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You're a senior cybersecurity analyst working for a private company that handles sensitive data for various government agencies. One day, your team is unexpectedly visited by auditors from an external government agency. They conduct a thorough check of your systems, including system diagnostics and some routine audits, then leave without providing much insight into what exactly they were looking for.

Later that evening, after the auditors have left, you’re reviewing the security logs and noticed something unusual. On the main servers, a suspicious binary named "valka" has appeared out of nowhere. The binary is located in a hidden directory and doesn't show up in any normal scans. The file’s presence is unsettling, especially considering it wasn’t there before the auditors' visit. Something is off.

The external auditors may have been more than they seemed, and you suspect they may have planted the file during their visit. Now, it’s up to you to investigate and reverse-engineer the valka binary to understand its true purpose. Was it a covert tool left behind? If so, for whom? And what is its objective?