Learn how recent DDoSIA campaigns against Denmark and Greenland fit into the broader pro‑Russian hacktivist strategy, what these attacks reveal about the broadening number of targets, and why similar tactics are likely to recur. Drawing on CSIS analysis and data, we provide concrete recommendations for organisations on where to focus their defensive efforts.
The DDoSIA attacks and why they deserve attention
Denmark and Greenland have recently faced repeated distributed denial‑of‑service (DDoS) campaigns linked to the pro‑Russian hacktivist ecosystem around NoName057(16) and its DDoS project, DDoSIA. These attacks have not compromised systems, stolen data, or affected voting processes, but they have been persistent, visible, and closely aligned with Denmark’s political and social calendar.
CSIS observes two main phases: a campaign around Denmark’s 2026 general election, following earlier 2025 election‑related activity, and a second around Easter 2026 targeting public services, transport, financial services, utilities, local providers, and Greenlandic organisations.
Together, these campaigns show how a low‑cost DDoS‑as‑a‑service operation can function as political pressure: DDoSIA does not need long outages, only visible disruption at moments of high public attention.
What DDoSIA’s Attacks Reveal About Today’s Cyber Threat Landscape
DDoSIA is associated with NoName057(16), a pro‑Russian hacktivist collective that has repeatedly targeted countries perceived as supporting Ukraine. The group’s model relies on volunteer participation, public target lists, Telegram‑based coordination, and rapid claims of responsibility.
This context matters. DDoSIA campaigns are not usually designed to achieve deep technical compromise. Instead, their value lies in disruption, visibility, and messaging.
According to Stefan Tanese, Cyber Intelligence Expert at CSIS, DDoSIA’s activity shows how low‑complexity disruption can be used to amplify political narratives.
“A short outage on a ministry website, political party domain, transport portal, bank subdomain, or Greenlandic public‑service site may have limited operational impact,” says Stefan. “But if it happens during an election, holiday travel period, or geopolitical dispute, the same outage can generate public anxiety, media attention, and reputational pressure.”
How DDoSIA works
DDoSIA is built around a volunteer‑driven model. Participants install a client — historically written in Go — receive a unique user hash through the project’s infrastructure, then retrieve dynamic target lists from short-lived command-and-control servers and generates attack traffic against selected hosts.
The tool supports multiple attack types. CSIS has observed activity consistent with HTTP GET and POST floods against web applications, often using randomized parameters to make requests look more varied and to reduce simple caching benefits. DDoSIA tooling has also been associated with transport-layer floods, including SYN and ACK-style traffic, as well as low-and-slow techniques intended to exhaust connection handling.
The most relevant feature in the Denmark and Greenland campaigns is the application-layer focus. Rather than only trying to saturate bandwidth, DDoSIA frequently targets functions that force back-end work: login, password reset, search, booking, checkout, subscription, contact, and API endpoints. These requests can trigger database lookups, session handling, form validation, dynamic content generation, or authentication logic.
As a result, even moderate traffic volumes can have disproportionate impact, especially against smaller organisations or poorly protected web applications.
DDoSIA Targets Denmark’s 2025 Elections
CSIS data shows that Denmark was already a recurring DDoSIA target in 2025. The clearest early concentration came around the November 2025 municipal and regional elections, when political party websites, municipal platforms, public‑service portals, media, transport services, and other Danish institutions appeared on DDoSIA target lists.
This activity established an important pattern: DDoSIA was aligning activity with Denmark’s democratic calendar. The attacks did not affect voting itself, but they were well suited to creating noise around the election environment.
Consequently, after Denmark announced a snap general election on 24 March 2026, CSIS observed renewed DDoSIA targeting of Danish and Greenlandic organisations. However, this time, the 2026 campaign was even broader, more sustained, and more closely tied to overlapping geopolitical narratives involving Ukraine, Greenland, and Arctic security.
