Cryptocurrency users are being targeted by a highly sophisticated, widespread cybercriminal campaign with the goal of deploying malware capable of grabbing exchange and wallet information, essentially robbing the people of their tokens, experts from Check Point have warned.
Apparently active since March 2024, what makes this campaign, dubbed JSCEAL by the researchers, unique is the use of compiled JavaScript files (JSC), which allows the malware to remain hidden from most traditional antivirus solutions.
The criminals created fake cryptocurrency exchange and wallet apps, which come with an infostealer. They also created websites to host these apps, and managed to purchase thousands of advertisements on the internet to promote the scam. Check Point says that just in the European Union (EU), 35,000 malicious ads were served between January and June 2025.
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JSCEAL malware
“The use of Facebook’s Ad Library enabled us to estimate the campaign’s reach, while in a very conservative approach we can estimate the total reach of the malvertising campaign at 3.5 million users within the EU alone, and likely above 10 million users worldwide,” the researchers explained.
People who fall for the scam download an MSI installer which triggers “a sequence of profiling scripts” that gather critical system information. These scripts also use PowerShell commands to collect and exfiltrate data, in preparation of the final payload deployment.
This final payload is the JSCEAL malware, which steals crypto-related data such as credentials and private keys. The payload is executed through Node.js, it was said.
What makes this malware particularly dangerous is the use of compiled JavaScript files.
“The JSCEAL campaign uses compiled V8 JavaScript (JSC) files, a lesser-known feature of Google’s V8 engine that enables code obfuscation and evasion of static analysis,” the researchers added.
“This innovative technique allows attackers to bypass detection systems, making it extremely challenging to detect the malicious code until it executes. JSCEAL is notable for its scale, technical complexity, and persistence, having evolved significantly since its discovery.”
Even today, many versions of the malware remain undetected by common security tools.
Anyone concerned their data may be under threat should ensure their antivirus protections are up to date – we’ve rounded up the best free antivirus software around – and for those who prefer using Apple technology, also the best Mac antivirus software.
