Article
Active Exploitation of File Transfer Vulnerabilities
Cyber Threats
At Arete
Cybersecurity Trends

Threat actors are actively exploiting two critical vulnerabilities in CrushFTP and Gladinet’s CentreStack and Triofox products, leading to data exfiltration and extortion. CrushFTP, a managed file transfer solution, is vulnerable to an authentication bypass vulnerability designated CVE-2025-31161. The flaw is simple to exploit, and public exploit code is readily available, increasing risk for organizations that use the platform. Meanwhile, Gladinet’s CentreStack and Triofox products, both file-sharing and remote access platforms, are impacted by a critical remote code execution (RCE) vulnerability stemming from a hardcoded key in its configuration. This flaw (CVE-2025-30406) allows attackers to forge payloads and execute arbitrary code on the server.
What’s Notable and Unique
CVE-2025-31161 is a critical vulnerability affecting CrushFTP v10 and v11 and allows unauthenticated attackers to temporarily authenticate as any user, including administrators, leading to full server compromise. Over 1,500 vulnerable instances have been exposed, and as of April 10, 2025, approximately 440 organizations in North America remain vulnerable.
After exploiting the CrushFTP vulnerability, threat actors often install remote monitoring and management (RMM) tools like AnyDesk and MeshAgent before harvesting credentials. When certain threat actors exploit the vulnerability, they also install a Telegram bot to exfiltrate telemetry from infected hosts.
CVE-2025-30406 is a deserialization vulnerability in CentreStack and Triofox caused by the use of a hardcoded or weakly protected ‘machineKey’ in the IIS ‘web.config’ file, which secures ASP.NET ViewState data. If an attacker can obtain or predict this key, they can forge ViewState payloads that pass integrity checks and trigger deserialization, potentially resulting in remote code execution.
Upon successful exploitation, threat actors often deploy a malicious executable, install the MeshCentral remote access tool, and conduct lateral movement within the network. The vulnerable Triofox product is commonly used by managed service providers (MSPs), posing a serious threat to MSPs and their customers.
Analyst Comments
Overlaps in post-exploit techniques of CVE-2025-30406 (CentreStack and Triofox) and CVE-2025-31161 (CrushFTP), indicate potentially coordinated threat activity or shared attacker infrastructure. Threat actors have installed MeshCentral and used IP address 2.58.56[.]16 for post-exploitation communication in incidents after the exploit of both vulnerabilities. However, based on observed behavior and the ease of exploitation, multiple threat actors are likely exploiting these vulnerabilities. At least one threat actor, KillSec, has publicly claimed exploitation and exfiltration by leveraging the CrushFTP vulnerability. Arete has observed other threat actors extort victims after allegedly exploiting the CrushFTP vulnerability.
The CrushFTP vulnerability has been exploited since March 31, 2025, so any organizations using a vulnerable version of CrushFTP that have not updated should assess for potential unauthorized access and exfiltration. Organizations using a vulnerable version of CrushFTP can take two actions to remediate the vulnerability: upgrade to version 10.8.4 or version 11.3.1 or enable a DMZ proxy instance. Applying the patch will not remove the access of any threat actors who have already exploited the vulnerability and created a new valid user account for the application. For organizations affected by the CentreStack and Triofox vulnerability, an updated version was released by the company that resolves the vulnerability and generates a new machine key.
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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
Article
Arete's 2026 Q1 Crimeware Report
Harness Arete’s unique data and expertise on extortion and ransomware to inform your response to the evolving threat landscape.
Article
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



