Authors:
Alexander Ivanyuk — Senior Director, Technology
Irina Artioli — Cyber Protection Evangelist, TRU Researcher
The Acronis Cyberthreats Update covers current cyberthreat activity and trends, as observed by Acronis Threat Research Unit (TRU) and sensors. Figures presented here were gathered in April of this year and reflect threats that we detected as well as news stories from the public domain. This report represents a global outlook and is based on more than one million unique endpoints distributed around the world.
Incidents of the month
SK Telecom, South Korea’s largest mobile carrier, is offering free SIM card replacements to its 25 million customers after discovering a USIM data breach. However, only 6 million replacement cards are available through May.
The breach, detected on April 19, involved malware on the company’s network that allowed attackers to steal sensitive SIM data such as IMSI, MSISDN, authentication keys and potentially SMS or contact information stored on the card.
The primary concern is SIM swapping — where attackers use stolen data to clone SIMs and hijack phone numbers.
Only customers who were subscribed as of April 18, 2025 (midnight, Japan time) are eligible for replacement.
April malware detections
In April, Acronis Cyber Protect blocked almost 600,000 malware threats on endpoints — a 36% decrease from March.
The below tables show the percentage of Acronis clients that had at least one malware threat blocked at the endpoint, as well as the normalized percentage of clients with at least one malware detection. The higher the percentage, the higher the risk of a workload in that country being attacked by malware.
Protection
The aforementioned threats can be detected and mitigated with solutions from Acronis.
Acronis Cyber Protect Cloud protects against both known and never-before-seen threats through a multilayered protection approach. This includes behavior-based detection, AI- and ML-trained detections and anti-ransomware heuristics, which can detect and block encryption attempts and roll back any tampered files automatically without any user interaction.
Additional advanced email security and URL filtering can help you protect against social engineering threats. And your Acronis #CyberFit Score helps you quickly identify systems that need attention, while the integrated patch management makes updating your software to the latest versions simple.
Acronis Extended Detection and Response (XDR) for Acronis Cyber Protect Cloud brings the visibility needed to understand attacks while simplifying the context for administrators and enabling efficient remediation of any threats.
