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The true purpose of the WannaCry attack may never be known – was it ransomware gone wrong or a deliberate destructive attack disguised as ransomware? ExPetr

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There are also a number of indicators, including early code similarities that suggest the group behind WannaCry is the infamous Korean-speaking threat actor Lazarus.

The code was poor in places, and there are suggestions that it escaped into the wild before it was fully ready. Estimates suggest it only made around $55,000 in bitcoin, hampered by its high visibility. Spreading via a worm is not advisable for a threat that is most lucrative when silently stalking the shadows. As a ransomware plot to make lots of money, it was a failure. The unanswered questions about WannaCryĪs a devastating high profile attack targeting businesses, WannaCry was extremely successful. A month after the initial outbreak had been contained, WannaCry was still claiming victims, including Honda, which was forced to shut down one of its production facilities, and 55 speed cameras in Victoria, Australia. German transport giant Deutsche Bahn, Spain’s Telefonica, the West Bengal power distribution company, FedEx, Hitachi and the Russian Interior Ministry were all hit, too. Reports suggests the ultimate number of victims could be as high as three-quarters of a million.Ĭar maker Renault had to close its largest factory in France and hospitals in the UK had to turn away patients. Victims received a ransom demand to be paid in bitcoins. These often run on legacy OS and are therefore particularly vulnerable. The ransomware also hit embedded systems. The attack was industry-agnostic, and victims were mainly organizations with networked systems.

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Full decryption of the affected files was impossible without paying the ransom – although our analysts discovered several flaws in WannaCry’s code that could allow some victims to restore some of their data without paying the ransom.

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Microsoft had released an update to fix this vulnerability back in March 2017, but the number of unpatched machines remained so high that this hardly hindered the propagation of WannaCry.Īfter infecting a machine and executing a routine to spread further, WannaCry encrypted some valuable files belonging to the victim and displayed a ransom note. To infect a machine, WannaCry exploited a vulnerability in the Windows implementation of the SMB protocol. The worm automatically targeted all computers sharing the same local subnet as the infected machine, as well as random IP ranges outside the local network – spreading it rapidly across the world. To propagate, the worm used an exploit dubbed EternalBlue and a backdoor DoublePulsar, both of which had been made public by the Shadow Brokers group a month prior to the outbreak. The WannaCry epidemic affected hundreds of thousands of computers around the globe.

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On this occasion the worm was designed to install the WannaCry crypto-ransomware on infected machines. It all started on May 12, when the security community observed something it hadn’t seen for almost a decade: a cyberattack with a worm that spread uncontrollably. The massive outbreaks that were not all they seemed WannaCry This short paper highlights some of the key moments. It was also a year of consistently high attack numbers, but limited innovation. Welcome to ransomware in 2017 – the year global enterprises and industrial systems were added to the ever-growing list of victims, and targeted attackers started taking a serious interest in the threat. The cost to victims of these three attacks is already running into hundreds of millions of dollars. At least one of the attacks carried flaws that suggest it may have been released too soon, another spread via compromised business software, two are related and the two biggest appear to have been designed for data destruction. The perpetrators of these attacks are unlikely to be the common thieves usually lurking behind ransomware. The attacks targeted businesses and used worms and recently leaked exploits to self-propagate, encrypting data and demanding a ransom they didn’t really want. Three unprecedented outbreaks transformed the landscape for ransomware, probably forever. In 2017, the ransomware threat suddenly and spectacularly evolved.

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Download the Kaspersky Security Bulletin: Story of the year 2017 Introduction: what we learned in 2017