**This is a possible solution, provided by Syskron Security.**
## Try to access the linkGoing to https://[…]/bbd1595da2871a8f0c87c9042c4918f7661b8615/ shows that you need a username and a password. The login is restricted to the IT department of BB Industry a.s. (written in Czech).
## Find someone who works in the IT departmentOn https://[…]/career/, there are two employees (Karel and Lenka). Karel is the head of IT at BB Industry, so he likely has access to the folder. This means we need the username and password of Karel.
## Find the username of KarelFrom the career page, you can navigate to https://[…]/job-2195/. On this page, you see the e-mail address len.vapenikova[at]bb-industry.cz. Obviously, usernames are the first the characters of the given name and the surname. This means that Karel's username could start with kar; however, we don't have the surname so far.
## Find Karel's surnameExamining the picture of Karel reveals his surname (Tauchmann). So the username is kar.tauchmann.
## Find Karel's passwordTo get the password, we have to look at the leaked employee database (part of the "Leak audit" challenge of the CTF). Get the old password of Karel (`SELECT password FROM personal WHERE givenname = "Karel" AND surname = "Tauchmann";` = `ultra$ecureHESLO2o17`). This won't work because he updated his password in the meantime to `ultra$ecureHESLO2o2o`. Use the username and password to bypass the authentication.
## Decrypt the 7zip fileIn the folder, there are two files (encrypted 7z files and a txt file). You have to decrypt the 7z file. In the txt file, you can read that these files belong to Lenka, Head of HR. Get Lenka's password from the database dump (`SELECT password FROM personal WHERE givenname = "Lenka" AND surname = "Vápeníková";` = `MilujuJablka`). Use the password to decrypt the 7z file.
## Find the flagIn the 7z file, there are 1000 files. Use scripting to quickly iterate through the files to get the flag (e.g., `grep -R "syskronCTF" *`).
Flag: `syskronCTF{th4NK5-F0r-ur-W0Rk}`