Menu
Malware distributors are switching to less suspicious file types

Malware distributors are switching to less suspicious file types

Recent email-based malware distribution campaigns have used malicious LNK and SVG attachments instead of JavaScript

After aggressively using JavaScript email attachments to distribute malware for the past year, attackers are now switching to less suspicious file types to trick users.

Last week, researchers from the Microsoft Malware Protection Center warned about a new wave of spam emails that carried malicious .LNK files inside ZIP archives. Those files had malicious PowerShell scripts attached to them.

PowerShell is a scripting language for automating Windows system administration tasks. It has been abused to download malware in the past and there are even malware programs written entirely in PowerShell.

In the recent campaign seen by Microsoft, the malicious LNK files contained a PowerShell script that downloaded and installed the Kovter click fraud trojan. The same technique has been used in the past to distribute the Locky ransomware.

On Thursday researchers from Intel Security warned that PowerShell can also be used in so-called fileless attacks, where the malicious code is launched directly into memory and nothing is saved to disk for endpoint security products to detect.

"You may think that you are protected from fileless malware because your PowerShell execution policies are set to 'Restricted' so that scripts can’t run," the Intel Security researchers said in a blog post. "However, attackers can easily bypass these policies."

Another file type used to distribute malware in recent months has been SVG (Scalable Vector Graphics). While many people correctly associate .SVG files with images, it's a little-known fact that such files can actually contain JavaScript.

Attackers have been using SVG files to execute obfuscated JavaScript when users open what they believe to be images inside their browsers. These obfuscated scripts are used to launch malicious file downloads, incident responders from the SANS Internet Storm Center warned in a recent report.

Google plans to block JavaScript file attachments in Gmail starting February 13, regardless of whether they're attached directly or within archive files like ZIP. Such restrictions from email providers will likely force cybercriminals to find alternative file formats that allows hiding malicious code.

Banning LNK or JS file attachments is easy, because it's rare for people to send such files via email. However, banning SVG might prove impractical since it's a widely used image format.


Follow Us

Join the New Zealand Reseller News newsletter!

Error: Please check your email address.

Featured

Slideshows

Sizing up the NZ security spectrum - Where's the channel sweet spot?

Sizing up the NZ security spectrum - Where's the channel sweet spot?

From new extortion schemes, outside threats and rising cyber attacks, the art of securing the enterprise has seldom been so complex or challenging. With distance no longer a viable defence, Kiwi businesses are fighting to stay ahead of the security curve. In total, 28 per cent of local businesses faced a cyber attack last year, with the number in New Zealand set to rise in 2017. Yet amidst the sensationalism, media headlines and ongoing high profile breaches, confusion floods the channel, as partners seek strategic methods to combat rising sophistication from attackers. In sizing up the security spectrum, this Reseller News roundtable - in association with F5 Networks, Kaspersky Lab, Tech Data, Sophos and SonicWall - assessed where the channel sweet spot is within the New Zealand channel. Photos by Maria Stefina.

Sizing up the NZ security spectrum - Where's the channel sweet spot?
Kiwi channel comes together for another round of After Hours

Kiwi channel comes together for another round of After Hours

The channel came together for another round of After Hours, with a bumper crowd of distributors, vendors and partners descending on The Jefferson in Auckland. Photos by Maria Stefina.​

Kiwi channel comes together for another round of After Hours
Consegna comes to town with AWS cloud offerings launch in Auckland

Consegna comes to town with AWS cloud offerings launch in Auckland

Emerging start-up Consegna has officially launched its cloud offerings in the New Zealand market, through a kick-off event held at Seafarers Building in Auckland.​ Founded in June 2016, the Auckland-based business is backed by AWS and supported by a global team of cloud specialists, leveraging global managed services partnerships with Rackspace locally.

Consegna comes to town with AWS cloud offerings launch in Auckland
Show Comments