Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
Compare `process_list.txt` with `image_regions.txt` to detect process hollowing. The target process has a PRIVATE, RWX image-base region and a mismatch between its on-disk and resident hashes.
Check each process's image-base region in image_regions.txt; normal ones are file-backed MAPPED and execute-only
The hollowed process's image base is PRIVATE with PAGE_EXECUTE_READWRITE (RWX)
That single row holds the flag; corroborate via the PEB on-disk hash vs resident hash mismatch