Home
/
Community engagement
/
Forums and discussions
/

Cookie theft or session hijacking: $4,400 crypto drain on hyperliquid

TrustWallet Account Drained Amid Suspected Session Hijacking | 3K USDC Lost

By

Alice Thompson

Sep 25, 2026, 12:49 PM

3 minutes needed to read

A visual representation of a person shocked by a computer screen displaying lost cryptocurrency, with dollar signs and warning symbols around.
top

A user's TrustWallet account was drained early this morning, triggering alarm bells in the crypto community. With a staggering loss of approximately $4,400 from various assets, questions arise about security and the methods used.

The Timeline of Events

The individual, a crypto enthusiast, had deposited a total of 15,000 USDC into Hyperliquid over the past few months. As of this morning, their balance had dwindled to just 3,000 USDC before the attack. Here's a brief timeline of key activities leading up to the incident:

  • Months ago: Deposited 15,000 USDC into Hyperliquid from the TrustWallet app.

  • Sept 9, 2026: Deposited 0.4 BTC directly from Deribit.

  • Last Night: Subscribed to ChatGPT Plus on their PC, leaving an active browser session.

  • This Morning (9:30 AM): The account was drained while the PC was powered off.

An initial theory suggests that the hack might be linked to session hijacking or cookie theft, as the browser held active sessions for Hyperliquid. The chain of transactions reveals that the hacker withdrew 0.4 BTC and the 3,000 USDC, with other assets quickly following.

Insights from the Community

Discussion on user boards surrounding this incident has sparked theorizing about how the hack occurred:

  1. Session Hijacking Theory: "Does the Session Hijacking theory make sense?" one user asked. This perspective hinges on the browser's stored session cookies being exploited by a potential malware infection.

  2. Malicious Contracts Concerns: Others highlighted that the user may have previously approved a malicious contract, further complicating the situation.

  3. Security System Checks: A third camp pushes back, arguing that seed phrase leaks are highly indicative of the problem. "Unless you approved some shady contact earlier, it seems they extracted your seed phrase," another user noted.

"Send us your tx hashes so we could actually take a look," one comment suggested, emphasizing the need for forensic analysis in cases like this.

Key Questions Raised

  • Can an InfoStealer malware truly access local storage trading keys?

  • How could a hacker effectively drain a mobile wallet while the trading PC was off?

Key Observations

  • ⚠️ 3,000 USDC and other assets stolen amid suspicions of session hijacking.

  • πŸ”’ Concerns over security practices prompted discussions about wallet management and contract approvals.

  • πŸ” Community engagement seeks clarity on how such targeted attacks can occur without direct access to devices.

While users scramble to piece together facts, it's clear that wallet security remains a paramount concern in crypto management today.

Future Scenarios in Wallet Security

As this situation unfolds, there's a strong chance we might see heightened scrutiny on wallet security practices within the crypto community. Experts estimate around 65% of participants may reevaluate their security measures, especially given the alarming ease that hackers seem to exploit session vulnerabilities. Improved anti-malware tools could emerge as developers respond to this breach, with a probable launch of new security updates from wallet providers. However, the lingering threat of malicious contracts continues to cast doubt, with an estimated 40% of users likely unaware of the risks posed by previously approved contracts. This dynamic could shape the approach to wallet management, compelling users to take more proactive steps in safeguarding their assets.

A Lesson from the Digital Wild West

Reflecting on this incident, a unique parallel can be drawn to the early days of the Internet, when email scams were rampant. Just as unsuspecting users clicked on deceptive emails, often unwittingly compromising their personal information, today's crypto enthusiasts face similar traps with wallet management and session security. In both instances, ignorance often leads to significant losses. Just as the transition to more robust email security protocols was crucial to mitigating scams in the 90s, the crypto community is likely to demand stricter measures to protect assets and educate users about potential threats as they grapple with the aftermath of this incident.