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 New Zealand Reseller News newsletter!

Error: Please check your email address.

Slideshows

Meet the leading HP partners in New Zealand...

Meet the leading HP partners in New Zealand...

HP has recognised its top performing partners in New Zealand at the second annual 2016 HP Partner Awards, held at a glittering bash in Auckland. The HP Partner Awards recognises and celebrates excellence, growth, consistency and engagement of its top partners. This year also saw the addition of several new categories, resulting in 11 companies winning across 11 award categories.

Meet the leading HP partners in New Zealand...
Channel comes together as Ingram Micro Showcase hits Auckland

Channel comes together as Ingram Micro Showcase hits Auckland

Ingram Micro outlined its core focuses for 2017 at Showcase in Auckland, bringing together the channel for a day of engaging keynotes, compelling breakout sessions and new technologies.

Channel comes together as Ingram Micro Showcase hits Auckland
Show Comments