How could this happen? will you help her to find the flag? This CTF ran for eactly 24 hrs and we had easy, medium and hard challenges. FLAG. Therefore, I changed the permissions to 400 using. The first thing we need to do is to identify the operative system in order to properly analyzed the live memory adquistion. I also confirmed using Autopsy, and saw that this private key file was in /root/.ssh/id_ed25519 in the Linux partition that starts at 0000206848. note : please read every line because its necessary to understand whats going on and how i thought threw the challs ! After that, find the passHash in the dump. I wanted to check if there were any strings that could hint to a flag file, so I checked for the string flag using. Use strings command to locate the flag. HSCTF 6 CTF Writeups. And we need answers to some questions that follow, this would be your first assignment! I applied the bt-dht filter, and looked through the packets, and saw that some contained info_hash. so i looked closely and saw that so many numbers werent of 8 bytes . Much appreciated. Now he cant even open his default music folder to hear some good musics! Updated on Oct 16, My picoCTF 2022 writeups are broken up into the following sections, This write-up only covers the memory forensics portion, but the whole CTF is available to play as of the publication of this post. well looking in all these files will take so long so why dont we find if there is something that clue us about the file . This challenge is oriented to students, due to that reason I could not participate. Maximum possible values are +255 to -256 (they are 9-bit quantities, two's complement). So, all credits go to this youtube video. I renamed it to flag4.xz and I extracted it using. 9 min read. we officially hunted down all those three malwares ! The challenge makes easiest the process of finding container but in a real scenario, you could be able to have some evidence with encrypted containers. If lambdamamba is not suspended, they can still re-publish their posts from their dashboard. As for this kind of challenges i use autopsy ! For this task, you have to look really deep. Yaknet 2. Then I used the binwalk to extract the ar archive. We got another image inside 3.png. Thanks for keeping DEV Community safe. There is the flag shown in the screenshot below. The challenge only wants us to find the file name, and not reconstruct the file, so I knew that this info_hash information will be very important because it tells us the hash of the file. We have found traces of yet another malware! We can see that the Truecrypt container was opened and mounted the 20201011. Typical values for deltaX and deltaY are one or two for slow movement, and perhaps 20 for very fast movement. so the first idea i got is to start looking in emails and reports that autopsy grabbed for us ( man i love that tool ) . which gave me this . $ strings -t d disk.flag.img | grep -iE "pico". This shows that 48390510 takes the longest, therefore I will be using this for the eighth test batch. Given this memory dump, we will use Volatility to proceed. were getting selected. First of all, lets check the hidden files using the binwalk. This CTF ran from July 7, 2017 to July 8, 2017. There were files that contained OPENSSH PRIVATE KEY, so now I have to find the actual contents of the private key file. [Link: https://ctflearn.com/challenge/104]. This created a file called flag3, and revealed that it was a LZIP compressed data. No binwalk or steghide for this task, just a normal stereogram. I checked the file type of flag, and revealed that it was a lzip compressed data. i opened the image and while its scaning it was there some really juicy information we can notice in the results section . the last 4 hours, we didn't well managed our time ! Thanks for reading. So we have just to spot where can the timezonesinfo would be . Located in the northern part of the country, it is the administrative centre of Pleven Province, as well as of the subordinate Pleven municipality. $ volatility -f memdump.raw imageinfo Volatility Foundation Volatility Framework 2.6 INFO : volatility.debug : Determining profile based on KDBG search . Just select the container, specify the password, and remember to check TrueCrypt Mode, because it is a Truecrypt container. Follow my twitter for latest update, If you like this post, consider a small donation. I used the offset 114562048 and did the operations similar to Sleuthkit Apprentice to find the file contents using the commands, $ ifind -f ext4 -o 206848 -d 8453 disk.img. To automate this process, I made the following shell script auto.sh. . And thats all, hope you like the Write-Up ;). Learn on the go with our new app. Make sure you have selected the thread. flag : zh3r0{C:\Users\zh3r0\Documents\Hades.exe}, Chall name : Run Forrest RunChall description : Just like one other malware you found, we found traces of another malware which is able to start itself without user intervention, but this time we have no idea or info on when it starts or what triggers it, we only know that it runs automatically! This showed the full command. Lets do a quick start. I