Skip to content
Auto-CTI
Back to all actors

Sapphire Sleet

Nation-state North Korea Dormant
Mentions
1
First seen
18 Jun 2026
Last seen
18 Jun 2026

Relevant to you ยท Relevant

Threat focus:
supply chainespionage / apt

Origin

North Korea

Profile

Sapphire Sleet is a threat actor group recently involved in a supply chain attack on the npm package 'Mastra'. The attackers compromised the package and inserted a malicious postinstall payload that executes upon installation. The exact targets and malware details remain unclear. The incident highlights the risks of supply chain attacks in the software development lifecycle.

Affected vendors

Npm

Targeted sectors

Software development

Activity (8 weeks)

22
23
24
25
26
27
28
29

Recent activity

ESC

โ€ฆ