Featured Cyber Threat: Ransomware

This week, the spotlight is on “Prey,” a new strain of ransomware from the infamous MedusaLocker family. It zeroes in on Windows systems, particularly those in enterprise environments, to lock up user data in a vice grip of encryption. Using RSA and AES algorithms, it adds a “.prey35” extension to files, making them inaccessible without the decryption key—likely in the hands of the attackers.

Prey changes desktop backgrounds, leaves behind an HTML ransom note, and nixes any chance of easy data recovery by wiping system restore points. Victims are warned that attempts to bypass their instructions with other decryption tools might backfire. The clock is ticking, with ransom demands hike after 72 hours and the threat of stolen data exposure looming.

Current Malware Trend: Maverick Trojan

Brazil faces a major threat from the “Maverick” Trojan, a banking malware wreaking havoc through WhatsApp. Disguised within ZIP files, this Trojan slips past defenses to commandeer WhatsApp accounts, turning the victim’s device against them.

Maverick’s play is to check if it’s in Brazil, then it steals banking info by recording keystrokes, capturing screen activity, and overlaying fake screens during financial transactions. It’s cunning and targets over two dozen banks and cryptocurrency platforms.

To counter these threats, businesses need to bolster security protocols, educate teams, and maintain reliable, untouchable backups.

Noteworthy Data Breaches

In Japan, companies are reeling from ransomware attacks by WorldLeaks and Rhysida. Mandom Corporation and FURUNO Electric Co., Ltd. are the latest victims, facing hefty data theft and ransom demands.

Mandom saw 622.2 GB of data whisked away, while FURUNO is staring down a 15 Bitcoin demand. These breaches underscore the dire need for vigilant defenses against a backdrop of increasingly savvy cyber assailants.

Key Takeaways

Stay sharp against ransomware by integrating comprehensive security measures and fostering keen awareness within your teams. As attackers up the ante with sophisticated tactics, your best defense includes cutting-edge detection and a culture steeped in cybersecurity vigilance.

For the latest updates and tailored cyber threat analysis, explore the DeCYFIR platform’s expansive resources.

Copyright CYFIRMA 2025. All rights reserved.

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