# Silent Chollima: threat group profile

> Silent Chollima 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.

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## At a glance

| Fact | Value |
|---|---|
| Attack techniques | 0 |
| Thought to operate from | North Korea |
| Other names | 8 |
| Public reports | 2 |

## Who is Silent Chollima?

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

### Also known as

OperationTroy, Guardian of Peace, GOP, WHOis Team, Andariel, Subgroup: Andariel, Onyx Sleet, PLUTONIUM

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

### What public reporting says

> Andariel is a threat actor that primarily targets South Korean corporations and institutions. They are believed to collaborate with or operate as a subsidiary organization of the Lazarus threat group. WHOIS utilizes spear phishing attacks, watering hole attacks, and supply chain attacks for initial access. They have been known to exploit vulnerabilities and use malware such as Infostealer and TigerRAT.

## Public reports about Silent Chollima

- https://docs.huihoo.com/rsaconference/usa-2014/anf-t07b-the-art-of-attribution-identifying-and-pursuing-your-cyber-adversaries-final.pdf
- https://www.microsoft.com/en-us/security/blog/2023/10/18/multiple-north-korean-threat-actors-exploiting-the-teamcity-cve-2023-42793-vulnerability/

## Frequently asked questions

### Who is Silent Chollima?

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

### Where is Silent Chollima thought to be based?

Public reporting places Silent Chollima 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 Silent Chollima 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.

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