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Cloudflare Joins International Takedown of Lumma Stealer Malware

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3 weeks ago

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Cloudflare’s Cloudforce One and Trust and Safety team participated in a coordinated disruption effort targeting the Lumma Stealer malware operation. Lumma Stealer (also known as LummaC2) is part of a broader class of information-stealing malware that poses a serious threat to both individuals and organizations. By exfiltrating credentials, cryptocurrency wallets, cookies, and other sensitive data from infected machines, Lumma facilitates a wide range of downstream criminal activity, including financial fraud, identity theft, and enterprise breaches that can lead to ransomware. Disrupting this ecosystem is critical to protecting users, undermining the cybercrime economy, and preventing further harm.

Lumma Stealer attempted to abuse numerous service providers’ infrastructure, including Cloudflare, to support their malware operations. Cloudflare detected Lumma Stealer’s abuse and participated in a Microsoft-led disruption effort. As part of this effort, Microsoft collaborated with other private industry partners, both those directly impacted and those providing intelligence and technical support, along with the U.S. Department of Justice, Europol’s European Cybercrime Center (EC3), and Japan’s Cybercrime Control Center (JC3).

In a Nutshell
Lumma Stealer is Malware-as-a-Service offering that allows criminals to rent access to an administrative panel, where they can retrieve stolen data and generate customized builds of the malware payload for distribution to victims worldwide. Like most other information stealing malware, Lumma Stealer is spread primarily through social engineering campaigns that lure targets into following instructions that result in the download and execution of malware.

The Lumma Stealer disruption effort denies the Lumma operators access to their control panel, marketplace of stolen data, and the Internet infrastructure used to facilitate the collection and management of that data. These actions impose operational and financial costs on both the Lumma operators and their customers, forcing them to rebuild their services on alternative infrastructure.

Mitigating Lumma Stealer activity
Properly defending against Lumma Stealer involves a layered security approach, since it’s a fast-evolving infostealer often delivered via malvertising, phishing, or compromised software. Enterprise defenders should carefully restrict access to new domains, as newly registered domains (NRDs) are a common tactic extensively used by LummaC2. Users outside of an enterprise may consider limiting or preventing the execution of PowerShell and other scripts if it is not required. Enterprise defenders should also consider the following:

  1. Endpoint protection and hardening
  2. Do not permit users to download executable files from untrusted websites
  3. Do not permit users to download or execute scripts or Microsoft Office macros that were downloaded from the Internet, are unsigned, or that are not explicitly allowed by policy
  4. Use reputable endpoint detection and response (EDR) tools that can detect suspicious behaviors, like credential scraping or unauthorized file access
  5. Application allowlisting to prevent unknown executables (including downloaded payloads) from running
  6. Disable PowerShell for non-administrative users, or use Constrained Language Mode to reduce abuse risk

Browser and credential hygiene

  • Avoid saving passwords in browsers—use a dedicated password manager instead.
  • Clear autofill data and browser caches regularly
  • Disable autofill for sensitive information like names, phone numbers, or addresses, especially on corporate machines

Patch and update regularly
Keep browsers, operating systems, and all software up to date to reduce exploitability via known vulnerabilities

DNS and network filtering
Use secure DNS filtering and threat intelligence-based blocklists to prevent connections to NRDs, known C2 servers, malware delivery domains, and Telegram APIs used for data exfiltration

Email and web filtering

  • Implement malicious attachment and link detection in email gateways
  • Deploy browser isolation or sandboxing to reduce the risk of drive-by downloads from malvertising

User training

  • Educate users about malvertising, fake software installers, and browser scareware tactics like ClickFix, which are common delivery mechanisms
  • Warn users not to run PowerShell scripts or click on scare popups instructing them to “fix” computer issues

Detection and threat hunting

  • Monitor for unusual outbound connections (especially to Telegram or rare domains)
  • Monitor for unauthorized credential access from browsers
  • Monitor for suspicious PowerShell or process spawning activity (e.g., explorer.exe spawning powershell.exe)
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Cloud

SentinelOne Simplifies Secure Cloud Migrations on AWS

Published

9 hours ago

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June 13, 2025

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SentinelOne today announced its participation in the Amazon Web Services (AWS) Independent Software Vendor (ISV) Workload Migration Program. This initiative supports AWS Partner Network (APN) members with SaaS offerings on AWS to accelerate and streamline workload migrations.

Through the program, SentinelOne will provide AWS customers with accelerated, secure cloud migration support, leveraging modern AI-powered CNAPP capabilities to ensure rapid and protected transitions. With access to AWS funding, technical resources, and go-to-market support, SentinelOne will help organizations reduce migration timelines and costs while maintaining robust security.

SentinelOne’s Singularity Cloud Security delivers real-time visibility and protection throughout the migration journey—whether from on-premises or another cloud—enabling a secure, seamless transition to AWS.

“Through our participation in the AWS ISV Workload Migration Program, SentinelOne is helping customers accelerate secure cloud migrations with end-to-end protection and visibility,” said Ric Smith, President of Product, Technology, and Operations at SentinelOne. “Whether moving from on-prem or another cloud to AWS, organizations can count on us to deliver the security they need throughout their journey—realizing the performance, speed, agility, and cost benefits of the cloud.”

