forensics ctf writeups

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Date: 12/12/2022

We can see that the Truecrypt container was opened and mounted the 20201011. Yaknet 3. As for today, we are going to walk through the Medium level forensics. 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 this time we try to search what the reports can give us ! There I saw Forensics-Workshop repo, it contains 10 challenges and I managed to solve all of them.. byte 2: X movement. 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. Hello there, another welcome to another CTFlearn write-up. CTF Writeup: picoCTF 2022 Forensics My picoCTF 2022 writeups are broken up into the following sections, 1. $ strings -t d disk.flag.img | grep -iE "flag". We have two files from the challenge. 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. so i looked closely and saw that so many numbers werent of 8 bytes . The flag will be in format flag{}. So, I'm going to do more bundle walkthrough on the CTFLearn. The first thing we need to do is to identify the operative system in order to properly analyzed the live memory adquistion. This shows that 48000000 takes the longest, therefore I will be using this for the third test batch. Hi all , I participated at zh3r0 ctf with my team and we finished up 7th in the ctf , there was really cool challenges . So, all credits go to this youtube video. We have a lot of stuff inside the image file. One of his HECKER friend suggested to download some virus to destroy the data the other people has. I looked through the packets, and found the file that started with Salted in packet 57. However, it had the permissions 0664 which was too open so the private key was unusable. Much appreciated. HSCTF 6 CTF Writeups. 5. But I have I friend who participate, He knows I love forensic challenges so He sent me one of the challenges that were part of the competition. hint incase you werent able to note which is the malware name, it would be a name that is of the GOD. Updated on Oct 16, My picoCTF 2022 writeups are broken up into the following sections, CTFLearn write-up: Forensics (Medium) 5 minutes to read Hello there, another welcome to another CTFlearn write-up. It contained the encrypted file with the contents. This CTF ran from July 7, 2017 to July 8, 2017. This showed that the Linux partition was using a Ext4 partition with a block size of 1024 bytes. With you every step of your journey. Challenge 1 For the first test batch, I decided to use 00000000, 10000000, 20000000, 30000000, 40000000, 50000000, 60000000, 70000000, 80000000, 90000000 for the PINs. while searching arround we found an exe file that seems really obvious is a thing and boom thats a flag . really helpfull tool (ftk imager too is a good choice). 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! Then I used the binwalk to extract the ar archive. I opened up Autopsy and searched for the directory that contained flag.txt and flag.uni.txt in the fourth partition of the disk, which is Linux (0x83) 360448-614399. I decided to use zsteg instead, with the -a option to try all known methods, and the -v option to run verbosely. Thanks for keeping DEV Community safe. By visiting the MEGA URL, you will get a ZIP file. The password is encoded with base64 and make sure to change the URL encoded padding (%3D) to =. Your goal is to decode the serial traffic, extract the key and function block, and use these to find the flag. Cryptography (Solved 11/15) 3. The flag is located at the bottom-right corner. Greeting there, welcome to another CTFLearn write-up. 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. This week we decided to go for HSCTF 6 organized by WW-P HSN CS Club . So I went into the webshell, and put the private key into key_file, and tried to ssh to the remote server using. For this task, you have to look really deep. Once unpublished, all posts by lambdamamba will become hidden and only accessible to themselves. As you would expect, this backfired. First of all, extract the file and read the log. This is because Im not really good at Java programming. so i saw xxd of the file . so the first idea i got is to start looking in emails and reports that autopsy grabbed for us ( man i love that tool ) . After decryption succeeded, I was left with file.txt that contained the flag. Extract all the files within the image, we find what we needed. enjoy ! is outputted. I knew this was the file I was looking for, because OpenSSL with des3 salt will generate an encrypted file that starts with Salted. 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. Opening this up on Wireshark showed the following, I decided to Follow TCP stream, which revealed the flag. Yaknet 2. by scrolling down we read a ahaha thing in one of the files so we open it and start digging arround . were getting selected. I will find the intended solution and update the post soon. Replace the length field with 00 00 FF A5. GreHack CTF 2022. programming proxy network. TrueCrypt was a program that allows us to created encrypted containers and partitions. 