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February 11, 2019
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A security researcher has discovered yet another cryptocurrency-stealing malware on the official Google Play Store that was designed to secretly steal bitcoin and cryptocurrency from unwitting users.
The malware, described as a "Clipper," masqueraded as a legitimate cryptocurrency app and worked by replacing cryptocurrency wallet addresses copied into the Android clipboard with one belonging to attackers, ESET researcher Lukas Stefanko explained in a
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Since cryptocurrency wallet addresses are made up of long strings of characters for security reasons, users usually prefer copying and pasting the wallet addresses using the clipboard over typing them out.
The newly discovered clipper malware, dubbed Android/Clipper.C by ESET, took advantage of this behavior to steal users cryptocurrency.
To do this, attackers first tricked users into installing the malicious app that impersonated a legitimate cryptocurrency service called MetaMask, claiming to let users run Ethereum decentralized apps in their web browsers without having to run a full Ethereum node.
Officially, the legitimate version of MetaMask is only available as a web browser extension for Chrome, Firefox, Opera, or Brave, and is not yet launched on any mobile app stores.
However, Stefanko spotted the malicious MetaMask app on Play Store targeting users who want to use the mobile version of the service by changing their legitimate cryptocurrency wallet address to the hacker's own address via the clipboard.
As a result, users who intended to transfer funds into a cryptocurrency wallet of their choice would instead make a deposit into the attacker's wallet address pasted by the malicious app.
"Several malicious apps have been caught previously on Google Play impersonating MetaMask. However, they merely phished for sensitive information with the goal of accessing the victims' cryptocurrency funds," Stefanko
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"Android Clipper targeted Bitcoin and Ethereum cryptocurrency addresses when being copied in to clipboard and replaced them with the attacker’s wallet address. Once this transaction is sent, it can not be canceled."
Stefanko spotted the malicious MetaMask app, which he believes was the first Android Trojan Clipper to be discovered on Play Store, shortly after its introduction to the app store on February 1.
Google took down the malicious app almost immediately after being notified by the researcher.
While the bitcoin price has been dropped steadily since hitting its all-time high in December 2017, there is no reduction (in fact rise) in the cryptocurrency scandals, thefts, and scams that continue to plague the industry.
Just last week, The Hacker News reported how customers of the largest Canadian bitcoin exchange
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