Menu
New JavaScript spam wave distributes Locky ransomware

New JavaScript spam wave distributes Locky ransomware

European countries are the most affected, but detections have also been recorded in the U.S. and Canada

Over the past week, computers throughout Europe and other places have been hit by a massive email spam campaign carrying malicious JavaScript attachments that install the Locky ransomware program.

Antivirus firm ESET has observed a spike in detections of JS/Danger.ScriptAttachment, a malware downloader written in JavaScript that started on May 22 and peaked on May 25.

Many countries in Europe have been affected, with the highest detection rates being observed in Luxembourg (67 percent), the Czech Republic (60 percent), Austria (57 percent), the Netherlands (54 percent) and the U.K. (51 percent). The company's telemetry data also showed significant detection rates for this threat in Canada and the U.S.

JS/Danger.ScriptAttachment can download various malware programs, but recently it has been used to primarily distribute Locky, a widespread, malicious program that uses strong encryption to hold users' files hostage.

While Locky doesn't have any known flaws that would allow users to decrypt their files for free, security researchers from Bitdefender have developed a free tool that can prevent Locky infections in the first place. The tool makes the computer appear as if it's already infected by Locky by adding certain harmless flags, which tricks the malware into skipping it.

The use of JavaScript-based attachments to distribute Locky began earlier this year, prompting Microsoft to post an alert about it in April.

The attachments are usually .zip archive files that contain .js or .jse files inside. These files with will execute directly on Windows without the need of additional applications.

However, it is very uncommon for people to send legitimate applications written in JavaScript via email, so users should avoid opening this kind of files.


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Featured

Slideshows

Meet the leading female front runners of the Kiwi channel

Meet the leading female front runners of the Kiwi channel

Reseller News honoured the leading female front runners of the New Zealand channel at the 2018 Women in ICT Awards (WIICTA) in Auckland. The awards honoured standout individuals across seven categories, spanning Entrepreneur; Innovation; Rising Star; Shining Star; Community; Technical and Achievement.

Meet the leading female front runners of the Kiwi channel
Meet the top performing customer-centric Microsoft channel partners

Meet the top performing customer-centric Microsoft channel partners

Microsoft honoured leading partners across the channel following a year of customer innovation and market growth in New Zealand. The 2018 Microsoft Partner Awards recognised excellence within the context of the end-user, spanning a host of emerging and established providers.

Meet the top performing customer-centric Microsoft channel partners
Reseller News launches new-look Awards at 2018 Judges’ Lunch

Reseller News launches new-look Awards at 2018 Judges’ Lunch

Introducing the Reseller News Innovation Awards, launched to the channel at the 2018 Judges’ Lunch in Auckland. With more than 70 judges now part of the voting panel, the new-look awards will reflect the changing dynamics of the channel, recognising excellence across customer value and innovation - spanning start-ups, partners, distributors and vendors.

Reseller News launches new-look Awards at 2018 Judges’ Lunch
Show Comments