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. Open the registry file and look one line up. DEV Community 2016 - 2022. We have found traces of yet another malware! The flag is hidden on the second commit. is outputted as soon as the leftmost digit does not match. THE hint in the challenge was asking us the re read the first chall description carefully and examining the events that occured that time . The password is located at the first downloaded picture where you find the mega URL. They can still re-publish the post if they are not suspended. 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. HTB x UNI CTF Quals Forensics Writeup. Built on Forem the open source software that powers DEV and other inclusive communities. How could this happen? So I extracted it using. How could a malware edit the TimeZone information if it had Administrator Privilege to the system!? Volatility is an Open Source project with a great and active community behind it, there are alternatives like Rekall but I personally prefer Volatility. There is one password-protected zip file. using the same in these challenge we are getting asked to search for some several vectors that the malware could get into from ! This showed the full command. So I extracted it using. . We are also given the file anthem.flag.txt. A collection of write-ups from the best hackers in the world on topics ranging from bug bounties and CTFs to vulnhub machines, hardware challenges and real life encounters. 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 ? the password is iamsorrymama ( weird password XD ), let's extract the zip file and see what we get. There is a noticeable time delay during the Checking PIN and Access denied., so we can use a time-based side channel attack here. Therefore, 40000000 is what I will be using for the second test batch, thus I used the following shell script. It is the biggest economic center in Northwestern Bulgaria. So I copied this file into a file with a .sh extension. This created a file called flag4, and revealed that it was a ASCII text and contained the following. 1) 07601 Link: https://ctflearn.com/challenge/97 This one is simple. The challenge asks for the Linux partition size, which is 0000202752. The container seems to be an encrypted container and snap.vmem it is a RAM acquisition. 27-05-2019. 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. I did Follow TCP stream, which revealed a conversation between two people. Binary Exploitation (Solved 5/14) We are also given the file disk.img.gz. We have a certain idea that somehow the virus might be redirecting the clicks to a different location where the virus resides or the location of music folder could be compltely different! Solution. I executed this script again to confirm. So we have just to spot where can the timezonesinfo would be . I downloaded the file, extracted it. 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 . To view some basic info about the type of memdump, we do a volatility -f memdump.raw imageinfo to view the profile. I always love to play forensics and memory analysis challenges. This revealed the flag at b1,rgb,lsb,xy, where rgb means it uses RGB channel, lsb means least significant bit comes first, and xy means the pixel iteration order is from left to right. This shows that 48390510 takes the longest, therefore I will be using this for the eighth test batch. I assumed that the PIN is checked from left to right, where Access denied. will you help her to find the flag? ICS A Different Type of Serial Key Attached are serial captures of two different uploads to an embedded device. 2. We are also given the file network-dump.flag.pcap. We are also given the file disk.flag.img.gz. . As this is a torrent challenge, I went to Wireshark and enabled the BitTorrent DHT Protocol (BT-DHT) by going to Analyze -> Enabled Protocol. Forensics Challenges. I tried to find the partition information using. This shows that 48390000 takes the longest, therefore I will be using this for the sixth test batch. again converting the output from binary to ascii doesnt give the flag. Chall name : SoundlessChall description : Good job in finding the flag! This shows that 48300000 takes the longest, therefore I will be using this for the fourth test batch. I looked through a few more, and I was at packet 51080 which had a hash value of e2467cbf021192c241367b892230dc1e05c0580e. From the program behaviour, I saw that the length is first checked, and if the length is 8, the program proceeds to check the digits of the 8-digit PIN code (otherwise, it immediately returns Incorrect length). After unlocking we got a image which have the flag . However, nothing useful came up. If you find the reason or the method for the above mentioned phenomenon you will find the flag there as an obvious one. I applied the bt-dht filter, and looked through the packets, and saw that some contained info_hash. 