News & Insights

On March 4th 2026, a coalition of Law Enforcement and private sector partners announced a major international public-private disruption operation targeting Tycoon 2FA. This leading phishing-as-a-service platform was used by thousands of cybercriminals to bypass multi-factor authentication and enable large-scale account compromise globally. Details of the operation were shared by partners and a new Shadowserver National CSIRT-only Special Report was run, sharing data about observed Tycoon 2FA infrastructure domains. Analysis of the reported Tycoon 2FA domains is provided.

On Thursday 13th November 2025, international law enforcement partners announced a disruption action against the Rhadamanthys information stealer malware. As part of the ongoing Operation Endgame initiative, law enforcement acquired copies of the threat actor’s databases containing historical Rhadamanthys infections, which covered the period March 2025 to November 2025. These databases contain records of over 86 million stolen data items from over 525,000 Rhadamanthys infections across 226 countries. Shadowserver is sharing elements of this dataset as a one-off Special Report, to allow historical Rhadamanthys infections to be investigated and any secondary malware identified and remediated by system defenders.

A review of Shadowserver’s 20th year as the world’s largest provider of free, timely, actionable, daily cyber threat intelligence. Covering the latest improvements in our public benefit services, responses to emerging cyber threats, and detection and reporting of the latest vulnerabilities to National CSIRTs and system defenders globally. We provide highlights of our cybersecurity capacity building efforts, plus successful outcomes from our free support to Law Enforcement in major cybercrime disruption operations.

A non-profit consortium – consisting of The Hague Humanity Hub, the CyberPeace Institute (CPI), Connect2 Trust Foundation and The Shadowserver Foundation, co-funded by Rijksdienst voor Ondernemend Nederland (RVO), will produce a national level assessment of the cyber threat landscape for NGOs, while measuring the impact and harm of cyber threats on the sector.

On Tuesday 29th August 2023, the US DoJ and FBI, together with other global law enforcement partners, announced a disruption action against the Qakbot botnet. This involved the FBI deleting the Qakbot malware from infected victim computers under US court order. As part of their operation, the FBI acquired a copy of the threat actor’s database of historical Qakbot infections, which covered the period July 2019 to August 2023. This database contains a record of over 700,000 discrete Qakbot bot infections in 230 countries. Shadowserver is sharing elements of this dataset as a one-off Special Report, to allow historical Qakbot infections to be investigated and any secondary malware identified and remediated by system defenders.

The Shadowserver Foundation and trusted partners have observed three different malicious campaigns that have exploited CVE-2023-3519, a code injection vulnerability rated CVSS 9.8 critical in Citrix NetScaler ADC and NetScaler Gateway. The summary below is based on collaboration with the individual compromised organizations, as well as their commercial incident response teams. All timestamps in this write-up are in UTC timezone, and they have all been slightly adjusted to not disclose the actual times. If you own a Citrix NetScaler or have those in your constituency, please follow the detection and hunting advice for signs of compromise and webshells!

We are happy to continue our efforts in collaboration with the UK FCDO, building on our previous global outreach to Africa, Indo-Pacific, Central and Eastern Europe (CEEC), and Association of Southeast Asia Nations (ASEAN) regions to produce a cyber security spotlight on the Gulf Region. For a review of previous UK FCDO supported activities please read a) UK Foreign, Commonwealth & Development Office funds Shadowserver surge in Africa and Indo-Pacific regions, b) Continuing Our Africa and Indo-Pacific Regional Outreach, c) More Free Cyber Threat Intelligence For National CSIRTs and d) Shadowserver’s New Public Dashboard.

Shadowserver has recently been funded by the UK Foreign, Commonwealth & Development Office (FCDO) to provide more detailed and tailored cyber threat insight support to countries in the Association of Southeast Asia Nations (ASEAN), specifically Indonesia, Malaysia, Philippines and Thailand. These activities included obtaining a better understanding of the device makeup of the exposed attack surface in those countries, vulnerability exposure (especially relating to emerging threats) and observed attacks/infected devices - coming both from and directed at the region. The intention is to enrich Shadowserver's free daily threat feeds and public benefit services to the region, providing National CSIRTs and other system defender entities (organizations that are network owners) with a better awareness of their threat and vulnerability landscape, thus helping them to improve their cybersecurity posture.

The UK’s National Cyber Security Centre (NCSC) and the US Cybersecurity and Infrastructure Security Agency (CISA) issued an alert on nation-state sponsored exploitation of router infrastructure. The alert calls out SNMP public exposure and one vulnerability in particular - CVE-2017-6742 - which relates to a long known “remote code execution” opportunity on certain Cisco routers. This alert is a timely reminder for all with unpatched equipment to think broadly! We use this opportunity to highlight our data and free daily reports that provide information on the SNMP and Cisco device exposed attack surface (and more!).

We are happy to announce multiple enhancements to our public Dashboard, particularly to the Exploited Vulnerability data collected by our server-side honeypot sensors, thanks to funding provided by the UK Foreign Commonwealth and Development Office (FCDO).