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Ryuk ransomware develops worm-like capability

The French government’s computer emergency readiness team, that’s part of the National Cybersecurity Agency of France, or ANSSI, has discovered a Ryuk variant that has worm-like capabilities during an incident response. For those unacquainted with Ryuk, it is a type of ransomware that is used in targeted attacks against enterprises and organizations. It was first discovered in the … [Read more...]

The story of ZeroLogon

This is the story of a vulnerability that was brought about by the incorrect use of an encryption technique. After it was discovered by researchers, the vulnerability was patched and that should have been the end of the story. Unfortunately the patch caused problems of its own, which made it very unpopular. Cybercriminals seized the opportunity to use the vulnerability for their own purposes. This … [Read more...]

The most enticing cyberattacks of 2020

In 2020, we experienced a major shift. Much of the world pitched in to limit the spread of the coronavirus, with people changing their daily routines to include a mixture of working from home, standing in socially-distanced lines, and awaiting local rules about what they could and could not do with members of different households. It was a stressful and confusing time, and during it, … [Read more...]

Emotet returns just in time for Christmas

Emotet is a threat we have been tracking very closely throughout the year thanks to its large email distribution campaigns. Once again, and for about two months the botnet stopped its malspam activity only to return days before Christmas. In typical Emotet fashion, the threat actors continue to alternate between different phishing lures whose goal is to social engineer users into enabling … [Read more...]

A week in security (December 7 – December 13)

Last week on Malwarebytes podcast we talked to Doug Levin, founder of the K12 cybersecurity resource center and advisor to the K12 Security Information Exchange, about how schools can plan for a cybersecure 2021. We also released a Malwarebytes Labs report revealing that 50 percent of schools did not prepare for secure distance learning. In our blogs we discussed defending against tax … [Read more...]

VideoBytes: Ryuk Ransomware Targeting US Hospitals

Hello Folks! In this Videobyte, we’re talking about why hospitals are being targeted by the Ryuk ransomware, what tricks they are using to pull this off and what their motivations might be. Ryuk ransomware is being spread to hospitals using targeted phishing emails that infect systems with the BazarLoader malware, which in turn deploys the Cobalt Strike pen-testing platform, giving … [Read more...]

VideoBytes: Is it goodbye forever to Maze ransomware?

Hello Folks! In this Videobyte we’re talking about Maze ransomware and whether or not its shutting down, and what that means for the cybercrime world. The notorious Maze ransomware group, known for its corporate targeting and data leaking extortion schemes is, apparently, shutting down operations. Rumors began months ago that Maze was shutting down, as many affiliates who helped … [Read more...]

RegretLocker, new ransomware, can encrypt Windows virtual hard disks

Cybersecurity researchers discovered a new ransomware last month called RegretLocker that, despite a no-frills package, can do serious damage to virtual hard disks on Windows machines. Through a clever trick, RegretLocker can bypass the often-long encryption times required when encrypting a machine’s virtual hard disks, and it can close any files currently opened by a user to then encrypt … [Read more...]

Hospital ransomware: Gangs are back to target healthcare

Healthcare is not in a good place right now. With some countries and states deciding to go back in to lockdown due to the continued rise of reported COVID-19 infections—and several garnering record-high numbers compared to when almost every country initially went into lockdown—it seems horrible timing that hospital ransomware is back in the news. Early on in the coronavirus crisis, a promise … [Read more...]

New Emotet delivery method spotted during downward detection trend

Emotet, one of cybersecurity’s most-feared malware threats, got a superficial facelift this week, hiding itself within a fake Microsoft Office request that asks users to update Microsoft Word so that they can take advantage of new features. This revamped presentation could point to internal efforts by threat actors to increase Emotet’s hit rate—a possibility supported by Malwarebytes telemetry … [Read more...]