Telecom
Sophos CryptoGuard Technology Reveals How Attackers Increased Their Use of Remote Ransomware by 62% Annually
Sophos, a global leader in innovating and delivering cybersecurity as a service, has released a report, titled “CryptoGuard: An Asymmetric Approach to the Ransomware Battle,” which found that some of the most prolific and active ransomware groups, including Akira, ALPHV/BlackCat, LockBit, Royal, Black Basta, are deliberately switching on remote encryption for their attacks.
In remote encryption attacks, also known as remote ransomware, adversaries leverage a compromised and often underprotected endpoint to encrypt data on other devices connected to the same network.
Sophos CryptoGuard is the anti-ransomware technology that Sophos acquired in 2015* and is included in all Sophos Endpoint licenses. CryptoGuard monitors the malicious encryption of files and provides immediate protection and rollback capabilities, including when the ransomware itself never appears on a protected host.
The unique anti-ransomware technology is a last line of defense in Sophos’ layered endpoint protection, only activating if an adversary triggers it later in the attack chain.
CryptoGuard detected a 62% year-over-year increase in intentional remote encryption attacks since 2022.
“Companies can have thousands of computers connected to their network, and with remote ransomware, all it takes is one underprotected device to compromise the entire network. Attackers know this, so they hunt for that one ‘weak spot’—and most companies have at least one. Remote encryption is going to stay a perennial problem for defenders, and based, on the alerts we’ve seen, the attack method is steadily increasing,” said Mark Loman, vice president, threat research at Sophos, and the co-creator of CryptoGuard.
Since this type of attack involves encrypting files remotely, traditional anti-ransomware protection methods deployed on remote devices don’t “see” the malicious files or their activity, failing to protect them from unauthorized encryption and potential data loss. Sophos CryptoGuard technology, however, takes an innovative approach to stopping remote ransomware, as explained in the Sophos X-Ops article: analyzing the contents of files to see if any data became encrypted to detect ransomware activity on any device in a network, even if there is no malware on the device.
In 2013, CryptoLocker was the first prolific ransomware to utilize remote encryption with asymmetric encryption, also known as public-key cryptography. Since then, adversaries have been able to escalate the use of ransomware, due to ubiquitous, ongoing security gaps at organizations worldwide and the advent of cryptocurrency.
“When we first noticed CryptoLocker taking advantage of remote encryption ten years ago, we foresaw that this tactic was going to become a challenge for defenders. Other solutions focus on detecting malicious binaries or execution. In the case of remote encryption, the malware and execution reside on a different computer (unprotected) than the one having the files encrypted. The only way to stop it is watching the files and protecting them. That’s why we innovated CryptoGuard,” said Loman.
“CryptoGuard does not hunt for ransomware; instead, it zeroes in on the primary targets—the files. It applies mathematical scrutiny to documents, detecting signs of manipulation and encryption. Notably, this autonomous strategy deliberately does not depend on indicators of breach, threat signatures, artificial intelligence, cloud lookups, or prior knowledge to be effective. By focusing on the files, we can change the power balance between the attackers and the defenders. We’re increasing the cost and complexity for the attackers to successfully encrypt data, so that they will abandon their objectives. This is a part of our asymmetric defense approach strategy.
“Remote ransomware is a prominent problem for organizations, and it is contributing to the longevity of ransomware in general. Given that reading data over a network connection is slower than from a local disk, we have seen attackers, like LockBit and Akira, strategically encrypt only a fraction of each file. This approach aims to maximize impact in minimal time, further reducing the window for defenders to notice the attack and respond. Sophos’ approach to anti-ransomware technology stops both remote attacks and those that encrypt just 3% of a file. We’re hoping to inform defenders about this persistent attack method, so they can properly protect devices.”
For more information, read “CryptoGuard: An Asymmetric Approach to the Ransomware Battle” on Sophos.com.
MTN Nigeria’s commitment to digital innovation took center stage at MarkHack 4.0, the annual marketing and technology conference held at Landmark Event Centre, Victoria Island, Lagos, on Friday, May 23, 2025, with the theme ‘Experience Ignited: Fueling the Customer’s Journey’.
L-R: Akinbulejo Onabolu, Head, Enterprise Segment, MTN Nigeria; Eneyi Obi, Global Chief Marketing Officer, Rise; Tobi Olanisimi, Marketing Manager, AB InBev; Martha Kayode, Marketing Head, PZ Cussonz; Sulaiman Shaibu, CEO, BFT Consulting Service and Daniel Adeyemi, Managing Editor, Condia Business at the MarkHack 4.0 Conference held at the Landmark Event Centre, Victoria Island, Lagos on Friday, May 23, 2025.
In a celebration of innovation, technology, and storytelling, the company also took home the award for Best Use of Data in a Marketing Campaign at the Nigeria MarTech (MarkHack 4.0) Awards Night. This award recognizes brands that have successfully transformed data into compelling narratives and actionable insights to meaningfully engage their audiences.
Akinbulejo Onabolu, Senior Manager, Segment Management, Enterprise Business at MTN, joined a panel to discuss the power of immersive technologies on consumer behaviour. Drawing from MTN’s launch of its 5G Digital Experience Centre in Abuja last year, Onabolu highlighted the rapid evolution of immersive technologies such as Virtual Reality (VR) and Augmented Reality (AR) stating “Our 5G centre is a sandbox for our customers to come and see how technology can shape things. At the launch event, we unveiled a smart city to customers, clients and dignitaries in attendance, with gaming and other tech experiences.”
