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News alert: SquareX discloses nasty browser-native ransomware that’s undetectable by antivirus

The Last Watchdog

Mar 28, 2025, CyberNewswire — From WannaCry to the MGM Resorts Hack, ransomware remains one of the most damaging cyberthreats to plague enterprises. Traditionally, the primary target of ransomware has been the victims device. Palo Alto, Calif.,

Antivirus 147
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Arrest, Seizures Tied to Netwalker Ransomware

Krebs on Security

and Bulgarian authorities this week seized the darkweb site used by the NetWalker ransomware cybercrime group to publish data stolen from its victims. The victim shaming site maintained by the NetWalker ransomware group, after being seized by authorities this week. ” Image: Chainalysis.

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Kasseika ransomware uses antivirus driver to kill other antiviruses

Bleeping Computer

A recently uncovered ransomware operation named 'Kasseika' has joined the club of threat actors that employs Bring Your Own Vulnerable Driver (BYOVD) tactics to disable antivirus software before encrypting files. [.]

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Adventures in Contacting the Russian FSB

Krebs on Security

In the process of doing so, I encountered a small snag: The FSB’s website said in order to communicate with them securely, I needed to download and install an encryption and virtual private networking (VPN) appliance that is flagged by at least 20 antivirus products as malware. The FSB headquarters at Lubyanka Square, Moscow.

Antivirus 336
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LockFile Ransomware uses a new intermittent encryption technique

Security Affairs

Recently emerged LockFile ransomware family LockFile leverages a novel technique called intermittent encryption to speed up encryption. LockFile ransomware gang started its operations last month, recently it was spotted targeting Microsoft Exchange servers using the recently disclosed ProxyShell vulnerabilities.

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LockFile ransomware uses intermittent encryption to evade detection

CSO Magazine

A new ransomware threat called LockFile has been victimizing enterprises worldwide since July. Key to its success are a few new tricks that make it harder for anti-ransomware solutions to detect it. Learn how recent ransomware attacks define the malware's new age and 5 reasons why the cost of ransomware attacks is rising. |

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Medusa Ransomware targeted over 40 organizations in 2025

Security Affairs

Medusa ransomware has claimed nearly 400 victims since January 2023, with attacks increasing by 42% between 2023 and 2024. The Symantec Threat Hunter Team reported that the Medusa ransomware operators have claimed nearly 400 victims since January 2023. Experts tracked the Medusa ransomware activity as Spearwing.