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. In this question we were given a password protected zip file so by using fcrackzip lets crack it . Although it hasnt been identified at a particular location, something is triggering it to restart as soon as he logs in! He has called the Worlds best forensics experts to come to his rescue! Open up the PCAP file with Wireshark and follow the TCP stream to frame 3. First of all, lets check the hidden files using the binwalk. (Using strings command). Located in the northern part of the country, it is the administrative centre of Pleven Province, as well as of the subordinate Pleven municipality. and divided 19644459 by the block size 1024 bytes using. Info: NTUSER.DAT files is created for every system user which contains some personnel files and data . :). I saw that a directory called my_folder was created, moved into the my_folder directory, flag was written into flag.txt, flag.txt was copied into flag.uni.txt, and the original flag.txt was deleted securely using shred, which would make it extremely difficult to recover. There are several attack vectors that a malware could get into the system which you will need to find. Chall description : Now, that you have found out how the malware got in, the next question is to find what the malwares name is, we have got a lead though, we found out that the virus wasnt removable from the system even after a system. And this revealed that it was a shell archive text. (Nothing Is As It Seems). By using the binwalk on the normal image, you will come across the following. the last 4 hours, we didn't well managed our time ! The overall packet capture looks like the following. Then I used that result, 19184 to find the inode number of the file containing the string file.txt using, $ ifind -f ext4 -o 360448 -d 19184 disk.flag.img. 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. Reverse Engineering (Solved 2/12) After that, find the passHash in the dump. CTF challenges are usually focused on Web and Reversing, but what about forensics? We are also given the file Financial_Report_for_ABC_Labs.pdf. Currently working as a cybersecurity researcher at the University of Alcal. so i cut down all the numbers from right to 8 bytes This will mount the container on our system giving us access to two files. 1. Now he cant even open his default music folder to hear some good musics! Another image is extracted from the zip. This will let us know whats processes were running in the system. Problem is, where is the password? Katycat Challenge (Forensics) katycat trying to find the flag but she is lazy. Before I executed this script, I closed all programs that I wasn't using to reduce variations in time due to background processes. The following shows the example execution, where the Time taken is outputted in seconds. Which created a new folder called _flag.extracted, and inside was a file called 64. Once unsuspended, lambdamamba will be able to comment and publish posts again. I Googled this, and saw that it corresponded to ubuntu-19.10-desktop-amd64.iso from LinuxTracker.org. Voices in the head is a 2000 point forensic challenge. I opened the file , it was blank , but there were 88 lines which Save it as Decryptor.java and run it with the following command. This returned 2363, so I printed the contents of that file using, $ icat -f ext4 -o 360448 disk.flag.img 2363. To automate this process, I made the following shell script auto.sh. Forensics (Solved 13/13) 2. Rating: 4.5. Either way, Volatility has some commands centred in analysing Truecrypt processed: truecryptsummary can give us information about the TrueCrypt process. Like last time, it gave unknown suffix, so I renamed it to flag2.lzop, and I extracted it using. So I looked up 17d62de1495d4404f6fb385bdfd7ead5c897ea22 on Google, and saw that it corresponded to Awakened.2013.1080p.BluRay.X264-iNVANDRAREN. The first thing to do is download the memory image ( OtterCTF.vmem ). This created a file called flag3.out, and revealed that it was a XZ compressed data. I logged into the master server using this PIN, which gave me the flag. However, this returned Filename has an unknown suffix, skipping, so I renamed it to flag2.lzma and I extracted it using. Right now Volatility has a 3.0 version with a lot of improvements but it is under beta. Therefore, I changed the permissions to 400 using. name of the God huh , thats big bro x) . Lets do a quick start. which gave me this . There is the flag shown in the screenshot below. As the title suggested, the distorted image is somehow XOR between 2 pictures. In which, 3 were forensics category and 1 was the web category. GreHack CTF 2022. programming proxy network. 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 . The Forensics challenges I solved in picoCTF 2022 are the following. 