On the intersection of data, AR and VR, he added: “Co-creating with MTN takes our minds to a platform where different partners, companies and creators can bring their buildings, products and businesses for people to see via augmented reality and connectivity, just swiping through and following through that journey.
“As a part of impacting our customer’s lives, a few years ago, we also played around with the Metaverse and we ended up creating some of our back-office processes with some of our customer journeys on augmented reality and virtual reality such that a customer somewhere can engage with a virtual agent to solve real life problems and integrating that back into our operating systems. As an organization, at a lot of our events, you will find a lot of AR and VR experiences.”
Speaking on how MTN is embedding immersive technology into its day-to-day operations, he explained that the company is prioritizing both internal capability development and external engagement. “85% of our organization has undergone extensive training on AI and that already is a great addition to our daily lives. We’re using it to do things differently, developing user journeys and brainstorming different things. In terms of Augmented Reality and Virtual Reality, we are working with organizations to develop training programs which we use internally.”
He described the bases for this tech as stable connectivity, high bandwidth, high speed and low latency. “Over the past year, we’ve doubled our 5G capacity across the entire country. Wherever you are, you’ll probably start to pick up 5G. With our FibreX service, we’re going way beyond connectivity to create the systems and platforms to support the ecosystem, AR and VR. In addition to this, we’re also engaging regulatory systems to start to tease this out and build the proper governance.”
The session, moderated by Daniel Adeyemi, Managing Editor at Condia Business, also featured insights from leaders in FMCG, consulting, and global marketing, all underscoring the transformative potential of immersive technologies for Africa’s future.
MTN Nigeria has announced a massive capital expenditure (CAPEX) drive for 2025, nearly doubling its investment to almost 900 billion Naira, as it seeks to significantly enhance network service quality in major cities like Lagos and Abuja and extend improvements to other areas.
Karl Toriola
This financial commitment, up from a combined total of approximately 440 billion Naira spent in 2023 and 2024, was detailed by MTN Nigeria CEO, Dr. Karl Toriola, during a recent interview on Arise TV.
Toriola highlighted that a key focus of the increased CAPEX will be on “putting additional capacity in a city like Lagos, particularly in Abuja, where you have a lot of buildings coming up, you need additional sites because there are coverage issues.”
Beyond these critical urban centres, the investment aims to bolster network resilience and ensure power stability for its infrastructure nationwide. This includes proactively addressing site outages by ensuring timely payment for operational necessities such as diesel for generators, a persistent challenge in the Nigerian operating environment
The CEO outlined the comprehensive nature of the upgrade process, which involves “placing orders formally, opening letters of credit, and then the equipment gets shipped in and installed.” He added that where necessary, MTN will be “acquiring new sites” and “laying fiber to the base station to create better stability.”
While the immediate CAPEX is geared towards improving existing service quality and capacity, this investment aligns with MTN’s broader goals, which include enhancing financial inclusion in underserved rural areas, suggesting a long-term vision for network expansion and service improvement that extends beyond metropolitan areas.
Customers are expected to begin experiencing the positive impact of these investments with a “significant improvement in quality of service” anticipated by the end of the second quarter or early in the third quarter of 2025, according to Toriola.
Airtel Nigeria, telecom service provider, has announced that its AI-powered Spam Alert Service issued over 9.6 million spam alerts between March 13 and May 20, 2025.
As part of its ongoing commitment to protecting customers from unwanted and potentially fraudulent communications, Airtel designed the AI Spam Alert service to analyze traffic patterns and detect anomalies.
In the period since launch the AI pinpointed a total of 9,667,008 SMS as potential spam messages in the two months after its launch.
Of these, the system identified 528,080 on-net (Airtel-to-Airtel) and 9,138,928 off-net (from other networks) numbers as suspected spam messages, demonstrating the scale of the threat and Airtel’s advanced processing capability.
Airtel Nigeria is a subsidiary of Airtel Africa.
Commenting on this development, Dinesh Balsingh, CEO, Airtel Nigeria, restated Airtel`s commitment to protecting its customers.
“This milestone demonstrates the strength of our AI-driven infrastructure in combating the growing menace of spam and scam calls. At Airtel Nigeria, we are focused on connecting Nigerians and ensuring their safety and confidence while using our network.
“We understand that trust is the cornerstone of digital communication. That’s why we’ve invested heavily in intelligent systems that not only detect potential threats but also learn and evolve with data. As threats become more sophisticated, so will our solutions. As a company, we remain focused on leading the industry in innovation and customer satisfaction, ensuring that every Nigerian can enjoy a safer and smarter digital experience,” Mr. Balsingh said.
The Spam Alert Service is part of Airtel Nigeria’s broader strategy to integrate artificial intelligence into its core offerings to deliver smarter and safer experiences for its customers across the country.
Recall that the Spam Alert Service was launched on March 13, 2025. A groundbreaking and free solution from Airtel, it notifies users in real-time of suspected spam SMS messages by analyzing over 250 parameters.
The Airtel AI Spam Alert Service is available to all Airtel subscribers on smartphones and feature phones.
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