DEF CON 33 - Evolution of Drain Attacks - Utvecklas & George

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✅ Optimized Summary: The Evolution of Drain Attacks in Crypto (2021–2025)

Drain attacks exploit smart contract functionality to deceive victims into authorizing transactions that transfer crypto assets to attackers. Initially targeting Ethereum, these attacks have evolved across multiple blockchains, deployment vectors, and monetization models, posing persistent threats to users.

🔍 Attack Evolution & Technical Mechanisms

• Ethereum Foundations (2021):

  • setApprovalForAll Exploit: Scammers abused this standard exchange function via phishing sites, tricking users into granting unlimited token access. Attackers could instantly drain approved assets (e.g., ERC-20 tokens, NFTs).
  • EIP-2612 permit Function: Enabled gasless approvals via signatures. Malicious permits never expired, allowing attackers to execute transactions later without user consent—masking theft as a low-risk signature.
  • Inferno Drainer (2022): A pivotal tool enabling single-transaction draining of ALL tokens/NFTs. In one case, $500k+ was lost in one click, demonstrating escalated scalability.
  • EIP-7702 & Pectra Upgrade (2025): Introduced off-chain setCode messages, enabling full wallet takeovers. Once signed, attackers gain total control over assets.

• Blockchain Expansion:

  • Solana: Unique vulnerability enabling drainage of native SOL tokens (unlike Ethereum) + SPL tokens (Solana’s ERC-20 equivalent).
  • TON (Telegram): Targeted via fake mini-apps/safeguard bots, draining native TON and jettons (TON’s ERC-20 analog).

🌐 Deployment & Propagation Vectors

Attacks spread through:

1. Account Takeovers: Discord (e.g., BAYC compromise, 2021), Twitter, Instagram.

2. Phishing Infrastructure: