Transformation picoctf writeup. Hacker's Handbook - https://amzn. Now let’s connect to the second server “nc tethys Step 6. 30. It resembles AAA. I then went to /uploads/webshell. First, I tried using binwalk to try and extract files from the picture, but I couldn’t find anything. More content… Rights : PicoCTF Image Width : 2560 Image Height : 1598 Encoding Process : Baseline DCT, Huffman coding Original writeup (https: Apr 25, 2024 · encをテキストエディタで開く。. Web. この問題を解くカギは，ヒントのとおり，ネットでTransformツールを探し当てることだったようだ。. PicoCTF 2022 に参加していました。. This is a standard format string vulnerability. See comments in the solution script for a detailed explanation. Mar 17, 2024 · Solution. Apr 26, 2024 · PicoCTF 2024 SansAlpha Challenge solve This writeup details how I conquered the SansAlpha CTF challenge, which provided a limited keyboard with only numbers and symbols. rsa-crypto polynomial rsa crt rsa-crt polynomials. As hinted in the description, every 3 letter is scrambled. We repeat this process until the { character when we don't know the next character. Hints: Where can you get some letters? Launch the instance and then connect using the given password. When the user chooses option "c", the enter_license function is called. Jeopardy style CTF. Lets save it to a file. svg. Once the tool was installed, we used it like so: We saw in the image above that there where some weird information, in particular in License and Current IPTC Digest. Let's separate message. It is divided into three sections. Apr 4, 2021 · Video Writeup of Get a head (picoCTF) (Tryhackme)Laptop (I use) : https://amzn. net <port> Try entering "getRandomNumber" without the double quotes ==> win 0x70 0x69 0x63 0x6f 0x43 0x54 0x46 0x7b 0x34 0x5f 0x64 0x31 0x34 0x6d 0x30 0x6e 0x64 0x5f 0x31 0x6e 0x5f 0x37 0x68 0x33 0x5f 0x72 0x30 0x75 0x67 0x68 0x5f 0x36 0x65 0x30 0x34 0x34 0x34 0x30 0x64 0x7d Try entering "getRandomNumber" without May 3, 2021 · Nhóm Wanna. Contribute to xnomas/PicoCTF-2021-Writeups development by creating an account on GitHub. This challenge’s description is as follows: Files can always be changed in a secret way. 5. Can you find the flag? # Information. We are therefore going to modify the following header : "Accept-Language" Explanation of the effect of the header And let's put it the following value : Accept-Language: sv,en;q=0. org. According to the challenge description we Saved searches Use saved searches to filter your results more quickly Languages. I then used keyword search with ASCII Mar 20, 2023 · Step 4: Afterwords, I was able to get the password using the cat command on the file “pw. Jun 14, 2021 · Running through the 2021 CMU PicoCTF. After I pressed forward I see an interesting string that looks like a base64 encoded. It is the program that we need to reverse. Problem. This, along with many other Binary Exploitation puzzles are available at play. For that, we have downloaded the tool exiftool ¹ to see the image metadata ². s = "" # open up remote connection. com picoCTF 2021 được tổ chức từ 16/03 đến 31/03 năm 2021 *GENERAL SKILL> tangiang0812 -Tab, Tab, Attack Trước Enhance! by LambdaMamba / m1z0r3. Red 1. A file named enc is provided, along with a Python snippet: ''. Binwalk extracts the zip file and also automatically unzips it and we have a secret directory which also contains flag. >>> chr(ord('灩') >> 8) 'p'. Python 97. Capture The Flag, CTF teams, CTF ratings, CTF archive, CTF writeups. Virtual Machine 1 (300) The enemy has upgraded their mechanical analog computer. Magikarp Ground Mission. Specialer (PicoCTF 2023): Team: The_Dream_Team (6100 points) (160th place global) Description: Reception of Special has been cool to say the least. Solution: The challenge gives us a link to download which download a file named "flag" for us. If you connect them, you can read The_flag_is_picoCT. これを2進数になおして、. for i in range (l): a = ‘0’ + a. PicoCTF 2023 Writeup. Add the two images together to get the flag. 우선 보고 싶지 않은python 코드가 무엇을 하는지 봅시다. BWT. --. join([chr((ord(flag[i]) << 8) + ord(flag[i + 1])) for i in range(0, len(flag), 2)]) Solution. See SUMMARY for list of write-ups. Nov 28, 2021 · So by doing the inverse of the first operation – shifting the Unicode value of our first encoded character 8 bits to the right – we get the following: 1. Reading that file ( cat ppt/slideMasters/hidden) shows Z m x h Z z o g c G l j b 0 N U R n t E M W R f d V 9 r b j B 3 X 3 B w d H N . Capture The Flag (CTF) competitions are cybersecurity events where participants solve challenges across different categories, including cryptography, web exploitation, reverse engineering, forensics, and more. Aug 23, 2021 · picoCTF 2021 Information Writeup. You signed out in another tab or window. CTF writeups, Transformation. 