looked through a few more, and I was at packet 51080 which had a hash value of e2467cbf021192c241367b892230dc1e05c0580e. This shows that 48390500 takes the longest, therefore I will be using this for the seventh test batch. The extracted folder contained a file called flag. Chall description : MR.Zh3r0 is a mathematician who loves what he does, he loves music and of course he is really good with personal desktops but a really gullible person who could be phished or scammed easily! By checking the file type, it is a data file instead of a jpeg. If we open Readme.txt we can see that they are looking for the password associated with the IP: 48.37.29.153. I inputted this Linux partition size to the remote access checker program, which gave me the flag. Badsud0 Capture the flag team leader ,TUN. Our first task is to find one of the picture and XOR it to find another image. with some research I found that it a type of data encoding and can be solved by replacing some hex value with 1 and rest with 0 , which will give a binary and hence flag.I wrote a python file which will convert '\t' or 0x09 to "1" and " " or 0x20 to "0".and removed remaining others . So, I'm going to do more bundle walkthrough on the CTFLearn. This will let us know whats processes were running in the system. Register for the much-awaited virtual cybersecurity conference #IWCON2022: https://iwcon.live/. However, nothing useful came up. Without thinking twice, extract all the files with the following command. The most interesting process to lookup is TrueCrypt. Forensics (Solved 13/13) Since the flag format is picoCTF{xxx}, I decided to search for the string pico using. As the title suggested, the distorted image is somehow XOR between 2 pictures. after some searching i found out that internet explorer saves some good info in this file so why dont i take look . Having a RAM acquisition can give us a lot of information in a digital forensics investigation. I saw that some texts were covered in black highlight, so I opened it up on Word and changed the text color of the highlighted words to red, which revealed the flag. This created a file called flag3.out, and revealed that it was a XZ compressed data. FLAG : csictf{7h47_15_h0w_y0u_c4n_83c0m3_1nv151813}. Using this password we should be able to open the container but we can retrieve more info and a master key using truecryptmaster. Best NordVPN discount from Flicks And The City, {UPDATE} Ears Jeopardy Match Hack Free Resources Generator, The Wrap Protocol from Bender Labs is Launching: Heres What You Need to Know, Prison officer smuggled panties for prisoner, ./volatility_2.6 -f evidencias/snap.vmem imageinfo, ./volatility_2.6 -f evidencias/snap.vmem --profile WinXPSP2x86 pstree, ./volatility_2.6 -f evidencias/snap.vmem --profile WinXPSP2x86 truecryptsummary, ./volatility_2.6 -f evidencias/snap.vmem --profile WinXPSP2x86 truecryptpassphrase, ./volatility_2.6 -f evidencias/snap.vmem --profile WinXPSP2x86 truecryptmaster, we have a real case where the suspect used Truecrypt. Opening this up on Wireshark showed the following, I decided to Follow TCP stream, which revealed the flag. Challenge 1 So I went to /root/my_folder directory, and I saw that flag.txt did not contain any relevant information because it was shredded. I Googled this, and saw that it corresponded to ubuntu-19.10-desktop-amd64.iso from LinuxTracker.org. Hello there, another welcome to another CTFlearn write-up. so by entering the files of the system we play arround in somefiles until we stamp by a file name called TimeZonesInformation and with it were pleased with the author name : Cicada3310. The second file is a list of users and password in XML format. and divided 19644459 by the block size 1024 bytes using. Solution. 1) 07601 Link: https://ctflearn.com/challenge/97 This one is simple. Now I know what file I am supposed to look for and what directory and partition it was in. We are also given the file Financial_Report_for_ABC_Labs.pdf. Just looking for the IP will give us the password, V8M0VH. He has called the Worlds best forensics experts to come to his rescue! If you have found out all the other flags then this one would be easy for you, this is a test of how much you know about forensics and where to look at properly! So I looked into flag.uni.txt, which contained the flag. Now running command in terminal. Hello Everyone, I am a member of zh3r0 CTF team. and also by how i solved it so fast cuz it was written as a note thats why notes are important ! DEV Community A constructive and inclusive social network for software developers. 