Opera.com hacked, distributed malware signed with their certificate to probably thousand of users

According to a post on the Opera Security Blog, the company suffered on June 19th “a targeted attack on  internal network infrastructure”. The attackers were able to obtain at least one old and expired Opera code signing certificate, which they have used to sign some malware. This has allowed them to distribute malicious software which incorrectly appears to have been published by Opera Software, or appears to be the Opera browser.


What Opera is describing here is the nightmare of any company having millions of users:

– Internal network breached

– Signing certificates stolen

Certificates used to sign malware

Can it go worse?

Yes, it can.

– the website distributed automatically company signed malware to their users:

It is possible that a few thousand Windows users, who were using Opera between 01.00 and 01.36 UTC on June 19th, may automatically have received and installed the malicious software.


If you are or were using Opera, here is what can you do to make sure your computer is clean:

– Uninstall Opera

– Install any Avira product from here.

– Start the “System Scanner” to scan all your computer on demand


– If you see a detection of TR/Ransom.GR.1, then here you go: you’ve been affected. Let the scanner remove all the files found.

– After cleaning up the computer, you may want to reinstall the Opera browser. Do note that there are plenty of alternatives like Firefox, Chrome and others.


Sorin Mustaca

IT Security Expert

via Avira – TechBlog http://techblog.avira.com/2013/06/27/opera-com-hacked-distributed-malware-signed-with-their-certificate-to-probably-thousand-of-users/en/

© Copyright Sorin Mustaca, All rights Reserved. Written For: Sorin Mustaca on Cybersecurity

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About the Author

Sorin Mustaca
Sorin Mustaca, (ISC)2 CSSLP, CompTIA Security+ and Project+, is working since over 20 years in the IT Security industry and worked between 2003-2014 for Avira as Product Manager for the known products used by over 100 million users world-wide. Today he is CEO and owner of Endpoint Cybersecurity GmbH focusing on Cybersecurity, secure software development and security for IoT and Automotive. He is also running his personal blog Sorin Mustaca on Cybersecurity and is the author of the free eBook Improve your security .

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