Bottom line: Tightened war exclusion clauses in cyber policies are forcing companies to forensically rule out state involvement in attacks in order not to lose their insurance coverage.
Since 2026, insurers have tightened their war exclusion clauses and now explicitly exclude state-sponsored cyber operations from coverage as well. In the event of a claim, affected companies must use digital forensics to prove that an attack was of civilian-criminal rather than state origin.
Reinsurers and primary insurers fundamentally revised their war clauses in cyber insurance policies in 2026. The starting point for this development was the NotPetya incident, which triggered years of legal disputes between major corporations and their insurers. The new clauses are no longer limited to classic, kinetic acts of war but explicitly also exclude state-directed, state-sponsored or state-coordinated cyber operations from coverage.
For affected companies, this significantly raises the burden of proof in the event of a claim. If ransomware causes widespread encryption of infrastructure, a legal review process by the insurer runs in parallel with the technical recovery effort. If the insurer argues that the incident stems from a state-commissioned advanced persistent threat group, the company risks the complete loss of its insurance coverage. Given that damage amounts in cases of global production outages regularly reach double-digit millions, the economic survival of the company thus hinges on forensically sound proof that the attackers’ motivation was purely criminal.
Attributing an attack to a specific actor (attribution) is one of the most complex tasks in digital forensics. Attackers routinely rely on false flags: criminal groups deliberately use malware code fragments, variable names or metadata typically attributed to state actors in order to lead investigators down the wrong path. The problem is compounded by the fact that the boundaries between organized, financially motivated cybercrime and state actors are increasingly blurring — under the ransomware-as-a-service model, state actors rent the infrastructure and malware of criminal networks to disguise their own espionage or sabotage operations. Insurers often base their refusal of coverage on public attributions by intelligence services or security agencies to a nation-state; companies must counter this with their own tamper-proof telemetry data and forensic reports.
This burden-of-proof dilemma creates a structural requirement for CISOs: digital forensics must be institutionalized long before an incident occurs, since after-the-fact reconstruction from fragmented server logs generally fails. Technical documentation should conform to international standards for digital forensics, in particular ISO/IEC 27037, to ensure an unbroken chain of custody. The evidentiary architecture rests on several technological pillars, the first of which is immutable logging — the source does not elaborate further on the remaining details.
Source: www.it-daily.net · Published August 16, 2026
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