Singularity Cloud Security combines agentless and agent-based protection for deep visibility, continuous posture management, and real-time threat detection across hybrid and multi-cloud environments. By collaborating with AWS and ecosystem partners, SentinelOne ensures seamless integration into migration projects, helping customers move faster, reduce risk, and scale confidently in the cloud.

Availability: SentinelOne’s solutions are available globally.

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Cyber Security

Beyond Blocklists: How Behavioural Intent Analysis Can Safeguard Middle East Businesses from Rising AI-Driven Bot Threats

Published

3 days ago

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June 10, 2025

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The Middle East is facing an unprecedented surge in AI-driven bot attacks, with malicious automation now outpacing traditional defenses. Mohammad Ismail, Vice President for EMEA at Cequence Security, warns that legacy tools like IP blocklists and rate limiting are no match for today’s sophisticated threats (more…)

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Cyber Security

Sophos Boosts Firewall with New Protection and Incident Response Features

Published

3 days ago

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June 10, 2025

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Sophos has announced a significant update to its Sophos Firewall software, introducing enhanced protection and incident response capabilities. This update notably includes Sophos NDR Essential, a new feature now available free of charge to all customers holding an XStream Protection license for Sophos Firewall.

This integration empowers Sophos Firewall with two dedicated artificial intelligence (AI) engines specifically designed to detect both malware communications and those utilizing algorithmically generated domain names. This advanced functionality, derived from the Sophos Network Detection and Response (NDR) probe, aims to identify sophisticated malware communications even if they are previously unknown or not yet indexed. It serves as a powerful complement to the Active Threat Response capabilities already embedded within Sophos firewalls.

Chris McCormack, Senior Product Marketing Manager at Sophos

Addressing the technical demands of such advanced detection, Chris McCormack, Senior Product Marketing Manager at Sophos, explained the strategic approach, “NDR traffic analysis requires substantial processing power. That’s why we’ve adopted a new approach by deploying an NDR solution in Sophos Cloud to offload the heaviest tasks from the firewall.” This cloud-centric design ensures optimal performance without burdening the firewall’s on-device resources.

Beyond network detection, the update also brings significant improvements to connectivity and user authentication. Sophos Connect now integrates EntraID for Single Sign-On (SSO). This new feature for the VPN client, bundled with Sophos Firewall, is set to enhance both the security and user experience for SSL and IPsec VPN connections. The integration with EntraID (Azure AD) enables users to authenticate and leverage multi-factor authentication for both Sophos Connect and access to the user portal hosted by the firewall, streamlining secure access.

Further VPN-related enhancements include:

  • Improved user interface and usability: Connection types have been renamed for greater clarity, with “site-to-site” now referred to as “policy-based” and tunnel interfaces as “route-based,” making configurations more intuitive.
  • Dynamic validation of the IP address pool: For VPN connections (SSL VPN, IPsec, L2TP, and PPTP), the system now dynamically validates the allocated IP address pool, helping to better resolve potential IP address conflicts.
  • Strict profile enforcement: IPsec profiles now exclude default values to ensure algorithm synchronization, effectively eliminating potential fragmentation of session negotiation packets that could otherwise prevent site-to-site VPN tunnels from being established.
  • Route-based VPN and SD-RED scalability: The system has been optimized to support up to 3,000 simultaneously established tunnels. Specifically, Sophos Firewall solutions can now manage up to 1,000 SD-RED site-to-site tunnels and connect up to 650 concurrent SD-RED devices.

Additional management improvements enhance administrative flexibility and search capabilities:

  • More flexible DHCP Prefix Delegation (IPv6 DHCP-PD): The system now supports a broader range of prefixes, from /48 to /64, improving compatibility with various internet service providers.
  • Router Advertisement (RA) and DHCPv6 server: These features are now enabled by default, simplifying IPv6 network setup.
  • Resizable table columns: The web admin interface continues its adaptation for ultra-wide screens, with many configuration pages now allowing users to resize columns as needed for improved usability.
  • Enhanced object search functionality: The search field within the SD-WAN routing configuration screen now supports more granular criteria, including route name, ID, objects, and object values like IP addresses and domains. Similarly, local ACL rules now also support object name and value searches, extending to content-based searches for more precise results.
  • Default configuration changes: To streamline initial setups, default firewall rules and rule groups previously created during new firewall deployments have been removed. The initial configuration now only includes the default network rule and MTA rules. Furthermore, the default firewall rule group and the default gateway probe for custom gateways are now set to “None” by default.

Sophos continues its commitment to cybersecurity through a “Secure by Design” approach, enhancing the intrinsic security of its firewalls. This methodology involves the containerization of specific features and rigorous integrity checks on critical operating system files using mathematical checksums. Any detected checksum mismatch triggers a potential compromise alert, enabling monitoring teams to proactively identify possible security incidents affecting the firewall OS integrity. This proactive detection allows incident response and development teams to react swiftly to critical security events.

This update is now available for manual download and deployment by customers with any Sophos Firewall equipped with a valid license.

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