Intermittent File Encryption in Ransomware: Measurement, Modeling, and Detection

File encrypting ransomware increasingly employs intermittent encryption techniques, encrypting only parts of files to evade classical detection methods. These strategies, exemplified by ransomware families like BlackCat, complicate file structure based detection techniques due to diverse file...

Data Encryption Battlefield: a Deep Dive into the Dynamic Confrontations in Ransomware Attacks

In the rapidly evolving landscape of cybersecurity threats, ransomware represents a significant challenge. Attackers increasingly employ sophisticated encryption methods, such as entropy reduction through Base64 encoding, and partial or intermittent encryption to evade traditional detection...

Rhysida Ransomware Cracked, Free Decryption Tool Released

Cybersecurity researchers have uncovered an "implementation vulnerability" that has made it possible to reconstruct encryption keys and decrypt data locked by Rhysida ransomware. The findings were published last week by a group of researchers from Kookmin University and the Korea Internet and...

New Ransomware Gang RA Group Hits U.S. and South Korean Organizations

A new ransomware group known as RA Group has become the latest threat actor to leverage the leaked Babuk ransomware source code to spawn its own locker variant. The cybercriminal gang, which is said to have been operating since at least April 22, 2023, is rapidly expanding its operations, accordi...

New Agenda Ransomware Variant, Written in Rust, Aiming at Critical Infrastructure

A Rust variant of a ransomware strain known as Agenda has been observed in the wild, making it the latest malware to adopt the cross-platform programming language after BlackCat, Hive, Luna, and RansomExx. Agenda, attributed to an operator named Qilin, is a ransomware-as-a-service RaaS group that...

Cybersecurity Experts Uncover Inner Workings of Destructive Azov Ransomware

Cybersecurity researchers have published the inner workings of a new wiper called Azov Ransomware that's deliberately designed to corrupt data and "inflict impeccable damage" to compromised systems. Distributed through another malware loader known as SmokeLoader, the malware has been described as...

LockFile Ransomware Bypasses Protection Using Intermittent File Encryption

A new ransomware family that emerged last month comes with its own bag of tricks to bypass ransomware protection by leveraging a novel technique called "intermittent encryption." Called LockFile, the operators of the ransomware have been found exploiting recently disclosed flaws such as ProxyShel...