Update — We have published another article with more detailed information on the WannaCry ransomware attack that has become the largest ransomware attack in the history within just a few hours. Moreover, If you are using an unsupported version of Windows Operating system, you are advised to either upgrade to Windows 10 or install the latest emergency patch issued by Microsoft for Windows XP, Vista, and 8, server 2003 and 2008.
Earlier today, a massive ransomware campaign hit computer systems of hundreds of private companies and public organizations across the globe – which is believed to be the most massive ransomware delivery campaign to date.
The Ransomware in question has been identified as a variant of ransomware known as WannaCry (also known as ‘Wana Decrypt0r,’ ‘WannaCryptor’ or ‘WCRY’).
Like other nasty ransomware variants, WannaCry also blocks access to a computer or its files and demands money to unlock it.
In separate news, researchers have also discovered a massive malicious email campaign that’s spreading the Jaff ransomware at the rate of 5 million emails per hour and hitting computers across the globe.
What’s interesting about this ransomware is that WannaCry attackers are leveraging a Windows exploit harvested from the NSA called EternalBlue, which was dumped by the Shadow Brokers hacking group over a month ago.
Microsoft released a patch for the vulnerability in March (MS17-010), but many users and organizations who did not patch their systems are open to attacks.
The exploit has the capability to penetrate into machines running unpatched version of Windows XP through 2008 R2 by exploiting flaws in Microsoft Windows SMB Server. This is why WannaCry campaign is spreading at an astonishing pace.
Once a single computer in your organization is hit by the WannaCry ransomware, the worm looks for other vulnerable computers and infects them as well.
In just a few hours, the ransomware targeted over 45,000 computers in 74 countries, including United States, Russia, Germany, Turkey, Italy, Philippines and Vietnam, and that the number was still growing, according to Kaspersky Labs.
Another independent security researcher, MalwareTech, reported that a large number of U.S. organizations (at least 1,600) have been hit by WannaCry, compared to 11,200 in Russia and 6,500 in China.
Screenshots of the WannaCry ransomware with different languages, including English, Spanish, Italian, were also shared online by various users and experts on Twitter.
Bitcoin wallets seemingly associated with WannaCry were reportedly started filling up with cash.
The Spanish computer emergency response organization (CCN-CERT) has even issued an alert that warns users of the “massive attack of ransomware” from WannaCry, saying (translated version):
“The ransomware, a version of WannaCry, infects the machine by encrypting all its files and, using a remote command execution vulnerability through SMB, is distributed to other Windows machines on the same network.”
It is unclear how the WannaCry ransomware is infecting systems, but obvious attack vector can be phishing emails or victims visiting a website containing malware.
“Power firm Iberdrola and utility provider Gas Natural were also reported to have suffered from the outbreak.,” according to BBC.
First of all, if you haven’t patched your Windows machines and servers against EternalBlue exploit (MS17-010), do it right now.
To safeguard against such ransomware infection, you should always be suspicious of uninvited documents sent an email and should never click on links inside those documents unless verifying the source.
To always have a tight grip on all your important files and documents, keep a good backup routine in place that makes their copies to an external storage device that is not always connected to your PC.
Moreover, make sure that you run an active anti-virus security suite of tools on your system, and most importantly, always browse the Internet safely.