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.
Irvine Partners, the woman-led, African-born creative communications agency operating across Nigeria, has cemented its position as a disruptive force on the global stage following a landmark week of international industry recognition for its CEO and founder, Rachel Irvine.
Rachel-Irvine-CEO-Irvine-Partners
Irvine has been named to Campaign UK’s prestigious 40 over 40 list for 2026, while simultaneously earning a place on PRovoke Media’s Innovator 25 EMEA index – two of the communications industry’s most closely watched honours, secured in the same week. The achievement places her among the most influential and progressive communications leaders across Europe, the Middle East, and Africa.
For Nigeria – Africa’s largest economy and one of its most competitive and complex communications environments – the recognition speaks directly to something the local industry has long understood: that the strategic thinking, cultural intelligence and executional precision forged in African markets is not a regional advantage. It is a global one.
Irvine Partners brings this philosophy to some of the world’s most prominent digital and consumer brands in the Nigerian market, including TikTok, Spotify, Uber and Google – organisations that demand communications work of the highest international calibre, delivered with genuine local understanding.
An African agency rewriting the global narrative
Campaign UK’s 40 over 40 celebrates individual excellence, leadership and lasting impact within the British media and marketing landscape. PRovoke Media’s Innovator 25 spotlights those who are dismantling traditional PR structures, advancing data-led practice, and reshaping how the industry operates. To earn both in a single week is rare by any measure.
What underpins both honours is a story that begins not in London but in Africa – in the dynamic, high-stakes communications environments of markets like Nigeria, where agencies must be sharper, faster and more culturally precise than anywhere else in the world.
“These accolades are less about my own journey and far more about where Irvine Partners is going as a collective,” says Rachel Irvine. “For a long time, the global communications industry treated African agencies as local executors of global strategies. What we’ve proven over the past few years is that the technical craft, cultural capital, and data frameworks built within our agency are not just scalable for the continent; they are world-class.”
Built on the same ethos that works in Lagos
The recognition follows the agency’s strong performance at the IN2 SABRE Awards EMEA, where Irvine Partners took major wins for Unicorn School – its proprietary internal talent development programme – and for its advanced data analytics capability, alongside notable shortlists for global clients including Spotify and Uber.
Nigeria’s communications market is one of the most demanding in the world. Consumer audiences are sophisticated and discerning. The media environment is layered, fast-moving and deeply attuned to authenticity. Brands that succeed here do not do so through generic messaging – they do so through precision, cultural credibility and strategic consistency. These are precisely the competencies that Irvine Partners has built its international reputation on.
“The PR landscape has fundamentally shifted,” Irvine adds. “Clients no longer want siloed regional strategies; they want intelligent, culturally intuitive storytelling backed by bulletproof analytics that move the business needle. We built our foundations on that exact ethos in highly dynamic markets, and bringing that specific DNA to the UK and EMEA regions is why we are winning.”
The agency’s agile, borderless model – deliberately structured to move at the speed of modern brands rather than the pace of legacy networks- is one that Nigerian communications professionals will recognise as a natural evolution of how the best African agencies have always operated: lean, sharp and built for impact.
Underlying both honours is Irvine’s sustained commitment to talent development and cultural diversity across all of the agency’s wholly owned offices – a principle as central to its Lagos work as to any other market in its growing global footprint.
Mark Zuckerberg, Meta Chief Executive Officer, has announced a major leadership change at WhatsApp, confirming that Will Cathcart will step down as head of the messaging service after seven years in office.
Zuckerberg made the announcement in a post shared on Facebook on Monday, June 22, 2026, praising Cathcart’s contributions to the growth of the platform.
According to him, Cathcart played a key role in expanding WhatsApp’s global user base to over three billion people while promoting privacy-focused communication across its services.
“Will’s been one of Meta’s most important and effective leaders, helping to bring WhatsApp to over 3 billion people and championing privacy for our community,” Zuckerberg stated.
The Meta CEO also announced that Kunal Shal will take over leadership of WhatsApp.
He described Shal as a “builder” with strong international experience, adding that his leadership style aligns with Meta’s long-term vision for the messaging platform.
Meta said the transition is aimed at strengthening WhatsApp’s role in both personal and business communication globally, as the platform continues to expand its services across markets.
Industry observers say the leadership change marks a significant transition for WhatsApp, which has grown rapidly under Cathcart’s stewardship, particularly in areas of privacy, encryption, and enterprise messaging solutions.
However, Meta has not disclosed the exact timeline for the leadership handover or further structural changes within the messaging division.
The company reaffirmed its commitment to maintaining WhatsApp’s security standards and continued innovation under the new leadership.
MTN Nigeria has raised the bar for corporate disclosure in Africa after publishing its 2025 sustainability report in full compliance with International Financial Reporting Standards S1 and S2.
Dr. Karl Toriola, CEO of MTN Nigeria,
The report, independently assured by Ernst & Young, marks the telecom operator’s seventh consecutive annual sustainability publication and third year as an early adopter of the global framework ahead of its mandatory implementation.
Dr. Karl Toriola, CEO of MTN Nigeria, said, “strong governance and ethical conduct are foundational to our sustainability strategy. We reinforced compliance through our Conduct Passport Framework and robust internal controls.”
He added that “in May 2025, we became the first telecommunications company in Nigeria to publicly present a sustainability report on the Nigerian Exchange Group platform, an important milestone in our commitment to IFRS S1 and S2- aligned disclosure and accountability.”
The company also secured Carbon Disclosure Project ratings of ‘B-’ for climate change and ‘C’ for water security.
Under the IFRS S2 framework, the telecoms operator disclosed climate-related risks linked to flooding, heat stress, regulatory changes and possible future taxes or charges on carbon emissions, following a climate scenario analysis completed in 2024.
The report also showed that MTN Nigeria now uses a digital reporting format – XBRL. This makes its sustainability and governance data easier for investors and ESG rating agencies to access and analyse through automated systems.
The Company also carried out assessments to understand how sustainability issues affect both its business operations and society at large, while measuring its overall economic, environmental and social impact from 2021 to 2024.
In addition, over one-third of MTN Nigeria’s biggest suppliers (based on spending) have committed to supporting the company’s net-zero emissions goals, although these commitments have not yet gone through an independent audit or verification process.
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