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Over 40 Malicious Firefox Extensions Target Cryptocurrency Wallets, Stealing User Assets

cryptonews100_tggfrn by cryptonews100_tggfrn
July 3, 2025
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Over 40 Malicious Firefox Extensions Target Cryptocurrency Wallets, Stealing User Assets
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Jul 03, 2025Ravie LakshmananBrowser Safety / Cryptocurrency

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Malicious Firefox Extensions

Cybersecurity researchers have uncovered over 40 malicious browser extensions for Mozilla Firefox which are designed to steal cryptocurrency pockets secrets and techniques, placing customers’ digital property in danger.

“These extensions impersonate reliable pockets instruments from widely-used platforms corresponding to Coinbase, MetaMask, Belief Pockets, Phantom, Exodus, OKX, Keplr, MyMonero, Bitget, Leap, Ethereum Pockets, and Filfox,” Koi Safety researcher Yuval Ronen said.

The big-scale marketing campaign is claimed to have been ongoing since a minimum of April 2025, with new extensions uploaded to the Firefox Add-ons retailer as just lately as final week.

Cybersecurity

The recognized extensions have been discovered to artificially inflate their reputation, including lots of of 5-star opinions that go far past the entire variety of energetic installations. This technique is employed to present them an phantasm of authenticity, making it seem to be they’re extensively adopted and tricking unsuspecting customers into putting in them.

One other tactic adopted by the menace actor to bolster belief includes passing off these add-ons as reliable pockets instruments, utilizing the identical names and logos.

The truth that a few of the precise extensions had been open-source allowed the attackers to clone their supply code and inject their very own malicious performance to extract pockets keys and seed phrases from focused web sites and exfiltrate them to a distant server. The rogue extensions have additionally been discovered to transmit the victims’ exterior IP addresses.

In contrast to typical phishing scams that depend on pretend web sites or emails, these extensions function contained in the person’s browser—making them far more durable to detect or block with conventional endpoint instruments.

“This low-effort, high-impact strategy allowed the actor to take care of anticipated person expertise whereas lowering the probabilities of rapid detection,” Ronen stated.

The presence of Russian language feedback within the supply code in addition to metadata obtained from a PDF file retrieved from the command-and-control (C2) server used for the exercise factors to a Russian-speaking menace actor group.

Cybersecurity

All of the recognized add-ons excluding MyMonero Pockets have since been taken down by Mozilla. Final month, the browser maker said it has developed an “early detection system” to detect and block rip-off crypto pockets extensions earlier than they achieve reputation amongst customers and are used to steal customers’ property by tricking them into coming into their credentials.

To mitigate the danger posed by such threats, it is suggested to put in extensions solely from verified publishers and vet them to make sure that they do not silently change their conduct post-installation.

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