That hex string 5f4dcc3b5aa765d61d8327deb882cf99 looks like an MD5 hash. Decode it as ASCII? No – it’s 32 hex characters → 16 bytes when decoded → likely the AES‑128 key. Further reversing shows the config file is encrypted with AES‑128‑CBC , IV is the first 16 bytes of the file.

Format:

So the hardcoded key = . 5. Decrypting the Config The file frosty_config.bin is provided.