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Kn1ghtF4ll

Challenge Description

Monitor Bob is making a plan to take down Jason Todd, The RedHood, but unfortunately his cryptowallet is lost when the batfamily got hands on it. Is it bob that sent a weapon to take that down? Can the Dark Knight save Jason Todd from the monitor? well we got this!

Flag format: icc{md5sum(crypto-wallet-password)_md5sum(seed.seco)_md5sum(storage.seco)}

MD5 Hash: f0066c7d3e2af51a32e4ad7c94fa8589 Kn1ghtF4ll.ad1

Short Writeup

  • get the exodus wallet password from the pagefile.sys by pattern matching
  • dump the ransomware from the memdump
  • reverse the ransomware and understand what it does
  • get the key from registry and iv from environment variable for AES decryption
  • get the encrypted files from ransomware heap
  • decrypt the encrypted files using AES-CBC by using the key and iv obtained

Handout

Kn1ghtF4ll.zip

Password

URpJTxNg3PDjbv8zI2jC

Flag

icc{8881b7c230ca7835c03e52ee157031f0_4c5b2adbd36341474aa8a37528bd0aad_f665c8b1287408dd78256fef59e83d1d}

Author

Azr43lKn1ght sp3p3x jl_24 gh0stkn1ght