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. The flag is hidden inside the I warned you.jpg file. I downloaded the file, extracted it. This file corresponded to name: Zoo (2017) 720p WEB-DL x264 ESubs - MkvHub.Com. After extracting the files, there is another oreo image (2 pieces of oreo). Our first task is to find one of the picture and XOR it to find another image. Based on the GameBoard, almost all the challenges were solved by at . The second file is a list of users and password in XML format. As for today, we will go through the easy Forensics and most of the tasks contain basic . Using binwalk did not extract it, so I extracted this using. Using this information we could be able to start a brute force attack of the container. So I looked into flag.uni.txt, which contained the flag. Just select the container, specify the password, and remember to check TrueCrypt Mode, because it is a Truecrypt container. The information we have is that MR.Zh3r0s music folder isnt really a music folder,(i.e), hes music folder seems to trigger the virus software somehow whenever he clicks it! First and foremost, locate a MEGA URL inside the download image. Moreover, this replicates a real scenario. Are you sure you want to hide this comment? $ strings -t d disk.flag.img | grep -iE "pico". 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. 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}. Register for the much-awaited virtual cybersecurity conference #IWCON2022: https://iwcon.live/. We can discover processes running, dump files, secrets, connections and a lot of useful information. First off, open up the dumpster with the visualvm. And we need answers to some questions that follow, this would be your first assignment! I was expecting to find the flag at this point but it is not much further away. Is your desk photo giving away important data? Similar to the first task, binwalk the oreo.jpg. here , in this challenge the power of notes comes , remember when i said always take notes , well this chall didnt took more than 30 seconds . with some research I found that it a type of data encoding and can be solved by replacing some hex value with 1 So, I made the 4 challenges in zh3r0 CTF. This write-up only covers the memory forensics portion, but the whole CTF is available to play as of the publication of this post. I viewed the contents of the file, which contained a very long text. I went ahead to CyberChef and converted this from hex, picoCTF{f1len@m3_m@n1pul@t10n_f0r_0b2cur17y_347eae65}. Cryptography (Solved 11/15) We got another image inside 3.png. Therefore, the PIN with the correct leftmost digit should take the longest time because it will move onto the next digit comparison. I checked the file type of flag, and revealed that it was a lzip compressed data. For example, in Spain, we have a real case where the suspect used Truecrypt and it is not possible to open these containers. GreHack CTF 2022. game reverse network proxy. code of conduct because it is harassing, offensive or spammy. So in this first chall were asked to give the name of the author that the malware have changed in the TimeZone information. 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. I used stegsolve tool to complete this challenge. So I went to /root/my_folder directory, and I saw that flag.txt did not contain any relevant information because it was shredded. This shows that 48390500 takes the longest, therefore I will be using this for the seventh test batch. This created a file called flag.out, and revealed that it was a LZ4 compressed data. Once suspended, lambdamamba will not be able to comment or publish posts until their suspension is removed. Posted on Apr 3 Right now it is discontinued and has been replaced by Veracrypt. Reaching this point let me clarify that this is not a Truecrypt vulnerability. 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. 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 then executed this script. I downloaded the file, extracted it, and used the following command. No binwalk or steghide for this task, just a normal stereogram. Last week a CTF event organized by the Spanish Guardia Civil was organized, the II NATIONAL CYBERLEAGUE GC. Some people thought that Truecrypt had hidden vulnerabilities but long history short, nothing was found. Forensics (Solved 13/13) The difference is FFB1. 3. Once unpublished, this post will become invisible to the public and only accessible to Lena. Templates let you quickly answer FAQs or store snippets for re-use. 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. Follow my twitter for latest update, If you like this post, consider a small donation. So I exported the packet as saltedfile.bin using File > Export Packet Bytes. We hosted our first CTF successfully. I renamed it to flag4.xz and I extracted it using. KapKan (Forensics1 . [Link: https://ctflearn.com/challenge/104]. It will become hidden in your post, but will still be visible via the comment's permalink. 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. This shows that 48390000 takes the longest, therefore I will be using this for the fifth test batch. Love podcasts or audiobooks? I went to Steganography Online to decode the image, but decoding the image did not reveal anything. 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. Along with the challenge text and an audio file named forensic-challenge-2.wav. The first thing we did was to open up the WAV file and check out the content. I assumed that this was the flag, and I just needed to add the picoCTF wrapper. Made with love and Ruby on Rails. note : please read every line because its necessary to understand whats going on and how i thought threw the challs ! In summary, we have a password, a master key, the encryption algorithm and a container. This will also give us information about the Encryption Algorithm, AES and the algorithm mode used, XTS. Zh3r0 CTF : Digital Forensics Writeups. We solved all the digital forensics . 