Rhysida Ransomware Group's Attack on Lee Spring

Rhysida ransomware group claimed an attack on Lee Spring. The group has exfiltrated data, including passports and financial documents, with a ransom demand of 8 BTC (approximately $340,000). Lee Spring manufactures stock springs and custom springs, formed metal parts, and related products for a wide range of industries.

The Emergence of Rhysida Ransomware Group

The Rhysida ransomware group emerged in May 2023 and introduced a victim support chat portal on the TOR network. They present themselves as a "cybersecurity team" and claim to be helping their victims by targeting their systems and exposing potential security issues.

Method of Attack

Rhysida deploys its ransomware through various methods, including Cobalt Strike or similar frameworks, as well as phishing campaigns. Analysis of Rhysida ransomware samples suggests that the group is still in the early stages of development. The ransomware lacks certain standard features in contemporary ransomware, such as VSS removal. However, the group follows the practices of modern multi-extortion groups by threatening to distribute the stolen data publicly.

Execution and Ransom Process

Upon execution, Rhysida displays a cmd.exe window and scans all files on local drives. Victims are instructed to contact the attackers using the TOR-based portal and their unique identifier provided in the ransom notes. The group only accepts payment in Bitcoin (BTC) and provides victims with instructions on purchasing and using BTC through the victim portal. Victims are also given an additional form on the payment portal to provide authentication and contact details to the attackers. The Rhysida ransom notes are written as PDF documents and placed in the affected folders on the targeted drives.