Write-up of Long Range 2 challenge, RealWorldCTF 2024. Official challenge prompt:
Of late, whispers doth persist behind mine back. Yesterday, under the studio tower, a peculiar contraption was found by me. I am most intrigued to discover the content of their discourse.
The challenge attachment contains two files:
flash_dump (8.0MiB, sha256: 508d328f855d5398aab38cc93bc66bec91dffd2bfff3691c55b096a6d273d972) 486_375MHz-1MSps-1MHz.wav (293MiB, sha256: 1c60c7a45a4d1c279ca334339eecb51043b91b6714dda8382ecdcd3e7d4370f3) flash_dump forensics analysis $ file ./flash_dump ./flash_dump: DOS executable (COM), start instruction 0xe903023f bc983c40 $ binwalk ./flash_dump DECIMAL HEXADECIMAL DESCRIPTION -------------------------------------------------------------------------------- 88595 0x15A13 Neighborly text, "neighbors a simple (0 id) broadcast" 109607 0x1AC27 HTML document header [....