2 min read. to/2PioCay Mar 15, 2023 · Step 1: In this picoCTF, we are searching for information hidden in the image. You switched accounts on another tab or window. enc 안은 찻잔과 같다. I use all the default settings and analyze the raw disk file. net 51785”. Output: Usage: ende. xml. The… Apr 5, 2023 · Apr 5, 2023. Tue, 16 Mar. After that I navigated into the zip folder - The script loops through 2 characters at a time - The script then left shifts the first character left by two bytes: 0xFF becomes 0xFF00 - This is then added to the value of the 2nd character and turned into a character So in order to undo this we need to take each character, take the first 2 bytes and turn that into a character and take the I then wrote the following script to connect to the server and send lots of %x (prints stack) before reading and parsing that to ascii: # import pwntools from pwn import *. net --port 16439 vuln. You signed in with another tab or window. Transformation is a Reverse Engineering puzzle worth 20 points. Feb 15, 2024. The python code in the challenge text is the program used to encode the original flag. -- Problem Description: I wonder what this really is… enc ''. jpg image from the question. CCC with three base 64 encoding chunks. 1 min read · May 14, 2024--Lynguist0. From this point Mar 26, 2024 · Create a new case and name it whatever you want, then add the path to the img file downloaded. Apr 29, 2021 · UTF-16 encoding of two UTF-8 characters Do you want to learn how to solve the Scavenger Hunt challenge in PicoCTF 2021? Check out this webpage for a detailed writeup with screenshots and code snippets. 4%. Jan 23, 2024 · In case you’re unaware, that essentially refers to a javascript token utilized for authentication. to/3cQr1BiMicrophone (I use phone) : https://amzn. I decided to write code to make the program run in reverse new_caesar_reverse_code. x = a [:8] y = a [8:] #convert to character and append to the blank Mar 28, 2023 · Summary My solutions for the challenges I have solved in picoCTF 2023 Forensics hideme Ran zsteg which revealed that there is extra data after the image data ends with a header saying it is a zip archive. InfoSec Write-ups. This is my writeup for Information, a Forensics challenge worth 10 points. There weren't. Feb 15, 2024 · PicoCTF (Writeup) — Transformation | by Zayat | Medium. There is another hint of the first word is a 3 letter word. Python 92. During the competition period, which was held between March 16th, 2021 and March 30th, 2021, I placed 25 out of 2280 ( top 1. Hiding files inside of files really stumped me until I found a video. According to the chat, it will be sent to the port 9002, and to decrypt the file we must run openssl des3 -d -salt -in file Mar 26, 2024 · ssh -p <port> ctf-player@mimas. Ctf. md). The hints gave us more details about the objective of this challenge: Hint 1: Try using burpsuite to intercept requests to capture the flag. Today, I May 31, 2023 · 2 min read. en) of the file flag. Therefore, we can use the first letter to find the value of the second letter. py. HTB Cyber Apocalypse CTF 2024 — Reversing. That's why we made an exclusive version of Special, called Secure Comprehensive Interface for Affecting Linux Empirically Rad, or just 'Specialer'. ## Write up: Looking at the "encryption" used on the flag I noticed a few things. As for the second operation, subtracting the first Apr 27, 2021 · picoCTF 2021 Transformation. Analysis and walkthrough of the challenge "Transformation" (https://play. Running the python script command as such prompts us for the password where we can paste in the password Apr 6, 2023 · The challenges in picoCTF range from basic concepts such as general skills, cryptography and programming to more advanced topics like web exploitation, reverse engineering, binary exploitation, and forensics. if we open the file, we get the following string: this looks like a base64 string, so let’s try and decode it. org/practice/challenge/104) ----- Mar 15, 2023 · I participated in the picoCTF 2023 competition as an individual competing in the Global category, organised by Carnegie Mellon University, which ran from Mar 15 2023 to Mar 29 2023. Super Serial (130 points) Startup Company (180 points) Web Gauntlet 2 (170 points) Web Gauntlet 3 (300 points) Solving. Mọi đóng-góp ý-kiến bọn mình luôn-luôn tiếp nhận qua mail: wannaone. Contribute to