1. flag : zh3r0{C:\windows\Program Files(x86)\Anubis.exe}. And We have a suspicion if he only downloaded one malware or more than one? This created a file called flag.out, and revealed that it was a LZ4 compressed data. We are also given the file drawing.flag.svg. So I copied this file into a file with a .sh extension. well for the previous challs we just used 2 reports that have such a juicy data and we didnt have the chance to cmplete em because we were stambled by a flag ! .We found that his PC had some sort of problem with Time Zones even though he tries to reset it, it seems the malware is somehow able to edit the TimeZone to what it wants, which is the malware author name. I knew this was the file I was looking for, because OpenSSL with des3 salt will generate an encrypted file that starts with Salted. I used stegsolve tool to complete this challenge. So I went into the webshell, and put the private key into key_file, and tried to ssh to the remote server using. From here it was quite frustrating because you need to guess the flag words however I cracked it. (Using strings command). After extracting the files, there is another oreo image (2 pieces of oreo). On extracting the zip file we get two panda images at first I tried a loot of tools but it much easier the flag was in the differnce of the strings of the two images so. The challenge says to use a key_file to ssh to the remote machine, so I assumed that I need to look for a file that contained the key. So by a little brainstorming analyse we have : he loves what he does (math) // how this man can live xD, he have some enemies in the company he works in. and or 0x20 to 0.and removed remaining others . As hash is 68 61 73 68 in hex, I inputted this hex value into the Wireshark search to look for all packets that contained this hash information. keep pushing the image to left (press right key), you should get the flag at offset 102. This file corresponded to name: Zoo (2017) 720p WEB-DL x264 ESubs - MkvHub.Com. 500. We are also given the file disk.flag.img.gz. Once unpublished, this post will become invisible to the public and only accessible to Lena. hint incase you werent able to note which is the malware name, it would be a name that is of the GOD. I downloaded the file, extracted it. One is a distorted image and the other is a normal weird image. Either way, Volatility has some commands centred in analysing Truecrypt processed: truecryptsummary can give us information about the TrueCrypt process. I executed this script again to confirm. As for today, we are going to walk through the Medium level forensics. I assumed that the PIN is checked from left to right, where Access denied. so basically were provided with some files that we got from the victim pc and we need to investigate a malware that is in the victim pc . Save. by scrolling down we read a ahaha thing in one of the files so we open it and start digging arround . I made the script so that the PIN could be inputted like the following. After renaming it .jpg I run some tools and steghide worked perfectly and I got a flag.zip file. CTFLearn write-up: Forensics (Easy) 3 minutes to read. Therefore, I assumed that the flag might be contained in a file named flag.txt. First and foremost, locate a MEGA URL inside the download image. so this time we try to search what the reports can give us ! I then executed this script. I decided to view the contents of the file using. I viewed the contents of the file, which contained a very long text. 5. Save it as Decryptor.java and run it with the following command. As it was encrypted using openssl aes256 -salt -in flag.txt -out flag.txt.enc -k unbreakablepassword1234567, I decrypted it using, $ openssl aes256 -d -salt -in flag.txt.enc -out flag.txt -k unbreakablepassword1234567. Manage secrets in live memory it is a difficult and challenging process. Rating: 4.5. To view some basic info about the type of memdump, we do a volatility -f memdump.raw imageinfo to view the profile. Is your desk photo giving away important data? $ strings -t d disk.flag.img | grep -iE "flag.uni.txt". So I extracted it using. so decided why dont we take a look back at those 2 reports ! Open the registry file and look one line up. As the OpenSSL with the salt option generates encrypted text that starts with Salted, I decided to string search that using, strings -t d disk.flag.img | grep -iE "Salted". I prefer to replicate and solve real scenarios in CTF challenges instead of the very strange ones. Reverse Engineering (Solved 2/12) 27-05-2019. We solved all the digital forensics . Last week a CTF event organized by the Spanish Guardia Civil was organized, the II NATIONAL CYBERLEAGUE GC. Cryptography (Solved 11/15) Katycat Challenge (Forensics) katycat trying to find the flag but she is lazy. And we obtain the password: 13576479. From this, I assumed that the flag is contained in flag.uni.txt in the my_folder directory, so I decided to search for that using. really helpfull tool (ftk imager too is a good choice). And this revealed that it was a shell archive text. by thinking about phishing is we found that the most phishing techinques is either sending a file or a malicious url . As for today, we will go through the easy Forensics and most of the tasks contain basic . This created a file called flag2, and revealed that it was a LZOP compressed data. We must subtract 4 bytes for the length field of the second IDAT, subtract 4 bytes for the CRC of the first IDAT, and subtract 4 bytes again for the chunktype of the first IDAT. CTFLearn write-up: Forensics (Medium) 5 minutes to read Hello there, another welcome to another CTFlearn write-up. Bachelor of Computer Science and MSc on Cyber Security. HTB x UNI CTF Quals