# Ruby Sleet: threat group profile

> Ruby Sleet is a threat group thought to operate from North Korea. Public reporting about it is still limited. This free profile brings together what is known about it, so you can judge the risk to you. It lists the other names the group goes by and links to every public report behind it.

Canonical page: https://www.edgeprotect.io/threat-actors/ruby-sleet
Breadcrumb: [Home](https://www.edgeprotect.io/) > [Threat groups](https://www.edgeprotect.io/threat-actors) > Ruby Sleet

## At a glance

| Fact | Value |
|---|---|
| Attack techniques | 0 |
| Thought to operate from | North Korea |
| Other names | 1 |
| Public reports | 1 |

## Who is Ruby Sleet?

Ruby Sleet is a threat group thought to operate from North Korea. Public reporting about it is still limited.

### Also known as

CERIUM

Security companies each give the same group their own name, so one group can have many.

### What public reporting says

> Ruby Sleet is a threat actor linked to North Korea's Ministry of State Security. Cerium has been involved in spear-phishing campaigns, compromising devices, and conducting cyberattacks alongside other North Korean threat actors. They have also targeted companies involved in COVID-19 research and vaccine development.

## Public reports about Ruby Sleet

- https://blogs.microsoft.com/on-the-issues/2020/11/13/health-care-cyberattacks-covid-19-paris-peace-forum/

## Frequently asked questions

### Who is Ruby Sleet?

Ruby Sleet is a threat group thought to operate from North Korea. Public reporting about it is still limited.

### Where is Ruby Sleet thought to be based?

Public reporting places Ruby Sleet as operating from North Korea. Attribution is never certain: it rests on the tools, infrastructure and targets researchers have seen.

### How do I know if Ruby Sleet is a risk to my business?

Create an account and tell us the software you run. We match it against known flaws, including those linked to threat groups, rank each one from 0 to 100 and tell you as soon as we spot something that affects you.

## Check whether it matters to your business

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