Here are the flags and the walkthrough Shop-Knock Knock Knock Okay then, this should be something easy… lets look for a bunch of logins from the same ip. You could use something like this or even look into the file… cat DownUnderShop.JSON# | jq '. | .origin, .url' | grep -B1 login Then you will see, that the IP of
photo-op-spot Points: 150 In three words tell me where I stood when I grabbed this picture. Solving Okay we got a picture from a strange tower… lets google for that picture. We’ll find quickly what we are looking for.. the tower is located in Seattle. Public Art "Transforest" Tourist attraction in Seattle, Washington Now we have to find the three
root-me Points: 400 SSH into the challenge host, 0.cloud.chals.io on port 19777 Username: ubuntu Password: jctf2022! Find the flag Solving We have login credentials for a server… so let’s dive in: ssh ubuntu@0.cloud.chals.io -p 19777 Okay… first we check sudo permissions, therefore just use sudo -l, but we don’t have any permissions. So let’s look for some other quickwins, shall
stolen-data Points: 150 Someone accessed the server and stole the flag. Use the network packet capture to find it. Solving Okay – let’s load the pcap file into wireshark and have a further look. First I tried to download all interessting files… html and so on, but this was a dead end. After that I looked in the statistics and
speedy-at-midi Points: 150 Your partner-in-crime gets a hold of a MIDI file, riff.mid, which intelligence officials claim to contain confidential information. He has tried opening it in VLC Media Player, but it sounds just like the piano riff in riff.mp3. Can you find the right tool to extract the hidden data? Solving Downloaded the files Looked at it wit sonic
scavenger-hunt Points: 350 My friend told me he hid a flag for me on this server! Server: 0.cloud.chals.io SSH port: 24052 Username: jersey Password: securepassword ssh jersey@0.cloud.chals.io -P 24052 Solving Grepping through the remote filesystem did the trick 🙂 grep -ir "jctf{" /
recent-memory Points: 250 Use the memory image in the Google drive link below. An attacker left behind some evidence in the network connections. Follow the attacker’s tracks to find the flag. https://drive.google.com/drive/folders/1ubSx3pwHOSZ9oCShHBPToVdHjTev7hXL Solving Okay let’s analyze the memory file, I will use volitality3 for this. With this command we can get all net sessions stored in the memory. python vol.py
data-backup Points: 250 The backup of our data was somehow corrupted. Recover the data and be rewarded with a flag. Solving My first attempt is to restore the file from the backup with foremost or binwalk -e. So I tried it with binwalk and got some files. Also a PDF file, that contains the flag. jctf{fun_w17h_m461c_by735}
corrupted-file Points: 400 Can you find a way to fix our corrupted .jpg file? Solving First we check the corrupted file with file: $~: file flag_mod.jpg flag_mod.jpg: data Okay, then let’s look with hexedit or something similar, to look for further hints. Okay – I see the JFIF tag in there, but why could we open the image? I checked
Operation Orchid Description Download this disk image and find the flag. Note: if you are using the webshell, download and extract the disk image into /tmp not your home directory. Download compressed disk image Solving Check the file type of the file via file image It’s an image of a harddrive disk, to mount it, we need to calculate the