Forensics Writeup. The following shows the example execution, where Incorrect Length is outputted when a PIN that's not 8-digits is entered, Checking PIN is outputted if a 8-digit PIN is entered, and Access denied. Some people thought that Truecrypt had hidden vulnerabilities but long history short, nothing was found. I hope you liked the CTF event. Zh3r0 CTF : Digital Forensics Writeups. byte 3: Y movement. Their team did not manage to solve this challenge so lets see what was about and how to solve it. They can still re-publish the post if they are not suspended. Which created a new folder called _flag.extracted, and inside was a file called 64. the password is iamsorrymama ( weird password XD ), let's extract the zip file and see what we get. S0rry: We get a zip file protected with a password, I used zip2john to convert it to hash then cracked it with john using rockyou.txt word-list. We have a lot of stuff inside the image file. Made with love and Ruby on Rails. Right now it is discontinued and has been replaced by Veracrypt. (Nothing Is As It Seems). Like last time, it gave unknown suffix, so I renamed it to flag2.lzop, and I extracted it using. The following shows the example execution, where the Time taken is outputted in seconds. For solving forensics CTF challenges, the three most useful abilities are probably: Knowing a scripting language (e.g., Python) Knowing how to manipulate binary data (byte-level manipulations) in that language Recognizing formats, protocols, structures, and encodings Once unpublished, all posts by lambdamamba will become hidden and only accessible to themselves. GreHack CTF 2022. game reverse network proxy. This created a file called flag2.out, and revealed that it was a LZMA compressed data. Web Exploitation (Solved 2/12), All my writeups can also be found on my GitHub's CTFwriteups repository. The suggested profiles are Windows XP related, we can use one of them WinXPSP2x86 or WinXPSP3x86. Built on Forem the open source software that powers DEV and other inclusive communities. As for today, we are going to walk through the Medium level forensics. I tried to find the partition information using. I downloaded the file, extracted it, and checked the partitions using. with some research I found that it a type of data encoding and can be solved by replacing some hex value with 1 From this, I assumed that the flag was first written into flag.txt, encrypted and put into flag.txt.enc using OpenSSL aes256 with the salt option and a password with unbreakablepassword1234567, and flag.txt was shredded. Although it hasnt been identified at a particular location, something is triggering it to restart as soon as he logs in! We were fortunately able to get his PCs image and some of the files in it. By visiting the MEGA URL, you will get a ZIP file. Greeting there, welcome to another CTFLearn write-up. I did the operations in Sleuthkit Apprentice to find the partition informations, and I decided to string search flag.txt using, $ strings -t d disk.flag.img | grep -iE "flag.txt". We have two files from the challenge. TrueCrypt was a program that allows us to created encrypted containers and partitions. I looked through the packets, and found the file that started with Salted in packet 57. It contained the encrypted file with the contents. We're a place where coders share, stay up-to-date and grow their careers. So Basically autopsy gives you a report section that presents for us the recent activity that have been made in the pc . This will mount the container on our system giving us access to two files. So I extracted it using. So in this first chall were asked to give the name of the author that the malware have changed in the TimeZone information. One of his HECKER friend suggested to download some virus to destroy the data the other people has. As you would expect, this backfired. The overall packet capture looks like the following. Cryptography (Solved 11/15) 3. Gg anyway guys ^_^ TOP15 will be qualified to the finals if their writeups were approved by the the organizers. Another image is extracted from the zip. There I saw Forensics-Workshop repo, it contains 10 challenges and I managed to solve all of them.. This created a file called flag4, and revealed that it was a ASCII text and contained the following. Therefore, 40000000 is what I will be using for the second test batch, thus I used the following shell script. This shows that 48000000 takes the longest, therefore I will be using this for the third test batch. I also decided to find the full contents of the file that contained Salted using, $ ifind -f ext4 -o 411648 -d 10238 disk.flag.img, $ icat -f ext4 -o 411648 disk.flag.img 1782. On downloading the resources we get a image and wav files So from description it is clear that we need to do so using aperies.fr I got the key and on decoding the wave file as it was a morse code : So it was clear nothing in audio so I use the extracted key 42845193 to extract data from steghide you can use any online tools also. This is because Im not really good at Java programming. There is one password-protected zip file. However, it had the permissions 0664 which