LeonGurin/picoCTF-2023 development by creating an account on GitHub. Extracted the data using binwalk with -e to extract. Can you find the flag? cat. These challenges mimic real-world scenarios and test participants' skills in hacking, penetration testing, and problem Solution. Dari pola output yang kita temukan, mulai terbentuk format flag “picoCTF {”. Contribute to 3toe/PicoCTF-Transformation development by creating an account on GitHub. One of the criteria of a one-time pad is that the key is never reused in part or in whole. Then, I wrote the following python script to parse the entire message. Saved searches Use saved searches to filter your results more quickly Write-up for a PicoCTF challenge. I searched for "IEND" and selected the part from "PK" to the end of the file, copied the hex portion and pasted it onto a new file to create a new file. C 6. Here is the result when the images are added together: Oct 13, 2023 · PicoCTF (Writeup) — Transformation. Knowing that the flag follows the format picoCTF{FLAG} , it looks like we’re on the right track. Web Exploitation. To be honest, this challenge needs a bit of an inspiration, but if you replace spaces with underscores (_) and look carefully, you can see the encrypting rules. 2. Follow @CTFtime © 2012 — 2024 CTFtime team. picoCTF 2021 / Tasks / Transformation / Writeup; Transformation by vishnukee3 / v1k1ngs. Jika kita menambahkan path tersebut ke url. My English isn’t good, feel free to read this writeup ~~. Ranked 113th on 6215. It has been a while since I last wrote, but I am excited to get back into it. With Specialer, we really tried to Highly recommended as anyone's first CTF, picoCTF is a traditional challenge-based competition with a two-week annual competition period that rolls into a year-round accessible learning platform. picoCTF 2024 Write-Up. PicoCTF 2023. More content… 12 min read · Mar 28, 2024 Mar 29, 2024 · IntroToBurp challenge. net', 53437 ) # get to vulnerability. Jika kita perhatikan, ada huruf-huruf yang hilang dari flag orisinil, yaitu setiap karakter di urutan genap. c -o vuln and then we can generate a pwntools template using pwn template --host mercury. The portion of the flag we need to find if key_part_dynamic1_trial. Solutions for the 2021 PicoCTF. 0. net Use password: 6dd28e9b. This is a write up of the challenges solved during the event. Maka flag akan muncul. Mar 31, 2023 · picoCTFには1年半ほど前からたまに触っていましたが、リアルタイムのpicoCTFは初参加になります。 今回は研究室のメンバーを誘い、計4人でチームを組み参加しました。結果としては全体で4000pt取ることが出来ました！ Writeup The program contains a variable called key_part_static1_trial that has the first part of the flag: picoCTF{1n_7h3_|<3y_of_. Abdul Issa. Contribute to Cyb3rKat/PicoCTF-Writeup development by creating an account on GitHub. Straight to the point. Shell 2. Apr 7, 2021 · picoCTF 2021 Stonks Writeup. py – d flag. I first needed to revers the function shift. 2021. After seeing that it is of a file-type unrecognized by Windows we can take the hint from the challenge name and try to use the unix "cat" command on it with: Jul 5, 2023 · └─ $ nc saturn. It even tells us that the program is vulnerable to a format string attack when we compile it. One chia sẻ một số Challenges giải được và việc chia sẻ writeup nhằm mục đích giao lưu học thuật. PicoCTFは、というよりも、CTFに参加し始めたのが去年のセキュリティ・キャンプがきっかけだったため、ほとんど全てのCTFに Mar 16, 2021 · PicoCTF2021. our team's writeups for the 2021 PicoCTF competition python3 ende. Download the Image. Sep 17, 2023 · l = 16 — len (a) #if less then add 0s in the beginning. Will be updated with other solutions. When we enter to the link, it shows a page like this: I use Mozilla Firefox to change the HTTP header Mar 26, 2024 · picoCTF 2024 Write-Up. Feb 6, 2023 · In CTF write-ups, PicoCTF Write-ups. Category : Reverse EngineeringCTF : PicoCTF (picoGYM)Books to get started on hacking:1. txt by three characters (3-gram) and decode it. Solution. The flag is there. The… Jul 7, 2022 · Download the corrupted message here. Write-ups for various challenges from the 2021 picoCTF competition. 