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RansomHub: An Emerging Ransomware-as-a-Service

Combating Ransomware

Threat Actors

Since first emerging in February 2024, ransomware-as-a-service (RaaS) group RansomHub has added over 75 victims to its data leak site (DLS). Believed by the intelligence community to be a rebrand of the short-lived “Knight” ransomware group, RansomHub has already made a more significant impact than its alleged predecessor, based on the number of victims and high-profile targets. Recently, RansomHub was observed exploiting the Windows ZeroLogon vulnerability (CVE-2020-1472) for initial access into victim environments. 

The Knight Ransomware Connection 

Many intelligence communities believe RansomHub is a rebrand of Knight ransomware, which may be correct. However, there is an interesting timeline that paints the possibility of an alternate scenario. 

  • Advertisements for the RansomHub RaaS began in the cyber underground on February 2. They cited an encryptor written in the C++ and Go programming languages and offered adjustable encryption algorithms based on affiliate requirements. A new DLS showcasing the RansomHub brand accompanied the dark web advertisements. 

  • The Knight ransomware source code was listed for sale on the underground RAMP forum on February 18, 2024. 

  • The source code is believed to have been sold two days later, on February 20, to an unknown buyer. 

  • RansomHub listed the first victim on its DLS on February 21, one day after the believed sale of the Knight ransomware source code. 

While Arete cannot say for sure whether the threat actors behind RansomHub are the same as those behind Knight ransomware, we are certain that the RansomHub encryptor is based on the Knight ransomware source code. Considering the above timeline, the two most plausible hypotheses are that the actors behind Knight ransomware were waiting to sell their source code before officially launching the rebrand or that the actors behind RansomHub immediately began leveraging their recently purchased encryption capability to target victims in the wild. 

Victimology 

Since its emergence, RansomHub has targeted several high-profile targets and caused a broad impact across multiple sectors: 

  • Frontier: RansomHub extorted telecom giant Frontier and threatened to release 750,000 social security numbers from its customer base. 

  • Christie’s: RansomHub extorted the auction house for the wealthy with the threat of releasing data on 45,000 clients. 

  • Change Healthcare: Following a data security incident, RansomHub attempted to sell PHI stolen from the healthcare giant on the dark web. 

These incidents demonstrate that RansomHub doesn’t shy away from “big game hunting” or sensitive sectors amidst the recent wave of law enforcement actions against ransomware groups. They also showcase that the group is opportunistic when it comes to monetizing its efforts. Most ransomware groups will not invest the time or effort to sell data on the dark web in favor of simply demanding ransoms from their victims. However, RansomHub took the approach of selling the allegedly stolen data from Change Healthcare.  

Should the actors behind RansomHub prove to be the same as those behind Knight ransomware, it should be noted that Knight’s tenure in cybercrime was short lived, as the group was only active for seven months before the source code was listed for sale on RAMP forums.

While not certain, the intent of a hasty exit and rebrand could explain the motivation behind the group’s bold targeting of victims. 

Analyst Comments 

Regardless of the threat actors behind the operation or how long the group will remain active, RansomHub is currently one of the most prolific cybercrime groups active in the threat landscape. The group has targeted a wide range of high-profile victims in its short tenure thus far, and the actors are clearly not afraid to monetize their efforts in any way possible. Arete will continue monitoring for any change of tactics, dark web chatter, or the indication of a possible rebrand for the group. 

Sources 

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Adversarial AI Evolves from Prompting to Autonomous Attack Workflows

Cybercriminals and state-linked threat actors are increasingly incorporating artificial intelligence (AI) into multiple stages of offensive operations. Rather than relying on AI only for content generation or research, threat actors are now consistently using it to support reconnaissance, vulnerability discovery, credential theft, malware development, social engineering, and activities following initial compromise. The growing use of automated and agent-based workflows is allowing adversaries to coordinate offensive malicious activities with less manual involvement, potentially increasing the speed, scale, and efficiency of future campaigns.

What’s Notable and Unique

  •  In one observed campaign, threat actors used AI to plan, build, and conduct an automated credential-harvesting operation within just several hours, demonstrating how compromised infrastructure can be rapidly repurposed to support larger-scale malicious activity.

  • Arete has observed several threat groups using AI-assisted capabilities to facilitate the analysis of data obtained during exfiltration so far this year, including INC Ransom, FulcrumSec, and Settra.

  • Attackers are also attempting to reproduce proprietary AI capabilities. Large-scale automated prompting campaigns have been used to extract information about the behavior and capabilities of proprietary AI models. The use of numerous accounts and intermediary infrastructure can make these activities more difficult to identify and attribute.

Analyst Comments

AI is increasingly becoming an operational component in the threat landscape rather than simply a tool that improves attacker productivity. By connecting reconnaissance, development, credential operations, and other activities through automated workflows, threat actors can conduct campaigns more quickly and reduce reliance on continuous human input. This trend also impacts security requirements for organizations deploying AI technologies. AI models, development environments, cloud resources, identities, repositories, and automated workflows should increasingly be considered interconnected elements of the enterprise attack surface, and organizations should maintain visibility across these areas and ensure that security controls account for both conventional threats and AI-enabled attack techniques.

Sources

  • GTIG AI Threat Tracker: From Prompting to Autonomy – The Evolution of Adversarial AI

Article

Top 9 Security Controls for SMBs

In today’s complex cyber threat landscape, small and medium-sized businesses (SMBs) should implement a layered, multi-pronged approach to security. Here are some proven, effective controls to consider:

1.        Implement MFA for All Users
Multi-factor authentication (MFA) is an effective and accessible way to protect sensitive data, comply with regulatory standards, and prevent unauthorized access to critical systems. By ensuring that users not only use a password but also a secure token, an organization can significantly reduce phishing attempts, credential stuffing attacks, and ransomware incidents. MFA should be enabled for email, VPN, and critical system access.

