Story image

Bitdefender unravels the mystery of the Zacinlo adware

20 Jun 18

Adware has been around for more than a decade, helping software creators make money as they deliver free apps to users. But now the line between adware and spyware has become increasingly fuzzy as confusing marketing, persistence mechanisms, and aggressive opt-outs become the new normal.

That’s according to Bitdefender, which looked at one particular ad fraud operation called Zacinlo. The Zacinlo malware, which Bitdefender classes as an advanced strain of spyware, has been operating covertly since 2012 and targeting users of free applications, as well as gamers.

“The adware components are silently installed by a downloader that is presented as a free and anonymous VPN service (s5Mark), distributed in an installer. s5Mark has a simple graphical interface used as a decoy for the intrusive unwanted behaviour taking place behind the scenes. Note that a non-technical user is led to believe that a VPN connection is established even though no such thing is even attempted,” Bitdefender explains.

The adware is able to open an invisible browser to load advertising banners, and simulate clicks from the user. It also switches ads users see on webpages for the attacker’s own ads, which means it collects advertising revenue.

Bitdefender says this type of rootkit-based malware is so rare that fewer than 1% of threats use it – and there’s no easy fix. The rootkit is able to install itself on most Windows operating systems, including Windows 10.

“We have identified at least 25 different components found in almost 2,500 distinct samples. While tracking the adware, we noticed some of the components were continuously updated with new functionalities, dropped altogether or integrated entirely in other components,” Bitdefender says in a white paper.

Zacinlo is able to detect targeted antimalware solutions and stop them from launching. Bitdefender’s own solutions, as well as those from Qihoo, Kingsoft, Malwarebytes, Symantec, Panda, HitmaPro, Avast, Avg, Microsoft, Kaspersky, Emsisoft, and Zemana are affected.

While most malware samples have been spotted in the USA, many have been found in the Philippines, Indonesia, India, China, France, Germany, and Brazil.

Bitdefender says there are several main features in Zacinlo that are of interest: firstly, it uses an adware cleanup routine used to remove potential competition in the adware space – which means it gets full exposure and ad revenue.

It is also able to take desktop screenshots that can be sent back to the attackers for analysis; decrypt SSL communications through man-in-the-browser attacks, and redirect pages in browsers.

Notably, the aware is able to mimic normal user behaviours such as scrolling, clicking and keyboard input through hidden webpages in the background.

“This is typical behaviour for advertising fraud that inflicts significant financial damage on online advertising platforms,” Bitdefender says in the white paper.

What MSPs can learn from Datto’s Channel Ransomware Report
While there have been less high profile attacks making the headlines, the frequency of attacks is, in fact, increasing.
Cisco expands security capabilities of SD­-WAN portfolio
Until now, SD-­WAN solutions have forced IT to choose between application experience or security.
AlgoSec delivers native security management for Azure Firewall
AlgoSec’s new solution will allow a central management capability for Azure Firewall, Microsoft's new cloud-native firewall-as-a-service.
Kiwis losing $24.7mil to scam calls every year
The losses are almost five times higher compared to the same period last year, from reported losses alone.
How to configure your firewall for maximum effectiveness
ManageEngine offers some firewall best practices that can help security admins handle the conundrum of speed vs security.
Exclusive: Why Australian enterprises are prime targets for malware attacks
"Only 14% of Australian organisations are continuously training employees to spot cyber attacks."
Exclusive: Why botnets will swarm IoT devices
“What if these nodes were able to make autonomous decisions with minimal supervision, use their collective intelligence to solve problems?”
"Is this for real?" The reality of fraud against New Zealanders
Is this for real? More often than not these days it can be hard to tell, and it’s okay to be a bit suspicious, especially when it comes to fraud.