Crypto Forensics Report: $1.9M Smart Contract Exploit (Aztec Bridge Campaign)

Incident Date: June 17, 2026
Analyst: [Aimen Rizouk / AML-Solana]
Asset Impacted: Ethereum (ETH)
Total Value Locked (TVL) Lost: 1,158 ETH (~$1,911,614.82 USD)

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1. Executive Summary

On June 17, 2026, an attacker executed a highly targeted smart contract exploit against the Aztec Private Rollup Bridge contract. By exploiting a logic-binding flaw within the escapeHatch() function, the threat actor successfully drained 1,158.00 ETH from the source pool.

Following the exploit, the actor deployed a complex, multi-branch layering and obfuscation strategy utilizing peeling chains, cross-chain bridges, and zero-knowledge privacy protocols (Tornado Cash) to obscure the trail. This report provides an end-to-end on-chain forensic reconstruction of the stolen assets.

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2. Attack Vector & Genesis Funding

The attacker utilized a clean funding pipeline to activate their exploit interface, avoiding direct links to a personal profile.

[HitBTC / Union Chain Proxy Node] 
               │
               ▼ (0.134 ETH Ingress)
[Genesis Wallet: 0x322a4c38...] 
               │
               ▼ (Exploit Call: escapeHatch)
[Aztec Bridge Contract: 0x737901be...]

• Funding Source: HitBTC / Union Chain Proxy Node (Centralized Exchange Sweep)
• Initial Funding Amount: 0.134 ETH (~$220.72 USD)
• Genesis Funding TxID: 0x322a4c383749bdfe51882a56892af96cfb4290635fd11306eeab33c91801a6ad
• Target Wallet Activation: June 17, 2026 @ 06:21:11 UTC
• Exploit Target Contract: Aztec Private Rollup Bridge (0x737901bea3eeb88459df9ef1BE8fF3Ae1B42A2ba)
• Vulnerability: escapeHatch() logic-binding flaw
• Exploit Execution TxID: 0xab306cd2184d23b6ba3e151b10b3b9a0b81f211cc16f4f3b0c79f0b17a59c2b5

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3. Capital Layering & Fragmentation (Phase 4)

Immediately following the exploit, the capital was split into two distinct operational branches to frustrate manual on-chain tracing.

                              ┌───► [Branch A: Transit Node 0x1593...] ───► Reconverged at Nexus
                              │
[Drained 1,158 ETH Pool] ─────┤
                              │
                              └───► [Branch B: Transit Node 0x33d6...] ───► Tornado Cash (10-ETH Pool)

Branch A: High-Velocity Transit Line

• Transit Node Address: 0x15930A0fEF3421F48c6553b5691682CC1b22EDb3
• Consolidation Outflow TxID: 0xf76ff4962c5b37f7cd1a7681a9e56194c1991f538fdc2b09829094525a071c96
• Execution: 99.99% of the ingress liquidity was swept immediately in a single transaction to a third-generation Externally Owned Account (EOA) to maintain speed.

Branch B: Delayed Peel Strategy

• Transit Node B Address: 0x33d6A0D9BC210E823e043d604179cd844eb467df
• Aggregation Destination: 0x9ED8E94A2d296bf0Be71EB3424Dc67347acce4F8
• Execution: Branch B utilized temporal fracturing, splitting the money across a primary sweep (0xc0aebbad...) and a secondary micro-peel (0xda26647d...).
• Branch B End-State: The tracking vector terminates at Tornado Cash's 10-ETH fixed pool (TxID: 0x46d3c7ef...). The trail for this branch is officially cold with 0.09712 ETH left as static dust in the EOA.

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4. The Master Liquidity Nexus & Siphon Tracks

While Branch B was mixed, the remainder of Branch A and the primary stolen funds reconverged at a massive master clearing vault.

• Master Nexus Vault Address: 0x69923e5264b6E1634Ee673F34fc6350Cb7A05f72
• Current Cold Ledger Balance: 1,019.08 ETH (~$1.66M USD retained in place)

The attacker has begun systematically siphoning out the vault inventory via two specialized outbound tracks:

┌────────────────────────────────────────────────────────────────────────┐
│                      MASTER NEXUS VAULT (0x69923e52...)               │
└───────────────────┬────────────────────────────────┬───────────────────┘
                    │                                │
                    ▼ (Siphon Track Alpha)           ▼ (Siphon Track Beta)
          [Shell Account: 0x7E7F...]       [Shell Account: 0xd5be...]
                    │                                │
                    ▼                                ▼
          [Relay Cross-Chain Bridge]       [Tornado Cash Router Mixer]
                    │                                │
                    ▼                                ▼
            MIGRATED AWAY FROM L1                 TRAIL COLD

Siphon Track Alpha (Cross-Chain Migration)

• Intermediate Shell Account: 0x7E7F606d...864dA70D8 (Now Cleared)
• Volume: ~$62,135.32 USD (TxID: 0xac4a5dd1...)
• Exit Interface: Relay Protocol (Depository Contract)
• Final Mainnet Disposal TxID: 0xf525a0d53b868bd4899f1466e6c7740905351e4a8c8c4664fa4fba02b7cc581c
• Status: Capital migrated off Ethereum Layer 1 via out-lane bridge.

Siphon Track Beta (Privacy Protocol Fracture)

• Intermediate Shell Account: 0xd5be113ED07f580e8545A3872AF359215be057d5
• Volume: 45.05 ETH
• Laundering Tactic: Multi-Pool Fixed Deposit Fracturing
• Pool Breakdown: 3 x 10-ETH Pool Deposits, 5 x 1-ETH Pool Deposits
• Status: Trail cold. Cryptographic link broken at the Tornado Cash Router.

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🛡️ 5. Technical Indicators of Compromise (IoCs)

Type	Contract/Wallet Address / TxID	Role inside Incident
Exploit Target	0x737901bea3eeb88459df9ef1BE8fF3Ae1B42A2ba	Aztec Bridge Contract (Exploited)
Master Vault	0x69923e5264b6E1634Ee673F34fc6350Cb7A05f72	Aggregation Nexus holding ~$1.66M USD
Exploit TxID	0xab306cd2184d23b6ba3e151b10b3b9a0b81f211cc16f4f3b0c79f0b17a59c2b5	The state transaction that drained the contract
Transit Node A	0x15930A0fEF3421F48c6553b5691682CC1b22EDb3	High-velocity intermediate staging EOA
Transit Node B	0x33d6A0D9BC210E823e043d604179cd844eb467df	Layering account feeding Tornado Cash

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🏁 6. Incident Status Matrix

Dimension	Intelligence Profile Metric
Incident Status	Active Tracking (Nexus Node holds 1,019.08 ETH)
Primary Platforms Used	Aztec Rollup Bridge, Tornado.Cash, Relay Protocol
Laundering Vectors Captured	Delayed Peeling, Fixed-Pool Privacy Deposits, Layer-1 Cross-Chain Bridging
Mitigation Action Required	Blacklist Master Vault 0x69923e52... across centralized monitoring tools (Chainalysis, Arkham, Tornado blacklists).

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Disclaimer: This file contains on-chain forensic telemetry for blockchain security tracking and education portfolio documentation.