Broader Attacks During the 2026 Danish Election
CSIS data from late February and March 2026 shows renewed DDoSIA targeting of Danish institutions and political entities shortly after the election was announced. The target set expanded to include ministries, municipalities, courts and prosecution‑related services, transport and maritime organisations, media, universities, energy providers, citizen‑service platforms—and Greenlandic entities.
This breadth is important. The campaign was not narrowly focused on election infrastructure. Instead, DDoSIA targeted the wider public ecosystem around the election: services citizens recognise, institutions associated with state authority, and sectors likely to attract attention if disrupted. Political party infrastructure mattered for its symbolic value; government and municipal portals increased public visibility; transport and logistics targets created potential inconvenience; media and education targets widened the information environment; and Greenlandic targets added geopolitical weight.
In CSIS’ assessment, the election‑period campaign is best understood as influence‑oriented disruption.
“The technical objective was service degradation,” says Stefan Tanese, “but the strategic objective was to create the impression that Denmark was under pressure during a politically sensitive period.”
Why Greenland Became Central to DDoSIA’s Pressure on Denmark
During the election period, CSIS observed Greenlandic public and commercial hosts listed alongside Danish targets.
Greenlandic sovereignty was already an election subject, following statements from the United States. Consequently, by hitting Greenland‑related services as well as Danish institutions, DDoSIA’s campaign could exploit a politically sensitive issue.
In this way, DDoSIA’s activity was more than a general nuisance campaign. It tied DDoS attacks to a wider geopolitical storyline involving Arctic sovereignty, Western support for Ukraine, and put pressure on Denmark during a moment of domestic political attention.
Easter 2026: DDoSIA Shifts Toward Citizen Inconvenience
CSIS later detected a notable shift in target composition around Easter 2026, with the campaign expanding into areas more likely to affect ordinary users. These included transport-related services, airport and ticketing platforms, postal commerce, municipal websites, utility providers, and customer-facing portals.
Again, the timing matters. During a holiday period, people rely on transport information, booking systems, public self-service portals, postal services, payments, and local government information. Consequently, a temporary outage that might normally be dismissed as a nuisance can become more visible.
CSIS also observed a wider set of smaller and lower‑profile organisations in the Easter‑period targeting, including local electrical firms, niche energy providers, installers, municipal platforms, and specialised commercial services.
These smaller organisations may lack the DDoS‑mitigation maturity of national institutions, like banks and public‑sector bodies. Often, they depend on default hosting protections, limited web application monitoring, or unmanaged CMS deployments. Against that kind of target, even moderate application‑layer traffic can cause visible disruption.
The Easter campaign therefore appears to have traded some target prestige for breadth and public inconvenience.
From Broad Disruption to Financial and Specialist Targets
By early April 2026, CSIS observed a further refinement in DDoSIA’s tactics. After the broader Easter‑period activity, the campaign narrowed — targeting financial services, banking‑related infrastructure, and specialist energy or technical organisations.
It focused on high‑interaction, high‑cost endpoints such as login and authentication flows, password‑reset functions, search pages and API calls, checkout and cart functionality, booking and ticketing workflows, newsletter and contact forms, CMS administrative handlers, and dynamic AJAX or XML‑RPC endpoints.
This was significant. A bank’s homepage may be symbolic, but customer login, password recovery, search, and session‑oriented workflows are operationally sensitive.
This selection reinforces the assessment that DDoSIA was not only attempting to overwhelm website front pages. The campaign repeatedly targeted application functions that can generate back-end load and degrade service availability even when bandwidth is not fully saturated.
Analysis: What DDoSIA is trying to achieve in Denmark
CSIS assesses that the Denmark and Greenland campaigns support four overlapping objectives:
1. Political signalling. Denmark is a high‑value symbolic target because of its support for Ukraine, NATO alignment, and wider geopolitical role. Greenland adds further weight through Arctic‑security and sovereignty narratives.
2. Election‑period amplification. DDoS activity becomes more valuable when it coincides with elections. Even limited disruption can attract attention when public institutions are already under scrutiny.
