ZeffSec Hacktivists Claim Massive Cyber-Attack on Iran's ArvanCloud Infrastructure

TEHRAN, Iran - March 13, 2026 - PRLog -- Digital infrastructure across Iran faced a severe bottleneck early this morning as a wave of targeted cyber-attacks hit ArvanCloud, the nation's primary cloud and CDN provider. The hacktivist group ZeffSec (Zeff Security) has officially claimed responsibility for the operation, which has caused widespread service failures, most notably on the online education platform Skyroom.

The disruption began at approximately 3:00 AM local time, with users nationwide reporting persistent 504 Gateway Timeout errors. Unlike typical website defacements, this attack targeted the "edge nodes" of the ArvanCloud network. By overwhelming these entry points with high-volume malicious traffic, ZeffSec effectively paralyzed all businesses and services sitting behind the ArvanCloud firewall, triggering a digital standstill for thousands of users.

The impact was felt immediately in the educational and corporate sectors. Skyroom, a backbone for virtual classrooms and business meetings in the region, saw its services collapse just as morning sessions were scheduled to begin. Simultaneously, other similar websites became inaccessible, stalling the release of corporate news and public announcements.

ZeffSec announced the successful breach via their official Telegram channel, mocking the resilience of the domestic "National Internet" infrastructure. In their statement, the group described the outage as a "clear view of the fog," referencing ArvanCloud's name (Abr Arvan, meaning "Arvan Cloud"). The group emphasized that their objective was the disruption of centralized infrastructure rather than the theft of individual user data.

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About ZeffSec: ZeffSec is an independent hacktivist collective focused on infrastructure-level disruption and exposing vulnerabilities in centralized digital networks. The group is known for high-visibility operations designed to demonstrate the fragility of modern web defenses.