아마 명문 두 글자를bit로 조합한 것 같습니다. BBB. The significant bug in the otp. It contains value 8 and 9, so it can’t be octal dump. for i in file: shifted += chr (ord (i) >> 8) print (shifted) Output: pcCF1_isis3do__1107. Then, I entered the following command: “python3 ende. 300. This Oct 24, 2022 · After looking at the extension (. Metadata, which is stored within image files, can hold Apr 4, 2024 · Apr 4, 2024. Rating: picoCTF 2022 Enhance! (Forensics 100 points) The challenge is the following, We are also given the file drawing. flag. できなかった問題をwriteup等を参考に勉強した記録を残す。. It asks for a password. As stated in the description, this is a one-time pad challenge. First, open message. テキストエディタで出てきた文字列は結合した16bitsを文字変換したものと思われる。. Jul 2, 2021 · Video Write-up for Transformation. This is my writeup for Stonks, a Binary Exploitation puzzle put out for picoCTF 2021. txt” file, as you can see in the image below. Of course, as everyone knows, bitwise operations are the Bee’s Knees. Tags: picoctf2021#transformation Rating: 1. Dig deep - Look into it. Reload to refresh your session. Stonks was not worth a lot of points compared to other challenges, so I figured it would be easy. py ( -e / -d) [file] Seeing as -e and -d tags that can be used when running the python script we can deduce that the -d tag would decode and we can pass the "flag. picoCTF {Who_D03sN7_L1k5_90B0T5_718c9043} Picoctf. It's easy to guess that the first word is The. Reverse engineer the mechanism and get past their checker program: nc saturn. I opened the file in HxD and it turns out that was exactly what it is. This is the image we get after the file has been downloaded: 2. Last updated at 2021-04-27 Posted at 2021-04-02. Steps : Recon - Finding the base file. I downloaded the file and tried to see if there were any plaintext strings in it. Open the executable in Ghidra and go to the main function. More content… 10. pptm. Transformation. txt which we need to decode. Writeup. At this point we can loop through every printable ascii character, c, and encrypt 'picoCTF{'+c. ): As you can see, the “role,” which at the moment contains the “user” value, is what Dec 20, 2023 · 1. I got the flag. The banner will show a password “My_Passw@rd_@1234”. en" file in as the [file] parameter. 9. Create a string, decoded_flag, to hold the flag's A good start is to follow the TCP streams. if stop >= KEY_LEN: stop = stop % KEY_LEN key = kf May 14, 2022 · SOLUTION: So, after running this command, it outputs some integer dump. This approach can be seen in the solution script. ; Hint 2: Try mangling the request, maybe their server-side code doesn’t handle malformed requests very well. join([chr((ord(flag[i]) << Aug 23, 2021 · picoCTF 2021 Transformation Writeup. When we open up the challenge we see: When we get to the link we see a classic Jan 15, 2023 · Setelah saya decode teks tersebut pada terminal, didapatkan sebuah domain path. Participants can earn points by solving challenges, and the competition typically lasts for more than a week. Category: Forensics AUTHOR: SUSIE ## Description ``` Files can always be changed in a secret way. May 31, 2023. Mar 27, 2024 · Solution: Connecting to the first server “telnet tethys. the result would be this: However, the result still looks like a base64 Oct 1, 2023 · Transformation writeup — picoCTF. xnomas. This is a challenge from PicoCTF 2021 which exploits the HTTP Header. I stored the value in the question in the variable enc and as the key could have been any character from a to p, I decided to create a list named b16 so that I can convert the encryption for all possible keys. OSINT. We’ll be at bash shell Jul 4, 2022 · picoCTF 2024 Write-Up Today, I’m bringing you a casual write-up, just trying to stay in the game and get in some practice since I’m a bit rusty. You could simply use cyberchef on the magic setting, and get the flag picoCTF{16_bits_inst34d_of_8_e141a0f7} </br>. 2%. jpg ``` ## The image Read writeup. # string to write to. en”, and I was prompted to insert the password stored in “pw. On April 7, 2021 By Daniel In CTF. PicoCTF. cat enc: 灩捯䍔䙻ㄶ形楴獟楮獴㌴摟潦弸弲㘶㠴挲ぽ. png. EXIF (Exchangeable Image File Format) information provides metadata embedded within digital images, including details such as camera settings, date and time of capture, GPS coordinates, and more. Start an instance to begin. 2021 — Tue, 30 Mar. 全てを放置してすいません。. en we can conclude that it is an encoded version of the flag. I decided to view the contents of the file using, $ strings drawing. txt. I wonder what this really is enc ''. Sep 16, 2022 · For my first writeup, I chose the Reverse Engineering Transformation challenge (the link won’t resolve unless you’re logged in) from picoCTF 2021 because of its use of bitwise operations. Today, I’m bringing you a casual write-up, just trying to stay in the game and get in some practice since I’m a bit rusty. The first hint was to look at the details of the file. Digital images often contain more information than what is visible to the naked eye. In this challenge, we will utilize a utility to extract metadata from an image file and use Base64 decoding to reveal the hidden