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.
Bureau of Public Service Reforms (BPSR) has named the Nigerian Communications Commission (NCC) among the top three Ministries, Departments and Agencies (MDAs) of the Federal Government with the Best Ranking in Website Performance for 2025.
L-R: Head Special Projects, Nigerian Export Promotion Council (NEPC), Salamatu Andu; Executive Commissioner, Technical Services, Nigerian Communication Commission (NCC), Engr. Abaraham Oshadame; Director General Bureau of Public Service Reforms (BPSR), Head Customer Support Service, Galaxy Backbone, Rosemary Ehize; Secretary to the ES. Nigerian Content Development and Monitoring Board, Tahir Aminu at the BPSR award ceremony for top four MDAs in BPSR Website Performance and Ranking 2025 at the BPSR office on Tuesday, 23rd December, 2025.
This is coming barely three weeks after the telecom regulator was recognized as one of the top five best-performing Federal Government agencies for 2025 by the Presidential Enabling Business Environment Council (PEBEC) – a testament to the Commission’s consistency in investment in technology for ensuring efficient service delivery.
In the BPSR 2024/2025 scorecard ranking of agencies’ websites, the NCC came second in the ranking, trailing behind Galaxy Backbone Limited, which came first while the Nigeria Export Promotion Council (NEPC) clinched the third position, from a pool of 235 MDAs, whose website were evaluated.
BPSR deployed 14 evaluation criteria in include MDA’s website compliance with .gov.ng domain name, appearance and aesthetics (look and feel) of the website, content, relevance to MDAs mandate/government policy and the website’ structure.
Others include website’s responsiveness (device compatibility), security, load time, usability/ease of navigation, availability/uptime, functionality, interactivity, accessibility and capacity building.
The recognition was announced at the official release of Federal Government 2024/2025 Scorecard Ranking for MDAs’ Website held at the Federal Ministry of Finance Auditorium in Abuja on Monday (December 22, 2025) while the award presentation took place at BPSR’s Office on Tuesday (December 23, 2025).
The award, which is an important index metric of the National e-Government Masterplan for determining the Nigeria e-Government Status, was received by the Commission in recognition of its commitment to maintaining a world-class website that enhances service delivery to the citizens.
Receiving the award on behalf of the Executive Vice Chairman of the NCC, Dr. Aminu Maida, the NCC’s Executive Commissioner, Technical Services, Abraham Oshadami, appreciated the BPSR for the recognition, describing the award as “another encouragement for the Commission to be a better public service institution leveraging digital platforms such as our web presence to enhance public service delivery to our various stakeholders, thereby implementing the Federal Government’s Ease of Doing Business policy direction.”
While presenting the award to the NCC, alongside other two agencies, BPSR’s Director-General, Mr. Dasuki Arabi, commended the top three for their proactive decisions in maintaining world-class websites, which are compliant with the Federal Government’s policy direction in effective and efficient service delivery to the citizens.
According to the DG, the 2024/2025 MDA’s websites’ ranking represents a collective effort of federal public institutions in Nigeria to be transparent, accountable and open in governance, as well as a confirmation to align with global best practices in service delivery to the citizens.
Developed about six years ago, Arabi said as a result of the annual ranking, more public institutions have indicated readiness to embrace reforms, and align with the policy direction of the current administration’s Renewed Hope agenda on improve governance for effective service delivery, as introduced by His Excellency President Bola Ahmed Tinubu.
“The ideals of harnessing and deploying technological tools for service delivery has become imperative following the COVID pandemic, and distortions of socio-economic system of nations, culminating in the evolution of competitiveness, cost effectiveness, and agile governance.
“As engine room of governance, it behoves on us in the public service to perform our statutory duties and we must put in place technological innovations and standardized websites to operate services as well as deliver service needs to citizens,” he said.
The Scorecard exercise, he said, is part of the BPSR reform broader function of conducting research on reform implementation efforts and presenting ‘best practice’ models to the entire Public Service, and to among others, improve access to government information, facilitate seamless financial transaction, eliminate corruption and cyber theft, as well as facilitate access to government services.
Speaking on the rigorous nature of the exercise that produced the top three winners, the DG said “in the past few weeks members of the Scorecard Jury drawn from inter-Ministerial Agencies, had worked tirelessly to mill websites of selected MDAs through a rigorous process of enduring criteria for the ranking and the outcome had also passed through a quality assurance mechanism to validate the outcome.”
Taiwo Oyedele, Chairman of the Presidential Committee on Fiscal Policy and Tax Reforms, has dismissed reports that bank accounts not linked to a Tax Identification Number (TIN) will be frozen or automatically debited from January 1, 2026.
Taiwo Oyedele
Oyedele described the claims as false and misleading, warning Nigerians against panic over misinformation surrounding recent tax and financial reforms.
In a post on his X handle Tuesday morning, he wrote: “Don’t let anyone manipulate you. Your bank account is safe. Misinformation makes you panic and fear a reform that is designed to help you.
“When they tell you that your account will be frozen or automatically debited from January 2026, ask them for the evidence in the new law. Be wise.”
He stressed that no provision in the new tax laws authorises the freezing of bank accounts, adding that the rumours are part of widespread misrepresentation of the reforms.
The committee chairman reiterated that the reforms are intended to simplify Nigeria’s tax system and ease the burden on ordinary citizens, not to impose punitive measures on bank customers.
US tech giant, Amazon has disclosed that it blocked more than 1,800 North Koreans from applying for jobs, amid growing concerns that Pyongyang is deploying large numbers of IT workers overseas to earn and launder funds.
Amazon
In a LinkedIn post, Amazon’s Chief Security Officer, Stephen Schmidt, said North Korean nationals have been attempting to secure remote IT roles with companies around the world, particularly in the United States.
He noted that the company recorded nearly a one-third increase in such applications over the past year.
According to Schmidt, many of the applicants operate through so-called “laptop farms” — computers physically located in the US but remotely controlled from abroad.
He warned that the issue is not unique to Amazon and is likely occurring at scale across the tech industry.
He added that common red flags include incorrectly formatted phone numbers and questionable academic credentials.
The issue has previously drawn the attention of US authorities. In July, a woman in Arizona was sentenced to more than eight years in prison for running a laptop farm that helped North Korean IT workers obtain remote jobs at more than 300 US companies.
Officials said the scheme generated over $17 million in revenue for both the woman and North Korea.
Last year, South Korea’s intelligence agency also warned that North Korean operatives were using LinkedIn to pose as recruiters, approaching South Koreans working at defence companies in an attempt to steal sensitive technological information.
“North Korea is actively training cyber personnel and infiltrating key locations worldwide,” Hong Min, an analyst at the Korea Institute for National Unification, told AFP.
He added that, given Amazon’s business model, the motivation behind such operations is largely economic, with a high likelihood of attempts to steal financial assets.
North Korea’s cyber warfare programme dates back to at least the mid-1990s and has since expanded into a cyber unit of about 6,000 personnel known as Bureau 121, according to a 2020 US military report.
In November, Washington announced sanctions against eight individuals accused of being state-sponsored hackers, alleging their illicit activities were carried out to fund North Korea’s nuclear weapons programme.
The US Treasury has also accused North Korea-linked cybercriminals of stealing more than $3 billion over the past three years, primarily through cryptocurrency-related crimes.
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