3. Public inconvenience. The Easter campaign’s focus on transport, postal commerce, municipal, utility, tax, identity, and other customer‑facing services suggests an effort to affect ordinary users, not just national institutions.
4. Signalling the actor’s resilience. DDoSIA’s repeated campaign updates show that it can return at low cost, shift targeting quickly, and combine symbolic targets with practical citizen‑facing disruption.
Insight: Technically Unsophisticated Attacks Can Be Strategically Effective
The Denmark and Greenland campaigns have so far remained limited in direct technical impact. CSIS has not observed that DDoSIA compromised systems, stole data, or altered election processes.
But dismissing the activity as “just DDoS” misses the point.
DDoS is useful to hacktivist ecosystems because it is visible, repeatable, simple to claim, and easy to align with political narratives. It does not need to be technically sophisticated to be strategically effective. When directed at the right services at the right moment, temporary website disruption can support a broader influence effort.
In this way, public-facing digital resilience is now part of geopolitical resilience.
Defensive Priorities for Organisations Facing DDoSIA‑Style Campaigns
As the operations against Denmark and Greenland showed, organisations should assume that DDoSIA or similar actors will attack during future political, military, diplomatic, or cultural moments. The most exposed are those with public‑facing services, citizen portals, political visibility, transport or logistics functions, financial access points, utility services, or links to sensitive geopolitical issues.
Recommended defensive priorities:
- Prioritise high-cost application paths. Login, password reset, search, checkout, booking, contact, CMS, API, AJAX, and XML-RPC endpoints should receive stricter rate limits and bot controls than static content.
- Use L7-capable mitigation. Organizations should ensure that DDoS protection is not limited to volumetric traffic scrubbing. Application-layer attacks require behavioural analysis, request fingerprinting, challenge mechanisms, session-aware filtering, and path-specific controls.
- Place public websites behind reverse-proxy, CDN, and WAF protections. For smaller organizations, even basic CDN and WAF services can materially improve resilience by absorbing traffic, caching content, and enabling simple firewall rules.
- Cache aggressively when possible. Static and semi-static pages should be cached to reduce back-end load during traffic spikes.
- Harden CMS exposure. WordPress and other CMS platforms should restrict administrative endpoints, disable unnecessary XML-RPC functionality, review plugin exposure, and enforce strong authentication controls.
- Prepare communications in advance. Since reputational effect is central to these campaigns, public messaging should be part of DDoS response planning. Organisations should be ready to explain temporary disruption clearly and avoid overstating impact.
Preparing for the Next Wave of DDoSIA‑Style Campaigns
DDoSIA’s campaigns against Denmark and Greenland show how relatively unsophisticated DDoS activity can be used as strategic pressure: repeated, opportunistic disruption against a widening set of organisations that may not think of themselves as geopolitical targets.
This persistence is especially important given the actor’s resilience. In July 2025, Operation Eastwood, coordinated by Europol and Eurojust, disrupted NoName057(16) infrastructure, led to arrests and warrants, and targeted more than 100 servers used by the network. Despite that, NoName057(16) and DDoSIA activity continued, underscoring the low-cost and recoverable nature of the operating model.
For organisations with public‑facing digital services, the implication is clear: treating DDoS as a solved, purely technical problem is no longer enough. It is now part of a broader resilience and reputational challenge.
How CSIS Can Help
CSIS continues to track DDoSIA and related pro‑Russian hacktivist campaigns across Europe. Our work combines technical telemetry, open‑source analysis of hacktivist ecosystems, and geopolitical assessment to help organisations:
- understand how campaigns like DDoSIA fit into wider state and proxy strategies;
- identify which of their public‑facing services are most likely to be targeted; and
- prioritise concrete improvements in DDoS mitigation, monitoring, and incident communications.
If your organisation operates critical or citizen‑facing digital services and wants to stress‑test its preparedness for DDoSIA‑style activity, CSIS can support with tailored threat briefings, scenario‑based exercises, and advisory work on defensive priorities. The campaigns are likely to continue — now is the time to ensure resilience.
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