was too open so the private key was unusable. I always love to play forensics and memory analysis challenges. In the last few rows, I saw { 3 n h 4 n and c 3 d _ 6 7 8 3 c c 4 6 }, which looked like the flag, so I concatenated this to form {3nh4nc3d_6783cc46}. I made the following Python script side.py to measure the time before Access denied. I logged into the master server using this PIN, which gave me the flag. The Forensics challenges I solved in picoCTF 2022 are the following. I opened the file , it was blank , but there were 88 lines which I double checked with Autopsy, and saw that the commands used were contained in .ash_history. You can find the flag at the right place when you look, it will be obvoius when u look at it! but after taking some time searching arround i found out that im in a rabbit hole ( that i made it by myself) . If you have played other CTF challenges this seems a little obvious but let it break into parts. We are also given the file disk.img.gz. $ strings -t d disk.flag.img | grep -iE "flag". Binary Exploitation (Solved 5/14) Hi all , I participated at zh3r0 ctf with my team and we finished up 7th in the ctf , there was really cool challenges . The Top 8 Cybersecurity Resources for Professionals In 2022 Nakul Singh Cyberyami CTF Graham Zemel in The Gray Area The Ultimate List of Bug Hunting Resources for Beginners HotPlugin in System Weakness Forensics Challenges HackTheBoo CTF 2022 Help Status Writers Blog Careers Privacy Terms About Text to speech We are also given the file capture.flag.pcap. The most popular tool for memory analysis is Volatility. {UPDATE} Mouse in City Hack Free Resources Generator, Why it is important to protect your privacy online. Open up the PCAP file with Wireshark and follow the TCP stream to frame 3. Opening this up on Wireshark showed the following. The third byte is "delta Y", with down (toward the user) being negative. The difference is FFB1. Let's do a quick start. I decided to use zsteg instead, with the -a option to try all known methods, and the -v option to run verbosely. KapKan (Forensics1 . while i was searching arround i reports and documents i was taking some notes about what could be malicious , and this where things get intersting by side ! Knowing that we can launch truecryptpassphrase for retrieving the password used to open the container. I was expecting to find the flag at this point but it is not much further away. While reading the writeups published by CTF team bi0s, I came across the github profile of Abhiram. Unflagging lambdamamba will restore default visibility to their posts. First of all, extract the file and read the log. Because of that, I used the latest stable release, Volatility 2.6. so here basically the author tells us that the pc have an another malware so we need to find it . I went to Steganography Online to decode the image, but decoding the image did not reveal anything. So I extracted it using. I will find the intended solution and update the post soon. while browsing the file i noticed a folder called typedurls , that was really worth checking because we see in autopsy there was a web history result section but not the full one , so after scaning this file we found a url that looks really suspecious http://w3.you-got-million-dollars-click-me.nr.hg.org.tech/ ( please dont enter it nthng there ) so we wrapp the url with the flag format and boom we get the flag, flag : zh3r0{http://w3.you-got-million-dollars-click-me.nr.hg.org.tech/}. so as the description says we need to find an another malware ( those guys have no mercy for this poor man ,damn) , remember saying that reports are now our primary tool why dont we check it again and see if we missed anything . THE hint in the challenge was asking us the re read the first chall description carefully and examining the events that occured that time . Chall description : We havent found the trace of how the virus could have got into the system. I always start with pstree. is outputted. I had the chance to participate with CyberErudites Team in the first edition of HackTheBox University CTF. Are you sure you want to hide this comment? Problem is, where is the password? Extract all the files within the image, we find what we needed. Once suspended, lambdamamba will not be able to comment or publish posts until their suspension is removed. We are also given the file Flag.pdf. and after analysing it all , by saying analysing i mean opening it and reading it carefully because it was pretty straight we find some really good things . and rest with 0 , which will give a binary and hence flag.I wrote a python file which will convert \t or 0x09 to 1 Love podcasts or audiobooks? After that, Ive drafted the following Java code. At the 2021 census its population . OtterCTF dates from December 2018 and includes reverse engineering, steganography, network traffic, and more traditional forensics challenges. This shows that 48390000 takes the longest, therefore I will be using this for the sixth test batch. Along with the challenge text and an audio file named forensic-challenge-2.wav. Replace the length field with 00 00 FF A5. However, there were too