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Decentralized exchange aggregator Jupiter has issued a warning to users about a malicious Chrome extension called “Bull Checker” that has successfully bypassed Solana security measures and drained the wallets of several users.
According to an Aug. 20 <a href="https://www.jupresear.ch/t/identification-of-malicious-extension/21584" rel="noopener noreferrer nofollow">post</a> by Jupiter’s pseudonymous founder Meow, the extension targets <a href="https://insidebitcoins.com/news/solana-price-prediction-vaneck-says-sol-etf-still-in-play-despite-cboe-filing-removal-and-this-new-meme-coin-passes-500k-in-a-week" rel="noopener noreferrer nofollow">Solana</a> users on Reddit and is falsely promoted as a tool to view specific meme coin holders.
<h2 id="span-style-font-weight-400-bull-checker-extension-able-to-get-past-solana-drainer-checks-span">Bull Checker Extension Able To get Past Solana Drainer Checks</h2>
Meow said the extension was able to bypass <a href="https://insidebitcoins.com/news/top-t%cd%8frending-cry%cd%8fp%cd%8ftos%cd%8f-on-solana-chain-today-%cd%8f-fluffington%cd%8f-%cd%8fmad-crypto-all-stars%cd%8f-x%cd%8fia%cd%8fopan%cd%8fg" rel="noopener noreferrer nofollow">Solana</a> simulation checks to “appear normal.” He subsequently urged his followers to immediately remove the browser add-on if they installed it.&nbsp;
<blockquote class="twitter-tweet" data-width="550" data-dnt="true">
 Over the past few days, our team and mods headed by <a href="https://twitter.com/0xSoju?ref_src=twsrc%5Etfw" rel="noopener noreferrer nofollow">@0xSoju</a> &amp; <a href="https://twitter.com/0xYankee?ref_src=twsrc%5Etfw" rel="noopener noreferrer nofollow">@0xYankee</a> have spent endless hours trying to find out the root cause of some attacks on Solana DeFi users.
 With the help of <a href="https://twitter.com/Offside_Labs?ref_src=twsrc%5Etfw" rel="noopener noreferrer nofollow">@offside_labs</a>, <a href="https://twitter.com/blowfishxyz?ref_src=twsrc%5Etfw" rel="noopener noreferrer nofollow">@blowfishxyz</a> &amp; others, we have identified a malicious extension called "Bull… <a href="https://t.co/jmzOWKE7P8" rel="noopener noreferrer nofollow">https://t.co/jmzOWKE7P8</a> <a href="https://t.co/KKiHJhI7dx" rel="noopener noreferrer nofollow">pic.twitter.com/KKiHJhI7dx</a>
 — meow 喵 (@weremeow) <a href="https://twitter.com/weremeow/status/1825616807002255512?ref_src=twsrc%5Etfw" rel="noopener noreferrer nofollow">August 19, 2024</a>
</blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
Users of the extension can interact with decentralized applications as they usually would.
 With each transaction on the decentralized applications, the simulation would appear normal as well. However, users run the risk of having their tokens transferred to another wallet when the transaction is completed.
Meow said that the Bull Checker extension would ask users to accept “read and write” data, and added that a legitimate wallet-monitoring extension would only ever ask for “read-only” permission.
<h2 id="span-style-font-weight-400-amount-of-crypto-lost-to-hacks-has-almost-doubled-since-the-start-of-2024-span">Amount Of Crypto Lost To Hacks Has Almost Doubled Since The Start Of 2024</h2>
The investigation found that the Reddit account Solana_OG was marketing the malicious Chrome extension.
 Examples of transactions that were tampered with reveal that Bull Checker added its own custom instructions to legitimate Jupiter and Raydium transactions. This led to the unauthorized transfer of tokens and authority to a malicious address.
This Bull Checker exploit is part of the growing number of scams and hacks in the crypto space this year. 
A report by <a href="https://www.chainalysis.com/blog/2024-crypto-crime-mid-year-update-part-1/" rel="noopener noreferrer nofollow">Chainalysis</a> revealed that the value of crypto that has been lost to hacks has nearly doubled to $1.6 billion in just the first 7 months of 2024. 
The surge in crypto-related crimes is due to the rising value of cryptos since the start of the year, the report said.
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Malicious Chrome Extension ”Bull Checker” Bypasses Solana Security, Drains User Wallets

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