The popular file-sharing service MEGA reported a hacker attack. Attackers managed to replace the official Chromme extension of the service and to collect data on users' crypto-currency wallets.
On 4 September 2018 at 14:30 UTC, an unknown attacker uploaded a trojaned version of MEGA's Chrome extension, version 3.39.4, to the Google Chrome webstore. Upon installation or autoupdate, it would ask for elevated permissions (Read and change all your data on the websites you visit) that MEGA's real extension does not require and would (if permissions were granted) exfiltrate credentials for sites including amazon.com, live.com, github.com, google.com (for webstore login), myetherwallet.com, mymonero.com, idex.market and HTTP POST requests to other sites, to a server located in Ukraine. Note that mega.nz credentials were not being exfiltrated.
Thus, attackers could get access to the popular cryptocurrency wallets MyEtherWallet and MyMonero. Also, users' funds on the decentralized IDEX exchange are under the thread too.
Representatives of the file sharing company stressed that the fake extension was replaced by a genuine one four hours after the substitution. And an hour later, Google reacted and removed the extension from the Chrome store. Note that at the time of publication, the MEGA extension for Chrome in the official store is still not available.
Earlier it was reported that users of MyEtherWallet, using the free VPN-plugin Hola, could become victims of a hacker attack.