Sunday, April 13, 2025
HomeRansomwareNnice Ransomware Attacking Windows Systems With Advanced Encryption Techniques

Nnice Ransomware Attacking Windows Systems With Advanced Encryption Techniques

Published on

SIEM as a Service

Follow Us on Google News

CYFIRMA’s Research and Advisory team has identified a new strain of ransomware labeled “Nnice,” following the continuous monitoring of underground forums as part of its Threat Discovery Process.

This ransomware specifically targets Windows systems, utilizing advanced encryption methods and employing multiple sophisticated evasion and persistence techniques.

It poses significant risks to enterprise security, emphasizing the need for robust defenses and comprehensive incident response strategies.

- Advertisement - Google News

Investigate Real-World Malicious Links & Phishing Attacks With Threat Intelligence Lookup - Try for Free

Encryption and Target Behavior

The Nnice ransomware encrypts files on the infected system and appends the distinctive extension “.xdddd” to the original file names.

After encryption, victims encounter a ransom note titled “Readme.txt,” which provides detailed instructions for restoring their data.

Ransom note
Ransom note

Additionally, the ransomware modifies the system wallpaper to further alert the victim of the attack.

Persistence and Evasion Mechanisms

Nnice ransomware demonstrates advanced persistence techniques, including bootkit deployment, DLL side-loading, and registry key manipulations, designed to ensure continued presence on the impacted systems.

It also employs obfuscation, rootkits, and sandbox detection to evade detection by conventional security mechanisms.

Beyond encryption, the ransomware incorporates methods to hinder system recovery, such as deleting forensic artifacts and modifying security tools.

Nnince Ransomware
files encrypted by Nnice Ransomware

To mitigate risks, organizations are advised to monitor and block the identified SHA-256 hash associated with the ransomware:
4dd08b0bab6f19d143cca6f96c8b780da7f60dbf74f1c16c3442bc9f07d38030.

Implement strong authentication mechanisms, such as multifactor authentication (MFA), and adopt zero-trust architecture across all critical systems.

Ensure regular backups of all essential data, stored offline and tested periodically for integrity and restorability.

Design and implement a comprehensive data breach response plan that assesses data types, storage locations, remediation processes, and regulatory notification requirements.

According to the Cyfirma, Regularly apply the latest updates and security patches across all devices, operating systems, and software applications.

Actively monitor for IOCs and enhance defensive measures based on the intelligence provided, such as blocking the hash values linked to Nnice ransomware.

The emergence of Nnice ransomware highlights the growing sophistication of cyber threats targeting Windows platforms.

Organizations must remain vigilant by strengthening their defenses and proactively monitoring for threat indicators to mitigate potential data breaches and operational disruptions.

Integrating Application Security into Your CI/CD Workflows Using Jenkins & Jira -> Free Webinar

Aman Mishra
Aman Mishra
Aman Mishra is a Security and privacy Reporter covering various data breach, cyber crime, malware, & vulnerability.

Latest articles

Threat Actors Manipulate Search Results to Lure Users to Malicious Websites

Cybercriminals are increasingly exploiting search engine optimization (SEO) techniques and paid advertisements to manipulate...

Hackers Imitate Google Chrome Install Page on Google Play to Distribute Android Malware

Cybersecurity experts have unearthed an intricate cyber campaign that leverages deceptive websites posing as...

Dangling DNS Attack Allows Hackers to Take Over Organization’s Subdomain

Hackers are exploiting what's known as "Dangling DNS" records to take over corporate subdomains,...

HelloKitty Ransomware Returns, Launching Attacks on Windows, Linux, and ESXi Environments

Security researchers and cybersecurity experts have recently uncovered new variants of the notorious HelloKitty...

Resilience at Scale

Why Application Security is Non-Negotiable

The resilience of your digital infrastructure directly impacts your ability to scale. And yet, application security remains a critical weak link for most organizations.

Application Security is no longer just a defensive play—it’s the cornerstone of cyber resilience and sustainable growth. In this webinar, Karthik Krishnamoorthy (CTO of Indusface) and Phani Deepak Akella (VP of Marketing – Indusface), will share how AI-powered application security can help organizations build resilience by

Discussion points


Protecting at internet scale using AI and behavioral-based DDoS & bot mitigation.
Autonomously discovering external assets and remediating vulnerabilities within 72 hours, enabling secure, confident scaling.
Ensuring 100% application availability through platforms architected for failure resilience.
Eliminating silos with real-time correlation between attack surface and active threats for rapid, accurate mitigation

More like this

HelloKitty Ransomware Returns, Launching Attacks on Windows, Linux, and ESXi Environments

Security researchers and cybersecurity experts have recently uncovered new variants of the notorious HelloKitty...

RansomHub Ransomware Group Hits 84 Organizations as New Threat Actors Emerge

The RansomHub ransomware group has emerged as a significant danger, targeting a wide array...

Sensata Technologies Breached: Ransomware Attack Key Systems

Sensata Technologies Holding PLC, a global leader in sensor solutions and electrical protection, is...