flag. We grabbed this design doc from enemy servers: Download. txt”. A guide and my explanation on how I solved the transformation CTF - GitHub - awebb1/picoCTF-Transformation-Write-Up: A guide and my explanation on how I solved the transformation CTF Saved searches Use saved searches to filter your results more quickly Capture The Flag, CTF teams, CTF ratings, CTF archive, CTF writeups May 4, 2022 · Writeup放置してすいません。. Mar 25, 2024 · Transformation writeup — picoCTF. r = remote( 'mercury. picoctf. It's Not My Fault 1. We can modify the program so that it does not meet this requirement. \n. print ( chr ( ord (flag[i])>> 8 ), end= "" ) print ( chr ( int (bin( ord (flag[i]))[ 9 :], 2 )),end= "" ) The flag is converted to another string consisting of 16-bit characters of half the length from original size, after doing some research and searching for the correct python functions, I thought that what I needed to do was # picoCTF Transformation Write Up ## Details: Points: 20. To do this, in the menubar select analyze --> follow --> TCP Stream. 2 min read Today, I’m bringing you a casual write-up, just trying to stay in the game and get in some practice since I’m a bit rusty. I used this site to find the strings inside the file. 1%) among US Middle/High School students (who solved at least one challenge) as a solo player with a score of 5440 points. Extract Information. Looking through the extracted files, ppt/slideMasters/hidden looks suspicious. It look to us like Apr 3, 2023 · I tried to log in again and get the login request, And I pressed forward to log in through BurpSuite. #divide into 2 parts of 8 bit. In the very first stream, we find a chat conversation between two people, discussing a "secret" file transfer. picoCTF Transformation writeup "이게 진짜 뭘까"라는 말과 함께enc 이 파일과 psyhon 코드와 유사한 코드를 제공합니다. You can also find writeups for other web exploitation challenges and more on this website. 問題文のプログラムは、flagを2文字ずつとって、bitで結合させているらしい。. The original code shifts the first letter to the left and then adds the unicode value of the second letter. PicoCTF: Information write-up. 3%. Follow. 8%. One of the easiest and first checks I do is to read the image metadata with tools such as ExifTool. Writeups for PicoCTF 2021. More content… Apr 1, 2023 · When you run the file command on the downloaded file we can see it is executable. Extract the PowerPoint presentation as a ZIP file, since PowerPoint files are actually ZIPs: unzip Forensics\ is\ fun. to Make sure to submit the flag as picoCTF{XXXXX} Approach. JWTs are divided into three sections, denoted by dots (. これを上下8bitsずつに分け、文字 Approach. Introduction. com/xnomas/PicoCTF-2021-Writeups/blob/main/Transformation/README. Transformation | PicoCTF-2021 Writeup. uit@gmail. Ctf Writeup. We know that the rotation of the red axle is input and the rotation of the blue axle is output. $ nc Apr 2, 2024 · Source: picoCTF 2024. On August 23, 2021 By Daniel In CTF. The “login” 100 point web exploitation challenge is a deceiving on that tripped me up for a bit. First, we download the cat. join([chr((ord(flag[i]) << 8) + ord(flag[i + 1])) for i in range(0, len(flag), 2)]) enc. py script appears on lines 34-36: Copy. The resouce line looks promising. ( CTF TIME) PicoCTFは始めての参加です。. Specialer. ·. writeups for picoCTF 2023. php and got a command-line interface to execute commands. It gave the contents of information. You need to authenticate and join a team to post writeups. PicoCTF 2024 SansAlpha Challenge solve This writeup details how I conquered the SansAlpha CTF challenge, which provided a limited keyboard with only numbers and symbols. Finally we arrive on this page: He wants us to speak Swedish to be able to access the last part. 1. Run chmod +x on the file and run the executable. All tasks and writeups are copyrighted by their respective authors. Or use this: Original writeup (https://github. It calls check_key with the user provided key (the flag) and bUsername_trial Mar 26, 2024 · These steps are enough for me to successfully upload the web shell onto the website. But if we run We can then remove E1('p') from E1('pi') to obtain the representation of E1('i') that is in the encrypted flag. cryptography. in. picoctf Apr 7, 2023 · Today, I’m bringing you a casual write-up, just trying to stay in the game and get in some practice since I’m a bit rusty. CTF. We can compile the c source code using gcc -g -m32 vuln. Zayat. May 14. We reverse the encoding mechanism, then try the possible offsets, and print the possible flags. Octal value have value from 0 to 7. qq je rb ji jz pe cf fg mn nf