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.
Vivo, Chinese smartphone maker has signed a memorandum of understanding (MoU) with Credit Direct, Nigerian consumer finance company to launch a device financing programme in the country.
L-R: Toni Liu, CEO, vivo Nigeria, and Chukwuma Nwanze, MD/CEO, Credit Direct, at the MoU signing in Lagos
This initiative aims to remove barriers to smartphone ownership while supporting Vivo’s expansion strategy in Nigeria.
Under the terms of the agreement, customers can purchase a Vivo smartphone by paying 20% upfront and spreading the remaining balance over six months.
Credit Direct will provide the financing.
Both companies target sales of more than 200,000 devices in the first year.
“People who need smartphones but cannot pay upfront can now do so through a payment plan that does not strain their monthly income. Our mission has always been to make financial solutions a universal opportunity, and this is exactly what this represents in practice. I am truly excited about what we can achieve together,” said Chukwuma Nwanze, chief executive officer of Credit Direct.
This initiative comes as smartphone financing programs gain momentum across Africa, where device affordability remains a key barrier to mobile internet adoption.
According to the GSMA, the median cost of an entry-level smartphone in Nigeria fell from $84 in 2018 to $18 in 2024, reducing its share of average monthly income to 26%.
However, currency depreciation and rising living costs have offset much of this progress.
For the poorest 40% of Nigerians, an entry-level smartphone still represents 56% of monthly income, while it accounts for 73% for the poorest 20%, highlighting persistent affordability constraints among vulnerable households.
Despite these challenges, smartphone ownership reached only 27% in Nigeria in 2024, according to the GSMA, leaving significant room for growth.
Data from StatCounter shows that Vivo held a 1.18% market share at the end of March 2026.
The company remains far behind market leader Tecno with 18.72%, followed by Infinix at 16.28%, Samsung at 15.4%, Apple at 14.15%, and Xiaomi at 8.17%.
Other players such as Oppo, Itel, and Huawei also operate in the market.
Nigeria’s foremost payments and financial inclusion dialogue platform, Payments Forum Nigeria (PAFON 3.0), will hold this Friday, April 24, 2026, at the prestigious Lagos Oriental Hotel, Lekki Road, bringing together regulators, fintech leaders, banks, policymakers, agent networks, cybersecurity experts, innovators, and ecosystem stakeholders to shape the future of digital payments in Nigeria.
Payments Forum Nigeria (PAFON 3.0
With the theme: “Fair Digital Payments as a Catalyst for Deepening Financial Inclusion in Nigeria,” PAFON 3.0 comes at a defining moment for the country’s digital economy as stakeholders seek practical pathways to close the inclusion gap, strengthen trust in payment systems, and accelerate access for underserved populations.
Why PAFON 3.0 is Different
“Unlike routine conferences, PAFON is a solutions-driven forum designed to bridge policy conversations with market realities.
“The event uniquely convenes fintech operators, agent banking networks, cooperatives, payment innovators, cybersecurity professionals, and thought leaders under one roof to tackle real challenges affecting Nigerians at the grassroots”, said Peter Oluka, co-convener of Payments Forum Nigeria.
“From digital trust and cybersecurity to agency banking, embedded finance, stablecoins, eNaira, SME growth, and healthcare financing, PAFON 3.0 is positioned as one of the most strategic gatherings in Nigeria’s payments ecosystem this year”, Oluka added.
High-Profile Keynote Speakers Confirmed
This year’s edition will feature a distinguished lineup of keynote speakers and industry leaders, including Prof. Adewale Peter Obadare, chief visionary officer, Digital Encode, and Dr. Jameelah Sherrief-Ayedu, vice president, FintechNGR & CEO, Credit Registry
Other confirmed speakers include, Dennis Ajalie, managing director, TeamApt Ltd.; Mr. Chika Nwosu, managing director, PalmPay Nigeria; Uche Uzoebo, MD/CEO, Shared Agent Network Expansion Facilities (SANEF Limited): Special Guest of Honour; Chike Onwuegbuchi, Chairman, Nigeria Information Technology Reporters Association of Nigeria (NITRA); Mojeed Abayomi Agboola, national president, Financial Inclusion Agents Multipurpose Cooperative Society (FIAMCS); Ibirogba Oluwagunwa, chairman Lagos Chapter, Association of Mobile Money and Bank Agents in Nigeria (AMMBAN); Sarafadeen Atanda Fasasi, and president, Association of Financial Inclusion Agents of Nigeria (AFIAN).
Fireside Chat on Africa’s Next Innovators
Another standout session will explore the future of digital currencies and regional interoperability: Stablecoins vs. eNaira: Orchestrating a Unified Digital Payment Rail for West Africa
This special fireside chat, hosted in collaboration with Lagos Blockchain Week, promises fresh perspectives on the next phase of Africa’s payment innovation journey.
Chuwuemeka Enoch Mbaebie, Lead convener of LBW will host the session alongside Senator Ihenyen, Lead Partner of Infusion Lawyers and Founding Trustee of the Virtual Asset Service Providers Association (VASPA); Victoria Oluebube Igboanugo, marketing lead, Lagos Blockchain Week; Chidubem Emelumadu, ecosystem lead (Africa), Lisk, and Harrison Obiefule, Nigerian lead for Superteam.
More Activities Lined Up
Attendees will also experience product demo of Myitura Healthcare Financing Solution;
Townhall Meeting on The State of Agency Banking in Nigeria led by AMMBAN; Goodwill messages from leading institutions and industry associations, and strategic networking with decision-makers across banking, fintech, regulation, media, and innovation ecosystems
PAFON 3.0 is expected to attract C-suite executives, startup founders, regulators, investors, digital payment operators, development institutions, policymakers, and professionals seeking to understand where Nigeria’s payment future is heading.
Participation
Participation is free.
The application deadline for the fifth edition of the MTN Media Innovation Programme (MIP) has been extended to April 25, 2026, organisers have announced.
MTN Nigeria Media Innovation Programme
The extension offers additional time for qualified media professionals and digital content creators across Nigeria to apply for the fully funded programme aimed at advancing storytelling and media innovation.
The initiative is sponsored by MTN Nigeria in partnership with the School of Media and Communication, Pan-Atlantic University (PAU).
Organisers said the 2026 cohort would admit 25 fellows, an increase from the previous 20, in line with MTN Nigeria’s 25th anniversary and its continued commitment to strengthening the country’s media ecosystem.
Launched in 2022, the six-month certificate programme provides participants with training in media innovation, leadership and digital transformation.
It features academic sessions at PAU, industry engagements and an international study visit, including sessions at the University of Johannesburg.
According to the organisers, the programme has produced a growing network of alumni contributing to Nigeria’s media landscape through leadership roles, new media ventures and impactful storytelling.
The programme is open to practitioners across print, broadcast, digital and social media, with applicants expected to demonstrate a strong commitment to innovation and professional development.
Interested applicants can submit their entries through the School of Media and Communication website.
Shortlisted candidates will undergo a rigorous selection process, with successful applicants expected to commence the programme in May 2026.
Nigeria CommunicationsWeek reports that the initiative is part of broader efforts to equip media professionals with the skills needed to adapt to the evolving digital economy.
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