Skip to content
Cyber Threat
CTI Academy Sponsor CTI Academy
Ransomware victim Energy

SIRIUS S.R.L.

Listed by Nitrogen on · organisation based in Italy

sirius.to.it

Disclosed
Mar 31, 2025
Leak-site listing date
Threat group
Nitrogen
49 victims listed
Country
Italy
#5 most targeted
Sector
Energy

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Nitrogen. Figures and technique mappings are quoted from the source data, not inferred.

About the Nitrogen group

Nitrogen began as a malware loader in 2023 used to deliver BlackCat/ALPHV ransomware, then evolved into a fully independent ransomware operator by mid-2024, operating its own strain derived from leaked Conti 2 builder code and conducting double-extortion attacks primarily linked to Eastern European infrastructure. Nitrogen has listed 48 victims since March 2023.

How Nitrogen is documented to operate

Drive-by Compromise T1189 Initial Access

Adversaries may gain access to a system through a user visiting a website over the normal course of browsing. Multiple ways of delivering exploit code to a browser exist (i.e., Drive-by Target), including: A legitimate website is compromised, allowing adversaries to inject malicious code Script files served to a legitimate website from a publicly writeable cloud storage bucket are modified by an adversary Malicious ads are paid for and served through legitimate ad providers (i.e., Malvertising) Built-in web application interfaces that allow user-controllable content are leveraged for the insertion of malicious scripts or iFrames (e.g., cross-site scripting) Browser push notifications may als…

Mitigations: Restrict Web-Based Content, User Training, Application Isolation and Sandboxing, Exploit Protection, Update Software

MITRE ATT&CK reference
Command and Scripting Interpreter T1059 Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell. There are also cross-platform interpreters such as Python, as well as those commonly associated with client applications such as JavaScript and Visual Basic.

Mitigations: Restrict Web-Based Content, Limit Software Installation, Execution Prevention, Code Signing, Behavior Prevention on Endpoint, Privileged Account Management

MITRE ATT&CK reference
Scheduled Task/Job T1053 Execution Persistence

Adversaries may abuse task scheduling functionality to facilitate initial or recurring execution of malicious code. Utilities exist within all major operating systems to schedule programs or scripts to be executed at a specified date and time. A task can also be scheduled on a remote system, provided the proper authentication is met (ex: RPC and file and printer sharing in Windows environments). Scheduling a task on a remote system typically may require being a member of an admin or otherwise privileged group on the remote system. Adversaries may use task scheduling to execute programs at system startup or on a scheduled basis for persistence.

Mitigations: Operating System Configuration, User Account Management, Restrict File and Directory Permissions, Privileged Account Management, Audit

MITRE ATT&CK reference

MITRE ATT&CK techniques attributed to Nitrogen across its recorded activity, not a finding about how SIRIUS S.R.L. was reached.

Incident analysis

SIRIUS S.R.L. was listed by Nitrogen ransomware, a group with 49 victims recorded in this database. The listing appeared on the group's leak site on March 31, 2025.

SIRIUS S.R.L. is based in Italy and operates in the Energy sector. Italy ranks #5 worldwide for ransomware disclosures, with 617 victims in this database.

Sector context. Energy sector attacks can have critical infrastructure implications. Ransomware on operational technology (OT) networks can disrupt power generation and distribution, elevating the urgency of recovery.

Nitrogen typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was SIRIUS S.R.L. attacked by ransomware?

Yes. SIRIUS S.R.L. was listed as a victim of the Nitrogen ransomware group on March 31, 2025. The organisation is based in Italy and operates in the Energy sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked SIRIUS S.R.L.?

SIRIUS S.R.L. was attacked by Nitrogen ransomware. Nitrogen is one of the most active ransomware groups, having claimed 49 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the SIRIUS S.R.L. ransomware attack occur?

The ransomware attack on SIRIUS S.R.L. was disclosed on March 31, 2025. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the SIRIUS S.R.L. ransomware attack?

The specific data stolen from SIRIUS S.R.L. has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Energy organisation, SIRIUS S.R.L. likely held sensitive business data, client information, and operational records.

How can organisations protect against Nitrogen attacks?

To defend against Nitrogen and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.