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ALPHV/BlackCat Ransomware Group Claims Responsibility for MGM Resorts Attack

Cyber Threats

Threat Actors

Summary

The ALPHV/ BlackCat ransomware group claimed responsibility for the MGM Resorts cyberattack in September 2023. The attack disrupted MGM’s operations, including slot machines, ATMs, and payment systems, causing significant financial and operational damage. Arete’s detailed analysis highlights ALPHV/BlackCat’s methodologies and the sectors affected by their attacks.

MGM Resorts recently identified a cybersecurity issue affecting certain of the Company’s systems. Promptly after detecting the issue, we began an investigation with assistance from leading external cybersecurity experts. We also notified law enforcement and are taking steps to protect our systems and data, including shutting down certain systems. Our investigation is ongoing, and we are working diligently to resolve the matter. The Company will continue to implement measures to secure its business operations and take additional steps as appropriate.

This incident also resulted in significant financial impact. According to NASDAQ, shares of the company’s stock have fallen 7.9%, from $43.74 to $40.29, between September 8 and 18.

The ALPHV (aka BlackCat) ransomware group claimed responsibility for this attack.

Update from ALPHV’s Dark Web Site

Arete has gained a deep understanding of ALPHV/BlackCat operations by working with nearly 100 clients impacted by the ransomware group since 2021. Arete’s Threat Intelligence team monitors multiple data leak sites and discovered that on September 14, the ALPHV group claimed they gained access to the MGM network on September 8. After multiple failed attempts to get in touch with the victim, ALPHV released their ransomware payload to more than 100 ESXi hypervisors in MGM’s network environment:

Source: Arete


Source: Arete


In this post, the group states:

“Their network has been infiltrated since Friday.”

“After waiting a day, we successfully launched ransomware attacks against more than 100 ESXi hypervisors in their environment on September 11th after trying to get in touch but failing. This was after they brought in external firms for assistance in containing the incident.”

“The ALPHV ransomware group has not before privately or publicly claimed responsibility for an attack before this point.”

“We still continue to have access to some of MGM’s infrastructure. If a deal is not reached, we shall carry out additional attacks. We continue to wait for MGM to… reach out as they have clearly demonstrated that they know where to contact us.”

Insights on ALPHV/BlackCat

Arete’s mid-year Turning Tides – Navigating the Evolving World of Cybercrime, highlighted ALPHV/BlackCat as one of the top ransomware groups observed in the second half of 2022 (H2 2022) and the first half of 2023 (H1 2023) based on data from our incident response engagements.

Source: Arete

Additional data also reveals that ALPHV/BlackCat remains one of the top three threat actor groups observed by Arete since Q3 of 2022.

Source: Arete

Below are insights on ALPHV based on Arete’s incident response engagements:

  • Sectors affected include entertainment, critical infrastructure, financial services, healthcare, manufacturing, professional services, public services, and retail.

  • Average ransom demand: $1,992,971

  • Percentage of time data exfiltration occurs: 70%

  • Average business downtime: 5.3 days

  • Tools used: CobaltStrike, Mimikatz, Megasync, LaZagne, and WebBrowserPassView

  • ALPHV/BlackCat uses various entry points to infect the victim’s network, including phishing emails, compromised credentials, and remote desktop protocol (RDP) brute force attacks.

  • Other malware is used as a stepping stone to launch the ransomware payload.

  • To increase potential reach and impact, the group targets both Windows and Linux devices, as well as network-attached storage (NAS) devices, which are often used to store backups and sensitive data.

To learn more about ALPHV/BlackCat and how to protect your organization from cyberattacks, download Turning Tides – Navigating the Evolving World of Cybercrime.

Our team of experts is here to assist you with this and any other related cyber incidents. Available services include Incident Response & Forensics, Threat Actor Negotiations, Crypto Operations, Security Operations (SOC), Restoration, and Threat Intelligence.

Cyber Emergency Hotline: 866.210.0955

New Engagements: Arete911@AreteIR.com

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Article

Europol Disrupts AudiA6 Crypto Laundering Service

European authorities have dismantled AudiA6, a major cryptocurrency laundering service linked to ransomware groups and broader cybercriminal networks. Between 2022 and 2025, the platform is believed to have processed over €336 million in illicit funds, enabling threat actors to obscure financial trails and monetize cybercrime proceeds. Its operators are also suspected of running Dark2Web, a dark web forum that facilitated collaboration, services, and connections among cybercriminals globally. This development underscores the expanding role of sophisticated, large-scale cryptocurrency laundering services in sustaining the cybercrime economy, enabling threat actors to obscure illicit funds and evade regulatory controls.

What’s Notable and Unique 

  • Following law enforcement disruption of Cryptex and Garantex, AudiA6 emerged as another platform involved in financial activities linked to ransomware groups. Investigators believe that AudiA6 became a central hub for cybercriminals seeking to launder stolen digital assets while obscuring the transaction trail from authorities.

