Zacinlo malware threatens Windows 10 PCs' security

Malware takes screenshots of users' desktops, and has been operating silently for six years

Malware

Researchers have uncovered a sophisticated rootkit-based adware, mainly prevalent on Windows 10 devices, that has been operating covertly for six years.

Dubbed Zacinlo, this rare strain of malware typically operates by silently rendering webpages in the background in hidden windows to simulate clicks and keyboard interactions, or can replace ads naturally loaded in an open web browser with its own ads to collect revenue.

Advertisement - Article continues below

The malware, subject to an extensive investigation by security company Bitdefender, is armed with a sophisticated array of features to ensure it remains undetected, and even quashes any 'competition', featuring an adware cleanup routine to remove any potential rivals in the adware space.

It can also uninstall or delete services based on instructions it receives from the command and control infrastructure, to which it routinely sends information about its environment, including what form of anti-malware services may be installed, and which applications are running on startup.

One of its most concerning features involves a significant invasion of privacy, with Zacinlo able to take screen captures of a user's desktop and send them to its command and control centre for analysis.

Bitdefender's security researchers were alerted to the rootkit-based adware last year, publishing the results of its analysis in a whitepaper.

Advertisement
Advertisement - Article continues below

"Since rootkits these days account for under 1% of the malware output we see worldwide, this immediately drew our attention and prompted us to carry out an extensive analysis of the payload, its origins and the spread," the report said.

Advertisement - Article continues below

"We discovered an ample operation whose central component is a very sophisticated piece of adware with multiple functionalities."

Over the course of its investigation, Bitdefender learned the adware had been running covertly since 2012/13 with at least 25 different components in almost 2,500 distinct samples. Although components date back to 2012, the adware was most active towards the end of 2017.

The researchers also learned the functionality of many of Zacinlo's components were in a state of flux throughout the time it was being tracked; with functionalities updated, dropped, or integrated with other components, indicating it is still being developed.

The vast majority of the samples tracked were spotted in the US, with a handful found in France, Germany, Brazil, China, Indonesia, the Philippines, and several infections in the UK. 

Significantly, despite Windows 10 being fitted with in-built technology to protect users from rootkits, the overwhelming majority of samples, 90%, were found on devices running Microsoft's latest operating system.

Advertisement - Article continues below

"While generating untold revenue for the companies that run these programs, adware has witnessed constant improvements over the years in both data collection and resilience to removal," said Bitdefender senior e-threat analyst Bogdan Botenzatu.

"The line between adware and spyware has become increasingly fuzzy during recent years as modern adware combines aggressive opt-outs with confusing legal and marketing terms as well as extremely sophisticated persistence mechanisms aimed at taking control away from the user."

Asked where it fits into the wider threat landscape of 2018, Botenzatu told IT Pro: "Zacinlo was an unexpected surprise in the wider cyber-security landscape, which is currently dominated by ransomware and crypto-jacking malware.

"The discovery of rootkit-based malware that mostly affects Windows 10 is enough evidence that "independent" malware operators find lucrative niches in a threat landscape dominated by crypto-ransomware and illegal mining of digital currency."

Zacinlo is the latest in a number of sophisticated malware strains that researchers have uncovered in recent months. Bitdefender similarly detected a remote access tool, named RadRAT, previously operating undetected since 2015, which offers attackers full control over seized computers.

Advertisement - Article continues below

Roaming Mantis, meanwhile, which uses DNS-hijacking to redirect users to phishing sites running a Coin Hive cryptomining script, was found by Kaspersky Lab last month to be on spreading rapidly across the globe after emerging only a couple of months previously in a handful of countries including Japan and India.

Featured Resources

Preparing for long-term remote working after COVID-19

Learn how to safely and securely enable your remote workforce

Download now

Cloud vs on-premise storage: What’s right for you?

Key considerations driving document storage decisions for businesses

Download now

Staying ahead of the game in the world of data

Create successful marketing campaigns by understanding your customers better

Download now

Transforming productivity

Solutions that facilitate work at full speed

Download now
Advertisement
Advertisement

Recommended

Visit/mobile/google-android/356373/over-2-dozen-additional-android-apps-found-stealing-user-data
Google Android

Over two dozen Android apps found stealing user data

7 Jul 2020
Visit/security/ransomware/356292/university-of-california-gets-fleeced-by-hackers-for-114-million
ransomware

University of California gets fleeced by hackers for $1.14 million

30 Jun 2020
Visit/security/cyber-security/356289/australia-announces-135b-investment-in-cybersecurity
cyber security

Australia announces $1.35 billion investment in cyber security

30 Jun 2020
Visit/cloud/cloud-security/356288/csa-and-issa-form-cybersecurity-partnership
cloud security

CSA and ISSA form cyber security partnership

30 Jun 2020

Most Popular

Visit/business/business-operations/356395/nvidia-overtakes-intel-as-most-valuable-us-chipmaker
Business operations

Nvidia overtakes Intel as most valuable US chipmaker

9 Jul 2020
Visit/laptops/29190/how-to-find-ram-speed-size-and-type
Laptops

How to find RAM speed, size and type

24 Jun 2020
Visit/server-storage/servers/356083/the-best-server-solution-for-your-smb
Sponsored

The best server solution for your SMB

26 Jun 2020