many entries with the string flag, so I decided to narrow the string search down. while searching arround we found an exe file that seems really obvious is a thing and boom thats a flag . I decided to look further into this, so I took the offset for nano flag.txt, which is 204193835, and subtracted 184549376 (which is 360448 * 512) using. And I did ssh again to the remote server, which contained a file called flag.txt which contained the flag. so when reranging this ideas we can have an idea that the attacker got sort kind of a malicious email that had the malware but the malware original place where ? By just opening the first report i think we can determine after some analysis we found the flag, Software\Microsoft\Windows\CurrentVersion\Explorer\Shell FoldersLastWrite Time Sun Jun 14 10:03:02 2020 (UTC). 2. We solved all the digital forensics challenges so were gonna make a little writeup trying to explain everything ! As most private keys contain the string OPENSSH PRIVATE KEY, I string searched that using, $ strings -t d disk.img | grep -iE "OPENSSH PRIVATE KEY". using the same in these challenge we are getting asked to search for some several vectors that the malware could get into from ! Using binwalk did not extract it, so I extracted this using. I tried to open this up in my PDF reader, but it said that it cannot be opened. Similar to the first task, binwalk the oreo.jpg. Reaching this point let me clarify that this is not a Truecrypt vulnerability. Here, I saw that the pin 40000000 took the longest, with a significant time difference from the other PINs. as for this kind of challenges i like to discover the os version and some information about it so i played arround the files and found this under the Operating System Information section : Windows Xp service pack 1. we have an idea about what system is using so we can google about some paths that may be usefull in our challenges. Before I executed this script, I closed all programs that I wasn't using to reduce variations in time due to background processes. so i cut down all the numbers from right to 8 bytes Templates let you quickly answer FAQs or store snippets for re-use. This outputted some interesting entries, and the following caught my eye. 3. Here is what you can do to flag lambdamamba: lambdamamba consistently posts content that violates DEV Community 's Download the PDF file. We are also given the file network-dump.flag.pcap. So I redirected the output to flag.txt.enc using, $ icat -f ext4 -o 411648 disk.flag.img 1782 > flag.txt.enc. The flag is located at the bottom-right corner. We are also given the file torrent.pcap. :). Xor the extracted image with the distorted image with stegsolve. One of these uploads is a key and the other is a function block. It is the biggest economic center in Northwestern Bulgaria. Posted on Apr 3 The first thing to do is download the memory image ( OtterCTF.vmem ). Since it was password protected I use fcrack and everyones fav rockyou.txt to crack it . Executing this showed that 48390513 is the correct PIN. The password is encoded with base64 and make sure to change the URL encoded padding (%3D) to =. I downloaded the file, extracted it, and used the following command. Secrets in live memory have been always a problem. and noticing the exe file make it clear , even for more you can google the name of exe , its not a known process or a miscrosoft one , so that makes it clearly a thing , we wrapp it into flag format and rock ! byte 2: X movement. The above image was given following the basic commands I got this by binwalk, As results show it has some RAR content on unraring the content I got the flag, As starting with the classical command to check the file formate and it was a .jpg file. In which, 3 were forensics category and 1 was the web category. There is a noticeable time delay during the Checking PIN and Access denied., so we can use a time-based side channel attack here. This returned 2363, so I printed the contents of that file using, $ icat -f ext4 -o 360448 disk.flag.img 2363. So I looked up 17d62de1495d4404f6fb385bdfd7ead5c897ea22 on Google, and saw that it corresponded to Awakened.2013.1080p.BluRay.X264-iNVANDRAREN. Reverse Engineering (Solved 2/12) 5. For example, in Spain, we have a real case where the suspect used Truecrypt and it is not possible to open these containers. Chall name : SoundlessChall description : Good job in finding the flag! For further actions, you may consider blocking this person and/or reporting abuse, Go to your customization settings to nudge your home feed to show content more relevant to your developer experience level. It seemed like these two people had been exchanging files, and one person forgot how to decrypt it, so the other person tells them to decrypt it using, openssl des3 -d -salt -in file.des3 -out file.txt -k supersecretpassword123. Therefore, the PIN with the correct leftmost digit should take the longest time because it will move onto the next digit comparison. DEV Community 2016 - 2022. CTF challenges are usually focused on Web and Reversing, but what about forensics? 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