DIY Ransomware Makes Novice Cybercriminals A Threat

Research by Kaspersky’s Global Research and Analysis Team (GReAT) has revealed that recent ransomware attacks using leaked source codes by new cybercriminals make them a menace. It enables threat actors to seek out victims and swiftly propagate malicious activities. The report describes the recent ransomware attacks with the use of leaked code. This research sheds light on the tools and methods used by organised ransomware groups and individual attackers.

With a vast array of tools and samples at their disposal, organised ransomware cybercriminal groups often have proprietary ransomware samples while standalone criminals frequently rely on leaked DIY variants to launch their attacks.

“The barrier to entry for launching ransomware attacks has plummeted. With off-the-shelf ransomware and affiliate programmes, even novice cybercriminals can pose a significant threat,” comments Jornt van der Wiel, a Senior Cybersecurity Researcher at GReAT.

The following instances are particularly noted:

SEXi. In April 2024, the SEXi group launched a ransomware attack against data centre and hosting provider IxMetro, utilising a newly identified software variant. This group targets ESXi applications, with all known victims running unsupported versions. SEXi group distinguishes itself by using different ransomware variants for different platforms – Babuk for Linux and Lockbit for Windows. Uniquely, they employ the Session communication app for contact, using a universal user ID across multiple attacks. This lack of professionalism and the absence of a TOR-based leak site further set them apart.

Key Group. The Key Group, also known as keygroup777, has utilised eight different ransomware families since its inception in April 2022. Their techniques and persistence mechanisms have evolved with each new variant. The UX-Cryptor variant, for example, employed multiple registry entries for persistence, while the Chaos variant used a different approach involving the Startup folder. Despite their diverse methods, Key Group is noted for its unprofessional operations, including using a public GitHub repository for C2 communication and Telegram for interaction, making them easier to track.

Mallox. Mallox, a lesser-known ransomware variant, first appeared in 2021. Soon after its inception, the group began its affiliate programme. In 2023, there were 16 active partners. Unlike SEXi and Key Group, Mallox’s authors claim to have purchased the source code. They are also very explicit about what types of organisations affiliates should infect: no less than $10 million in revenue and no hospitals or educational institutions. Mallox’s affiliates tracked through unique IDs contributed to significant spikes in activity in 2023.

While groups using leaked variants may not exhibit high levels of professionalism, their effectiveness lies in successful affiliate schemes or niche targeting as illustrated by Key Group and SEXi. The publication and leakage of ransomware variants thus pose substantial threats to organisations and individuals.

To keep your data protected from ransomware:
• Set up offline backups that intruders cannot misuse, and ensure you can access them quickly in an emergency.
• Always keep software updated on all your devices to prevent ransomware from exploiting vulnerabilities.
• Use a protection solution for endpoints and mail servers with anti-phishing capabilities to decrease the chance of infection through a phishing email.
• Use protection solutions for mail servers with anti-phishing capabilities, to decrease the chance of infection through a phishing email.
• If using Microsoft 365 cloud service, don’t forget to protect it too. Get a dedicated anti-spam and anti-phishing product to protect SharePoint, Teams and OneDrive apps for secure business communications.
• Provide your staff with basic cybersecurity hygiene training and conduct a simulated phishing attack to ensure that your employees know how to distinguish phishing emails.
• Assess and audit your supply chain and managed services’ access to your environment.