Moonstone Sleet
aka Storm-1789
A North Korean group named by Microsoft in 2024 that approaches targets through fake companies, games and job offers. In 2025 it began deploying another gang's ransomware.
- Alert level
- 1/ 5
- Reports & advisories (90 days)
- 0
- Known exploited CVEs
- 0
- Personal data leaked (disclosed)
- None confirmed
Attribution
- North Korean-linked threat actor — MITRE ATT&CK
- Assessed as North Korean state-aligned — Microsoft
How they attack
Entry
Fake companies and games
Like setting up a convincing fake studio and asking people to try a 'beta game' that hides a trap.
Entry
Fake job offers and interviews
Like a recruiter with a dream job who asks you to open a 'test assignment' that is actually booby-trapped.
Goal
Ransomware extortion
Like padlocking a warehouse and demanding money for the key.
Sources
Attributions are quoted as assessed by governments and security vendors. VulnPulse does not make attributions itself.
Leak counts only add up figures disclosed by the affected companies or authorities, never the attackers' own claims. We do not list victim names or link to leak sites.
The alert level is calculated automatically from reports and advisories in the last 90 days, known exploited vulnerabilities, and whether the group has targeted Japan.
Updated 2026-10-23 · daily