Bitcoin2john Instant

Bitcoin2john — Full Story

Option A: John the Ripper (official)

1. Download John the Ripper (community-enhanced version, "jumbo").
   • GitHub: openwall/john (jumbo branch)
2. Locate the run/ directory.
3. Find bitcoin2john.py (or similar name like bitcoin2john without extension on Linux).

2.3 Algorithm Support

The tool supports various encryption methods used historically by Bitcoin Core, including:

• SHA-512 (Standard Bitcoin Core derivation).
• SHA-256 (Older wallet formats).
• Support for BIP-38 encrypted private keys.

1. Executive Summary

Bitcoin2John is a utility tool used to extract hash data from a Bitcoin wallet file (specifically wallet.dat). Its primary purpose is to prepare a Bitcoin Core wallet for password cracking. By isolating the cryptographic hash and salt from the wallet file, it allows security researchers and penetration testers to use tools like John the Ripper or Hashcat to recover lost passwords or audit wallet security. Bitcoin2john

2.2 Input and Output

• Input: A standard Bitcoin Core wallet.dat file.
• Output: A formatted hash string (typically in the format used by John the Ripper).

Example Output Format:

$bitcoin$64$[hex_encoded_salt]...$[iterations]...

4. Supported Wallet Types

Bitcoin2john supports several wallet formats: Bitcoin2john — Full Story Option A: John the

| Wallet | File/Format | Notes | |--------|-------------|-------| | Bitcoin Core (original) | wallet.dat | Berkleley DB, old and new formats | | MultiBit Classic | .wallet file | Uses scrypt + AES | | MultiBit HD | .wallet file | Different structure | | Armory | .wallet file | Legacy support | | Electrum (old versions) | default_wallet | Pre-2.0 format | | Hive | JSON-based | Limited | GitHub: openwall/john (jumbo branch)

Important: Modern BIP39 seed phrase wallets (most 12/24-word wallets) are not directly crackable via Bitcoin2john unless they also have an encrypted wallet file. For BIP39, you need tools like btcrecover or findmycoins.

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4.2 Malicious Use Cases

• Theft: Malicious actors who steal wallet.dat files from compromised computers use Bitcoin2John to prepare the file for cracking. If the user’s password is weak, the attacker can steal the funds.
• Ransomware: Some ransomware variants specifically target wallet files for extraction rather than encrypting the whole drive.

Step 3: Crack with John the Ripper

john --format=bitcoin wallet_hash.txt --wordlist=rockyou.txt

Or for faster cracking using Hashcat (convert format first):

• Bitcoin2john output is already Hashcat mode 11300 (Bitcoin wallet.dat).
• Save just the $bitcoin$... line into a file.
• Run:

hashcat -m 11300 -a 0 bitcoin_hash.txt rockyou.txt

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