ZeffSec is a hacktivist collective known for large-scale DDoS attacks aimed at disrupting centralized digital infrastructure.
Analyst brief
ZeffSec, also known as Zeff Security, is a hacktivist collective focused on disrupting centralized digital infrastructure. The group primarily targets cloud and CDN providers like Iran's ArvanCloud, leading to widespread service outages across dependent platforms. Their primary TTP is large-scale DDoS attacks, usually announced via Telegram, with the stated goal of infrastructure-level disruption rather than data theft. Defenders should focus on robust DDoS mitigation strategies and redundant network architecture for critical services.
ZeffSec
Zeff Security
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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.