.
Sup
ez
You seemed disappointed that you got the flag so quickly.
Is this the apparently kid all grown up?
John 1337 the king
You gotta stop man, this is flooding my sub box
Have you ever got a live virus on your own system? Or a RAT?
Hey jhon can you please tell me how I can trace the memory leak from heapdump file?
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
Yt algo
صعب جدا