Fetch the Flag CTF 2022 writeup: Pay Attention

The Snyk 2022 Fetch the Flag CTF challenge "Pay Attention" involves simulating a case where a popular package has been hijacked and turned malicious, requiring the team to take on the role of a security researcher investigating the issue. The challenge begins with a downloadable file pytest-7.1.3.tar.gz, which seems to be an archive of the latest pytest release but actually contains a suspicious line of code that imports libraries and invokes function calls like b64decode and exec. By observing the code and using Python's built-in functions, such as __import__() and print(), the team is able to decode the base-64 string and eventually find the flag hidden among the declarations of an obfuscated script downloaded from a remote resource. The challenge demonstrates common techniques used in malicious script injections and requires the team to use reverse engineering skills to uncover the hidden flag.

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