2.        Update Patch Management Programs
A modern patching program should include policies and mechanisms to manage software updates in a timely manner. Patching efforts should address not just operating system updates, but also commonly utilized software within the environment. An active patching plan aims to reduce the mean time to patch and provide metrics on existing patch efforts. In the event of a high-severity vulnerability, a mature patching program should also be able to identify the risks and exposure for a given set of systems based on the average time to patch. This helps stakeholders make informed decisions when a new exploit is released.

3.        Leverage a Properly Managed Endpoint Detection and Response (EDR) Tool
With real-time threat detection and advanced visibility, endpoint detection and response (EDR) solutions can enhance an organization’s ability to detect and investigate potential malicious activity, including ransomware, lateral movement, fileless attacks, and more. Effective management of EDR should include proper configuration, regular agent updates, and established procedures for responding to alerts.

4.        Enhance EDR with Frontline Incident Intelligence
While EDR solutions are an important component of a security program, threat actors are continually adapting their techniques to evade detection, and as a result, standard detection methods may not always identify emerging threats or novel attack behaviors. To strengthen protection, organizations can supplement EDR tools with custom detection rules informed by incident response data. These rules can help identify indicators of compromise observed during cyber incidents, providing an additional layer of visibility beyond traditional detections.

Arete Bloktd℠ illustrates this approach by transforming threat intelligence and malware analysis into curated detection rules for EDR tools. Applying frontline intelligence to security tools can result in earlier detection, less investigative burden, and a more confident response. 

5.        Create and Continuously Test an Incident Response (IR) Plan
An incident response plan can help an organization effectively identify, respond to, and recover from a cybersecurity incident while minimizing disruption and downtime. An IR plan defines clear roles, escalation paths, communication strategies, and decision frameworks for both internal and external teams. To be effective, these plans should be regularly tested with post-incident reviews or tabletop exercises involving key stakeholders.

6.        Maintain Encrypted and Tested Data Backups
In the case of a cyberattack, backups can help organizations maintain business continuity, support ransom negotiations with threat actors, and contribute to a timely and successful recovery. Encrypting backups makes it more difficult for threat actors to access or alter them, and regular testing ensures they remain accessible during a security incident.

7.        Conduct Employee Security Awareness Training
Human error is a leading cause of cybersecurity incidents, and an organization’s employees are its first line of defense against cyber threats. Security awareness training reinforces the importance of data confidentiality, supports regulatory compliance, and helps employees recognize and understand red flags such as suspicious emails, malicious links, and social engineering attempts.

8.        Assess and Address Existing Risk and Vulnerabilities
To maintain a proactive approach to risk management and improve resilience, organizations should regularly assess existing vulnerabilities through expert-led Vulnerability Assessments, Penetration Testing, and Threat Hunting Assessments. These exercises can help identify security gaps, support regulatory compliance, and prevent potential incidents. During remediation, prioritize high-impact vulnerabilities and make a plan for periodic assessments.

9.        Apply Least-Privilege Access Controls
Employees should have access only to the systems, applications, and data necessary to perform their jobs. By removing unnecessary administrative privileges and regularly reviewing user permissions, organizations can reduce the risk of unauthorized access and limit the damage caused by compromised accounts or insider threats.

Organizations should regularly review their cybersecurity programs, stay informed about emerging threats, and evaluate whether their security controls are adapting to the evolving threat landscape.

Article

Ransomware Trends & Data Insights: August 2026

Although INC Ransom was the most active ransomware threat group observed in August 2026, overall activity remained relatively distributed across the threat landscape, with approximately 30 unique ransomware and extortion groups, including both established and newly emerged actors, observed during the month. Alongside INC Ransom, Storm, DragonForce, Qilin, and The Gentlemen were among the top five most active threat groups, underscoring the continued diversity and competitiveness of the ransomware ecosystem.

Figure 1. Activity from the top 5 threat groups in August 2026 

Throughout the month, analysts at Arete identified several trends behind the threat actors perpetrating cybercrime activities: 

  • August 2026 was a significant month for the emergence of new threat actors, with Arete identifying several previously untracked ransomware groups, including Storm, Dark Project, DireWolf, Morpheus, Orova, Spirals, Wallstreet Team, and Zawoo Team. This trend underscores the ongoing evolution of the threat landscape and the low barriers to entry for new cybercriminal operations. 

  • Arete observed a continued use of AI-enabled capabilities across the ransomware ecosystem during August. Similar to Fulcrumsec and Setra, the newly emerged Zawoo Team appears to leverage AI-assisted analysis of stolen data, publishing highly structured and detailed victim assessments on its data leak site (DLS). Additionally, both the Aurora and Storm ransomware groups have been observed utilizing AI-driven or AI-assisted chat representatives during victim communications. These developments suggest that threat actors are increasingly incorporating AI to enhance data analysis, automate victim engagement, and improve the effectiveness and scalability of extortion operations. 

  • In August, Arete also observed that despite sustained law enforcement disruption efforts, LockBit continues to demonstrate operational resilience, likely through the expansion of its affiliate ecosystem and the evolution of its tactics. Recent activity indicates an increased reliance on data theft and exfiltration-only operations, with observed victimology suggesting a notable focus on organizations within the financial sector. 

Sources

  • Arete Internal

Report

Arete's H1 2026 Crimeware Report

Explore intelligence and operational data from the frontlines of ransomware and extortion response as we detail the most significant trends and developments in the cyber threat landscape in the first half (H1) of 2026.