Cyber Briefing: 2026.04.24
The latest cyber threat landscape is marked by sophisticated session-stealing attacks targeting Telegram desktop users via PowerShell scripts and fraudulent CAPTCHA pages used...
Welcome to Cyber Briefing, your daily source for all things cybersecurity. We bring you the latest advisories, alerts, incidents, and news every weekday.
The latest cyber threat landscape is marked by sophisticated session-stealing attacks targeting Telegram desktop users via PowerShell scripts and fraudulent CAPTCHA pages used to facilitate international SMS fraud.
High-profile incidents include a data breach at UK Biobank involving the sale of de-identified research data and the rise of large-scale Chinese botnets using compromised edge devices for espionage. Amidst these threats, French authorities successfully arrested the notorious hacker “HexDex,” while the broader tech industry faces internal shifts as Meta and Microsoft implement thousands of job cuts to pivot their resources toward artificial intelligence.
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⚡THREAT LANDSCAPE
Hackers Exploit PowerShell Script for Telegram Hijack
Hackers have developed a new session-stealing tool targeting Telegram’s desktop client by using a PowerShell script hosted on Pastebin. This script masquerades as a Windows telemetry update and does not aim to steal passwords or browser credentials, focusing solely on Telegram session data. Users of Telegram’s desktop client should be cautious of unexpected updates and verify the source of any scripts before execution. Read More.
Fake CAPTCHA Scam Triggers SMS Fraud
Cybercriminals are exploiting fake CAPTCHA pages to conduct an international SMS fraud scheme, deceiving users into unwittingly participating in international revenue share fraud. Victims are directed to these fraudulent CAPTCHA pages through lookalike and scam domains, which are part of a traffic distribution system. To protect themselves, users should be cautious of unfamiliar CAPTCHA requests and verify the legitimacy of websites before entering any information. Read More
🚨INCIDENTS & REAL-WORLD IMPACT
UK Biobank Data Breach Raises Concerns
The UK Biobank, a major biomedical research resource, experienced a data breach where de-identified participant data was listed for sale on a Chinese website. Although the data did not include personal identifiers like names or addresses, the breach violated data access agreements with academic institutions. In response, UK Biobank has suspended access to its research platform and is implementing stricter security measures to prevent future incidents. Read More
🔓 EXECUTIVE RISK & CYBERNOMICS
Chinese Cyber Espionage via Compromised Devices
China-linked cyber threat actors are now using large-scale covert networks and botnets made from compromised routers and edge devices, according to the National Cyber Security Centre (NCSC). This shift from individually procured infrastructure poses a threat to organizations of all sizes, particularly through VPN and remote access connections. Organizations are advised to map and baseline traffic from these devices to mitigate the risk. Read More
🛡️ POLICY, REGULATION & LEGAL SIGNALS
French Police Arrest HexDex Hacker
French police have arrested a 20-year-old hacker known as HexDex, suspected of stealing data from numerous organizations, including sports federations and government offices, and posting it online. The investigation began in December 2025 after nearly 100 reports of data theft, and the suspect was apprehended just before leaking more data. Affected parties should review their security measures and monitor for any unauthorized data access or leaks. Read More
💻 CAREER ENABLEMENT
Job Cuts at Meta and Microsoft
Meta and Microsoft have announced significant job cuts as they shift focus towards artificial intelligence investments. Meta plans to cut around 8,000 jobs and leave 6,000 positions unfilled, while Microsoft is offering voluntary redundancies to about 8,750 employees. Affected employees should prepare for potential job transitions and stay informed about upcoming company updates. Read More
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