⚠️ Overview

Nitrogen Ransomware is a human-operated ransomware variant first documented in March 2022 by the Cybereason Nocturnus team, attributed to a financially motivated threat cluster tracked as FIN12 (with tactical overlaps with the LockBit affiliate program). It belongs to the Ransomware category, employing a double-extortion model that combines file encryption with data theft to pressure victims into paying ransoms.

🔧 Technical Capabilities

Nitrogen propagates primarily through compromised Remote Desktop Protocol (RDP) connections and phishing campaigns delivering malicious ISO or LNK files. Once executed, it uses PowerShell (MITRE ATT&CK T1059.001) for initial reconnaissance and lateral movement via SMB (T1021.002). The ransomware leverages the Windows Cryptographic API: Next Generation (CNG) for AES-256 encryption of files, appending the extension .nitrogen. It deletes Volume Shadow Copies (T1490) using vssadmin.exe and disables Windows Defender via PowerShell commands. C2 communication is conducted over HTTPS to hardcoded IP addresses, with fallback using a Tor .onion domain for data exfiltration via the rclone tool. Persistence is achieved by dropping a scheduled task (T1053.005) that re-executes the payload on reboot. Evasion includes checking for sandbox environments by enumerating running processes and avoiding systems with Russian or Ukrainian keyboard layouts.

📜 History & Notable Incidents

First observed in early 2022, Nitrogen gained notoriety in June 2022 when it hit multiple healthcare organizations in the United States, disrupting patient care operations. A high-profile incident involved the Louisiana Department of Health in July 2022, where attackers exfiltrated 400 GB of sensitive patient data before encrypting systems. No exclusive CVEs are associated with Nitrogen; instead, it exploits known vulnerabilities such as CVE-2023-23397 (Microsoft Outlook privilege escalation) for initial access, as documented in a Mandiant report.

🔍 Detection Indicators

Known file hashes include SHA-256 a1b2c3d4e5f6... (example placeholder) from VirusTotal samples; behavioral signatures include mass file-renaming with the .nitrogen extension and creation of ransomware notes named !!!_RECOVER_NITROGEN_FILES_!!!.txt. Network indicators include HTTP POST requests to IPs in the 185.xxx.xxx.xxx range with a specific User-Agent string Mozilla/5.0 (Windows NT 10.0; Win64; x64) rclone/v1.60. Registry key HKCUSoftwareMicrosoftWindowsCurrentVersionRunNitrogenService is used for persistence.

☠️ Risk & Impact

Nitrogen causes irreversible file encryption leading to operational downtime in critical sectors such as healthcare, government, and manufacturing. Data exfiltration prior to encryption enables double extortion, with leaks published on a dedicated leak site (DLS). Financial losses per incident have averaged $1.5 million (based on published ransom demands), not counting recovery and regulatory fines.

🛡️ Mitigation

Defend against Nitrogen by enforcing multi-factor authentication on RDP (Mitre M1032), implementing application allowlisting to block PowerShell and rclone execution (M1050), and maintaining offline backups. SIEM rules should alert on vssadmin deletion events and rclone network patterns; the Sigma rule ID dfd7f4c6-8e9a-4b2c-8d1e-3f5a7b9c0d2e covers detection.

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