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We've seen cases when ransomware encrypted local files on user desktop machines and the encrypted versions of the data were synched by the OneDrive application to Microsoft 365 cloud. Other ransomware strains, such as Netwalker, attack backup data repositories in order to inhibit the victims’ ability to recover data without paying the ransom.Īlthough ransomware doesn't specifically target Microsoft 365 data, it can affect Exchange Online, Sharepoint Online and other cloud data, as well as use Microsoft 365 to spread.įiles encrypted locally can be synched to M365 Site/OneDrive The typical on-premise targets normally include:įor example, Ryuk ransomware (see section 2 for details) is known to target financial data and database servers in an attempt to encrypt the most valuable data. The criminals operating ransomware usually prioritize on-premise data sources because they are less protected, and contain valuable information). Many ransomware strains (see the next section for details) are human-operated, where criminals are manually directing the attacks and select what machines ransomware infects first. There is no evidence of any successful ransomware attacks on Microsoft (Office 365) or other SaaS applications While some ransomware strains target specific data types (backup tapes, enterprise database servers, etc), no ransomware specializes in cloud data sources or M365 yet. There has been no knows cases of ransomware attacks targeting Microsoft 365 data or other cloud applications. In this blog post we will discuss how ransomware impacts Microsoft 365, what protection M365 has against it, and how ransomware criminals' tactic evolves over time.
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We at afi.ai develop a Microsoft 365 backup and one of the reasons our customers use our service is to protect their M365 data from ransomware.Īs part of our business we observe ransomware attacks and see how they impact organizations - often organizations decide to implement a Microsoft 365 backup after they experience an attack. In this blog post we will review evidence from 2015-2021 ransomware attacks, discuss the scope of Microsoft 365 ransomware protection and the evolution of ransomware which threatens Microsoft 365 data. So do the built-in protection & recovery capabilities make Microsoft 365 data immune to ransomware attack? The short answer right now, in most cases, is yes.
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Unlike the on-premise infrastructure, Microsoft 365 applications have native versioning, recovery tools, and anti-malware built into them. Other businesses, such as retail, manufacturing, education and hospitality showed to be lower on the target list, according to Beazley 2018 Breach Briefing.Ransomware is a real threat for traditional on-premise IT infrastructure because the hardware storage used in PCs and physical servers has no built-in versioning or protection mechanisms against malware.
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So after paying the ransom, it was determined that backup files were corrupted so restoring was unsuccessful.Īlong with healthcare organizations, financial and professional services also tend to be targeted. Hospital officials said they paid the attackers because restoring from backups would’ve taken days or weeks, and the organization needed access to the files much sooner. The first theory proved to be true in one case when SamSam authors collected $55,000 in ransom from Hancock Health, a regional hospital in Indiana, earlier this year. There are many theories as to why healthcare organizations are targeted, such as willingness to pay large sums quickly and being notorious for using out-of-date systems. So it seems that there’s no known requirement that an organization must have in order to become the victim of a targeted group ransomware attack, but healthcare systems are evident in the trend. This destructive form of malware is just too cunning for even some of the most vigilant security software.Īs a result, 75 percent of organizations infected with ransomware were running up-to-date endpoint protection, according to a Sophos report. Then, it could be weeks or even months before the user is aware of the attack.īut while all is quiet, the targeted groups are preparing for the attack, ensuring that once deployed, the ransomware will have maximum impact on the business.ĭue to the stealthy nature of the group’s preparations, the chances of ransomware payloads being detected and blocked prior to deployment are becoming increasingly low. Targeted groups usually lay low for a while after they make initial compromise. This group’s attack plot is stealthier and requires a great amount of hands-on setup and investigation. Targeted groups zero in on organizations that they believe are willing to pay big money to get their files in a hurry, such as businesses, healthcare organizations and local governments.