ZeffSec
Intelligence Profile
ZeffSec is a hacktivist collective focused on infrastructure-level disruption and exposing vulnerabilities in centralized digital networks. In March 2026, the group claimed responsibility for a large-scale DDoS attack against ArvanCloud, Iran's primary cloud and CDN provider, causing widespread service outages across platforms including the online education service Skyroom. The group announced the operation via Telegram, stating their goal was disruption of centralized infrastructure rather than data theft.
Threat Analysis
ZeffSec is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of hacktivism.
As a hacktivist-aligned entity, ZeffSec conducts operations driven by ideological, political, or social grievances, typically through website defacements, DDoS attacks, and the leaking of sensitive data to advance a public narrative.