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Gray Sandstorm, also tracked by Microsoft as DEV-0343 during its developmental clustering phase, is an Iran-linked threat activity cluster assessed to support Iranian government intelligence requirements. The actor was observed beginning in mid-2021 conducting large-scale password-spraying operations against Microsoft 365 and Office 365 environments. Its targeting focused on U.S. and Israeli defense technology companies, geographic information systems and spatial analytics organizations, Persian Gulf ports of entry, and maritime and cargo transportation companies with business exposure in the Middle East. Reported victimology also included defense-sector organizations supporting U.S., European, and Israeli government partners, including firms associated with radar, drone, satellite, and emergency communications technologies. The cluster’s operations are characterized by broad credential attacks rather than bespoke malware-heavy intrusions. It targeted Exchange ActiveSync and Autodiscover services to validate accounts and passwords, repeatedly enumerated large numbers of accounts, and used anonymized infrastructure to obscure origin and distribute authentication attempts. Observed tradecraft included browser emulation and tooling similar to publicly known Office 365 password-spraying frameworks. The activity pattern, sectoral focus, and operational timing have been assessed as consistent with Iranian state-aligned operations. Gray Sandstorm’s known behavior indicates a primary emphasis on initial access through credential attacks and follow-on intelligence collection opportunities rather than disruptive or extortion-driven operations. The targeting of maritime transportation, ports, satellite-related firms, and defense technology aligns with strategic intelligence priorities relevant to regional security, shipping awareness, and adversary monitoring in the Middle East.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
4 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.