![]() When a machine is infected with WannaCry, a prompt will appear on the locked computer screen asking for a payment to unlock the device.īetween May 12 and May 15, thousands of organizations, including hospitals and commercial businesses, reported their computers were held ransom by WannaCry. The May 12 version of WannaCry is largely the same as older samples obtained by Symantec, including that it uses a comparable password to encrypt files embedded in the dropper. The executable computer code for EternalBlue was posted online by a mysterious group known as the Shadow Brokers in mid-April. The latest version of WannaCry released incorporated a leaked exploit known as “EternalBlue,” which leverages two known Microsoft vulnerabilities to spread the ransomware to unpatched computers connected to a shared, infected network. Symantec believes that early samples of WannaCry were sent by the same group responsible for the more recent outbreak. “These earlier attacks involved significant use of tools, code, and infrastructures previously associated with the Lazarus group, while the means of propagation through backdoors and stolen credentials is consistent with earlier Lazarus attacks.” “The discovery of a small number of earlier WannaCry attacks has provided compelling evidence of a link to the Lazarus group,” a blogpost by Symantec Security Response team reads. In addition, both the February and March WannaCry campaigns relied on a command and control infrastructure linked to older Lazarus Group operations. For example, researchers believe that at least one remote access trojan used to deploy WannaCry in recent months is an upgraded version of a capability solely controlled and originally designed by the Lazarus Group. ![]() Symantec also collected data on a series of other WannaCry infections in late March, which similarly carried backdoor implants built with computer code previously linked to North Korea. The attacks against Sony Pictures have been widely attributed to hackers linked to North Korea by both private sector cybersecurity firms and the FBI, though no definitive proof has ever publicly surfaced. By obtaining an early sample, analysts were able to comprehensively study and identify individual components within the malware, some of which shared similarities to hacking tools used in late 2014 against Sony Pictures. Researchers originally came across WannaCry in February when it was first found on a Symantec client’s network - a full three months prior to the global outbreak. cybersecurity firm Symantec said it too discovered “strong links” between WannaCry ransomware and the so-called Lazarus Group. Their theory gained new found credibility Monday when U.S. Some organizations track North Korean clusters or groups, such as Bluenoroff, APT37, and APT38 separately, while other organizations track some activity associated with those groups as Lazarus Group.In the aftermath of a global ransomware attack, which impacted more than 300,000 computers in over 150 countries, a small, select group of security researchers announced they had found evidence suggesting a group previously linked to the North Korean government was likely behind the international cyber incident. Some organizations use Lazarus Group to refer to any activity attributed to North Korea. North Korean group definitions have significant overlap, and the name Lazarus Group encompasses a broad range of activity. In late 2017, Lazarus Group used the disk-wiping tool KillDisk in an attack against an online casino based in Central America. Malware used by Lazarus Group has correlated to other reported campaigns, including Operation Flame, Operation 1Mission, Operation Troy, DarkSeoul, and Ten Days of Rain. The group has been active since at least 2009, and was reportedly responsible for the November 2014 destructive wiper attack against Sony Pictures Entertainment as part of the campaign Operation Blockbuster, which was named by Novetta. Lazarus Group is a threat group that has been attributed to the North Korean government.
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