Attacks/Breaches

4/12/2018
09:00 AM
50%
50%

New Email Campaign Employs Malicious URLs

A new attack dropping the Quant Loader Trojan bypasses scanners and sandboxes.

When it comes to malware, email still reigns supreme as the delivery mechanism of choice. The reasoning is simple: It's cheap, it's easily spoofed, and recipients are accustomed to getting messages from various sources. That means when a new attack is found, there's a good possibility that it will spread successfully.

Researchers at Barracuda Networks found, through analyzing attacks on its customer network, a new Quant Loader Trojan campaign using Samba shares as a mechanism - rather than the more common http:// protocol. The result could be a new wave of ransomware attempts, a new round of keystroke loggers, or worse.

The new campaign has similarities to the FlawedAmmyy RAT campaign identified by Proofpoint several weeks ago. In both campaigns, the file:// URL prefix is used to trigger a file download via either SMB protocol or Samba. According to Fleming Shi, senior vice president of advanced technology at Barracuda, this mechanism has several benefits to the attacker when compared to traditional Web downloads.

First, because the URL is malformed and doesn't involve the http:// prefix, it isn't flagged by many defense systems as malicious. "So when they actually analyzed the file, analyzed the behavior, they found it not malicious because the URL was not active," Shi says. "At a later date they'll activate the URL, do the secondary download, and launch the attack."

Quant Loader itself is a Trojan that can be used to distribute a variety of malware payloads, including ransomware and password stealers. It is sold on underground forums and allows the user to configure the payload(s) upon infection using a management panel.

Stephen Boyer, CTO and co-founder of Bitsight, says that it's no wonder that criminals are still using email as a primary attack vector for malware. "I can send you a message without any previous relationship, or knowledge, or authentication scheme," he says. "So that's that's why it's been so effective."

In spite of the potential danger, email is still the most critical messaging form used by business, so there's no real option that includes simply not looking at, opening, or responding to email.

This latest campaign has not limited itself to a single malware payload, Shi says, so it can't be assumed to all be from a single source. In addition, he says there's a characteristic of this campaign that made it especially interesting to researchers.

"We believe the sophistication in this is the ability to alter the packaging at a pretty rapid pace," Shi says. "And also, this wasn't just one day and they went away - they actually kept going."

He says he and his team saw the campaign repeated over more than three weeks, with evidence of its evolution within that timeframe.

Unlike some recent malware outbreaks that have been geographically targeted, Shi says that this latest campaign has had targets all over the UK and North America. The one constant, he says, is English used as the language in the email, though that could easily be changed in future attacks.

Related Content:

Interop ITX 2018

Join Dark Reading LIVE for an intensive Security Pro Summit at Interop IT X and learn from the industry’s most knowledgeable IT security experts. Check out the agenda here.Register with Promo Code DR200 and save $200.

Curtis Franklin Jr. is Senior Editor at Dark Reading. In this role he focuses on product and technology coverage for the publication. In addition he works on audio and video programming for Dark Reading and contributes to activities at Interop ITX, Black Hat, INsecurity, and ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Diversity: It's About Inclusion
Kelly Jackson Higgins, Executive Editor at Dark Reading,  4/25/2018
Threat Intel: Finding Balance in an Overcrowded Market
Kelly Sheridan, Staff Editor, Dark Reading,  4/23/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
How to Cope with the IT Security Skills Shortage
Most enterprises don't have all the in-house skills they need to meet the rising threat from online attackers. Here are some tips on ways to beat the shortage.
Flash Poll
[Strategic Security Report] Navigating the Threat Intelligence Maze
[Strategic Security Report] Navigating the Threat Intelligence Maze
Most enterprises are using threat intel services, but many are still figuring out how to use the data they're collecting. In this Dark Reading survey we give you a look at what they're doing today - and where they hope to go.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2017-0290
Published: 2017-05-09
NScript in mpengine in Microsoft Malware Protection Engine with Engine Version before 1.1.13704.0, as used in Windows Defender and other products, allows remote attackers to execute arbitrary code or cause a denial of service (type confusion and application crash) via crafted JavaScript code within ...

CVE-2016-10369
Published: 2017-05-08
unixsocket.c in lxterminal through 0.3.0 insecurely uses /tmp for a socket file, allowing a local user to cause a denial of service (preventing terminal launch), or possibly have other impact (bypassing terminal access control).

CVE-2016-8202
Published: 2017-05-08
A privilege escalation vulnerability in Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) releases earlier than v7.4.1d and v8.0.1b could allow an authenticated attacker to elevate the privileges of user accounts accessing the system via command line interface. With affected version...

CVE-2016-8209
Published: 2017-05-08
Improper checks for unusual or exceptional conditions in Brocade NetIron 05.8.00 and later releases up to and including 06.1.00, when the Management Module is continuously scanned on port 22, may allow attackers to cause a denial of service (crash and reload) of the management module.

CVE-2017-0890
Published: 2017-05-08
Nextcloud Server before 11.0.3 is vulnerable to an inadequate escaping leading to a XSS vulnerability in the search module. To be exploitable a user has to write or paste malicious content into the search dialogue.