  • On June 10, 2026, a coordinated operation resulted in two arrests in Georgia, the dismantling of key infrastructure (30+ servers, 25 domains), the freezing or seizure of over €778,000 in crypto, and the takedown of the AudiA6 and Dark2Web platforms. 

Analyst Comments

Ransomware groups and cybercriminal networks are increasingly leveraging sophisticated techniques, including chain-hopping, decentralized exchanges, and mixer-as-a-service platforms, to rapidly move illicit cryptocurrency across multiple blockchains, effectively obscuring transaction trails. Concurrently, the widespread use of fraudulent exchange accounts, mule wallets, and privacy-enhancing tools has elevated cryptocurrency laundering to a core enabler of the cybercrime ecosystem, allowing actors to bypass anti-money-laundering controls at scale. This investigation identified over 6,000 KYC records linked to money-mule accounts, many of which were tied to Russian-speaking intermediaries specifically recruited to facilitate the movement of illicit proceeds. These threat actors systematically used both commercial and domain-controlled email services to establish mule accounts across multiple cryptocurrency platforms. Collectively, these findings underscore the growing scale, coordination, and professionalization of cryptocurrency-enabled crime, highlighting the critical need for sustained, intelligence-led, and internationally coordinated efforts to disrupt these evolving financial ecosystems.

Sources

  • Ransomware gangs cut off from EUR 336 million ‘AudiA6’ crypto laundering pipeline

Article

Threat Actors Leverage AI for EDR Evasion

A threat actor has developed and deployed a ransomware attack toolkit enhanced with AI-assisted development workflows, enabling automated Active Directory (AD) discovery and improved EDR evasion capabilities. The toolkit leverages agent-based AI systems, such as Claude’s Opus and Cursor agents, for iterative malware development, testing, and refinement. 

What’s Notable and Unique 

  • Researchers have highlighted that this toolkit can not only generate ransomware code but also bypass sophisticated security defenses and identify AD networks for malware distribution. 

  • The framework incorporates multiple capabilities, including automated AD discovery and reconnaissance mechanisms, iterative EDR testing environments to refine evasion techniques, and a command-and-control (C2) infrastructure that leverages Telegram APIs and Cloudflare redirectors for stealth. 

  • Additionally, some agents were tasked with checking security research and technical posts for various bypass techniques. The agents recognized what was required for reproduction, extracted the techniques, mapped them to the MITRE ATT&CK knowledge base of adversary behaviors, set up a test lab, carried out the methodology, and reported the results. 

  • After a few repetitions, the modules seemed to avoid nearly all EDR solutions, despite the agent’s initial suggestion of a high failure rate. Although researchers found no evidence that AI was embedded in deployed malware or was operating independently in victim environments, the technology was still used to accelerate the iterative process of developing, testing, and refining payloads against security products, shortening the period between the publication of offensive security research and its practical implementation by threat actors. 

Analyst Comments 

AI-driven tools like this could accelerate the pace and sophistication of ransomware attacks, enabling even relatively inexperienced actors to launch high-impact campaigns. This development underscores the urgent need for security solutions to adapt to AI-assisted threats. Organizations must respond by strengthening detection engineering, improving visibility across environments, and maintaining robust security fundamentals.  

Sources 

  • AI-built ransomware toolkit automates EDR evasion, AD discovery  

  • Pointing a Cursor at evading detection

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Arete's 2026 Q1 Crimeware Report

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CMS Vulnerability Leads to ClickFix Campaign

Threat actors compromised at least 700 education and technology websites in a recent ClickFix campaign by exploiting a critical SQL injection flaw (CVE-2026-26980) in the Ghost content management system (CMS). Adversaries combined the vulnerability with the ClickFix social engineering tactic to steal admin keys and inject a malicious JavaScript that delivers a fake Cloudflare or CAPTCHA verification pop-up, tricking victims into copying and pasting a malicious command into their systems.

What’s Notable and Unique

  • Rather than targeting the end user first, this campaign is unique in its initial exploitation of the system, followed by social engineering attempts. This hybrid attack style is likely being leveraged to bypass traditional defenses.

  • This recent campaign also highlights how trusted web properties can be weaponized at scale and coupled with unpatched CMS vulnerabilities. Rather than using the CMS compromise to perpetrate a single attack, threat actors turned it into a supply-chain attack that ultimately affected over 700 trusted websites.

Analyst Comments

As network defenders and their tools enhance threat detection capabilities, adversaries increasingly seek methods to bypass these defenses. By combining vulnerability exploitation, social engineering techniques, and staging for ancillary attacks, this campaign successfully bypassed traditional defenses and inflicted significant impact. Defending against hybrid cyberattacks requires comprehensive security controls beyond simply patching vulnerabilities. Organizations should focus on limiting movement within the environment, detecting abuse of trusted applications, and preventing end-user manipulation.

Sources

  • 700+ education and tech websites hijacked in huge ClickFix malware campaign

  • Under the engineering hood: Why Malwarebytes chose WordPress as its CMS

  • Think before you Click(Fix): Analyzing the ClickFix social engineering technique

  • Ghost CMS Vulnerability Exploited to Infect 700 Sites With ClickFix Malware