A week in security (March 3 – March 9)

Last week on Malwarebytes Labs: TikTok: Major investigation launched into platform’s use of children’s data PayPal scam abuses Docusign API to spread phishy emails Android zero-day vulnerabilities actively abused. Update as soon as you can I spoke to a task scammer. Here’s how it went Android...

Cybercriminals Allegedly Used a StubHub Backdoor to Steal Taylor Swift Tickets

Plus: The world’s “largest illicit online marketplace” gets hit by regulators, police seize the Garantex crypto exchange, and scammers trick targets by making up ransomware attacks...

FIN7, FIN8, and Others Use Ragnar Loader for Persistent Access and Ransomware Operations

Threat hunters have shed light on a "sophisticated and evolving malware toolkit" called Ragnar Loader that's used by various cybercrime and ransomware groups like Ragnar Locker aka Monstrous Mantis, FIN7, FIN8, and Ruthless Mantis ex-REvil. "Ragnar Loader plays a key role in keeping access to...

Tata Technologies Hit by Hunters International Ransomware, 1.4TB Data at Risk

Tata Technologies hit by Hunters International ransomware attack. The group threatened to leak 1.4TB of data. Learn about…...

Ransomware threat mailed in letters to business owners

Business owners and CEOs across the United States received customized ransomware threats this month from the most unusual of places—letters in the mail. The letters, which were first reported by multiple cybersecurity researchers, claim to come from a ransomware group called BianLian. But since...

EncryptHub Deploys Ransomware and Stealer via Trojanized Apps, PPI Services, and Phishing

The financially motivated threat actor known as EncryptHub has been observed orchestrating sophisticated phishing campaigns to deploy information stealers and ransomware, while also working on a new product called EncryptRAT. "EncryptHub has been observed targeting users of popular applications, ...

Medusa Ransomware Hits 40+ Victims in 2025, Demands $100K–$15M Ransom

The threat actors behind the Medusa ransomware have claimed nearly 400 victims since it first emerged in January 2023, with the financially motivated attacks witnessing a 42% increase between 2023 and 2024. In the first two months of 2025 alone, the group has claimed over 40 attacks, according to...

Jasmin Ransomware SQL Injection / Authenticaton Bypass Vulnerability

Exploit Title: Jasmin Ransomware SQL Injection Login Bypass Exploit Author: Buğra Enis Dönmez n3c1 Vendor Homepage: https://github.com/codesiddhant/Jasmin-Ransomware Software Link: https://github.com/codesiddhant/Jasmin-Ransomware Version: N/A Tested on: Windows How to exploit : -- Open Admin Pan...

Jasmin Ransomware SQL Injection / Authenticaton Bypass

Jasmin Ransomware suffers from a remote SQL injection vulnerability that allows for authentication bypass. Exploit Title: Jasmin Ransomware SQL Injection Login Bypass Google Dork: N/A Date: 05-03-2025 Exploit Author: Buğra Enis Dönmez n3c1 Vendor Homepage:...

Scammers Mailing Ransom Letters While Posing as BianLian Ransomware

Scammers are impersonating BianLian ransomware, and mailing fake ransom letters to businesses. Learn the red flags and how…...

Researchers Link CACTUS Ransomware Tactics to Former Black Basta Affiliates

Threat actors deploying the Black Basta and CACTUS ransomware families have been found to rely on the same BackConnect BC module for maintaining persistent control over infected hosts, a sign that affiliates previously associated with Black Basta may have transitioned to CACTUS. "Once infiltrated...

Fake IT Support Calls Trick Microsoft Teams Users into Installing Ransomware

Cybercriminals pose as IT support, using fake calls and Microsoft Teams messages to trick users into installing ransomware through email floods and remote access...

Hackers Exploit Paragon Partition Manager Driver Vulnerability in Ransomware Attacks

Threat actors have been exploiting a security vulnerability in Paragon Partition Manager's BioNTdrv.sys driver in ransomware attacks to escalate privileges and execute arbitrary code. The zero-day flaw CVE-2025-0289 is part of a set of five vulnerabilities that was discovered by Microsoft,...

Malicious code in ransomware (PyPI)

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MAL-2025-1988 Malicious code in ransomware (PyPI)

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The New Ransomware Groups Shaking Up 2025

In 2024, global ransomware attacks hit 5,414, an 11% increase from 2023. After a slow start, attacks spiked in Q2 and surged in Q4, with 1,827 incidents 33% of the year's total. Law enforcement actions against major groups like LockBit caused fragmentation, leading to more competition and a rise ...

A week in security (February 24 – March 2)

Last week on Malwarebytes Labs: Millions of stalkerware users exposed again PayPal’s "no-code checkout" abused by scammers Countries and companies are fighting at the expense of our data privacy Roblox called "real-life nightmare for children" as Roblox and Discord sued Android happy to check you...

Black Basta and Cactus Ransomware Groups Add BackConnect Malware to Their Arsenal

In this blog entry, we discuss how the Black Basta and Cactus ransomware groups utilized the BackConnect malware to maintain persistent control and exfiltrate sensitive data from compromised machines...

Notorious Malware, Spam Host “Prospero” Moves to Kaspersky Lab

One of the most notorious providers of abuse-friendly "bulletproof" web hosting for cybercriminals has started routing its operations through networks run by the Russian antivirus and security firm Kaspersky Lab , KrebsOnSecurity has learned. Security experts say the Russia-based service provider...

PT-2025-9181

Name of the Vulnerable Software and Affected Versions Paragon Partition Manager version 17 Paragon Partition Manager versions prior to 2.0.0 Description The issue is related to an insecure kernel resource access vulnerability in the BioNTdrv.sys driver, which can be exploited to compromise the...