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). The cheapest way to get from Pleven to Constana costs only $20, and the quickest way takes just 5 hours. So I redirected the output to flag.txt.enc using, $ icat -f ext4 -o 411648 disk.flag.img 1782 > flag.txt.enc. Therefore, I assumed that the flag might be contained in a file named flag.txt. The most interesting process to lookup is TrueCrypt. Gg anyway guys ^_^ TOP15 will be qualified to the finals if their writeups were approved by the the organizers. Chall description : We havent found the trace of how the virus could have got into the system. so here basically the author tells us that the pc have an another malware so we need to find it . Executing this showed that 48390513 is the correct PIN. 9 min read. always when doing things like that notes can help sometimes , maybe not now but later on . The third byte is "delta Y", with down (toward the user) being negative. This created a file called flag3, and revealed that it was a LZIP compressed data. $ volatility -f memdump.raw imageinfo Volatility Foundation Volatility Framework 2.6 INFO : volatility.debug : Determining profile based on KDBG search . After renaming it .jpg I run some tools and steghide worked perfectly and I got a flag.zip file. This created a file called flag2.out, and revealed that it was a LZMA compressed data. As for this kind of challenges i use autopsy ! and or 0x20 to 0.and removed remaining others . 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! Given this memory dump, we will use Volatility to proceed. after some searching i found out that internet explorer saves some good info in this file so why dont i take look . Their team did not manage to solve this challenge so lets see what was about and how to solve it. One is a distorted image and the other is a normal weird image. 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 ! 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 CTF ran for eactly 24 hrs and we had easy, medium and hard challenges. Without thinking twice, extract all the files with the following command. And I did ssh again to the remote server, which contained a file called flag.txt which contained the flag. Author: CISA 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. but after taking some time searching arround i found out that im in a rabbit hole ( that i made it by myself) . we officially hunted down all those three malwares ! 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. byte 3: Y movement. I inputted this Linux partition size to the remote access checker program, which gave me the flag. CTFLearn write-up: Forensics (Easy) 3 minutes to read. And We have a suspicion if he only downloaded one malware or more than one? Running image info will give us the suggested operative systems profiles. The most popular tool for memory analysis is Volatility. Pleven ( Bulgarian: pronounced [plvn]) is the seventh most populous city in Bulgaria. Secrets in live memory have been always a problem. I checked the file type of 64, and revealed that it was a gzip compressed data. We are also given the file torrent.pcap. http://w3.you-got-million-dollars-click-me.nr.hg.org.tech/. And thats all, hope you like the Write-Up ;). As for today, we are going to walk through the Medium level forensics. If we open Readme.txt we can see that they are looking for the password associated with the IP: 48.37.29.153. There were files that contained OPENSSH PRIVATE KEY, so now I have to find the actual contents of the private key file. Now I know what file I am supposed to look for and what directory and partition it was in. 4. keep pushing the image to left (press right key), you should get the flag at offset 102. So lets open the container, using Veracrypt we can open it. This one is simple. by thinking about phishing is we found that the most phishing techinques is either sending a file or a malicious url . I always start with pstree. At the 2021 census its population . This created a file called flag2, and revealed that it was a LZOP compressed data. After realizing that i should redirect my thinking in the browser i checked what autopsy gave as information and found a NTUSER.DAT file . Which showed the partitions and their size. Opening this up on Wireshark showed the following. The first packet that contained info_hash was packet 79 with a hash value of 17d62de1495d4404f6fb385bdfd7ead5c897ea22. 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/}. 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. A hint was distributed to all teams as a starting point. I decrypted it using what was mentioned in the conversation, openssl des3 -d -salt -in saltedfile.bin -out file.txt -k supersecretpassword123. $ strings -t d disk.flag.img | grep -iE "flag.txt". .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. Hello Everyone, I am a member of zh3r0 CTF team.

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