# UNC4841: threat group profile

> UNC4841 is a threat group thought to operate from China. 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/unc4841
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## At a glance

| Fact | Value |
|---|---|
| Attack techniques | 0 |
| Thought to operate from | China |
| Other names | 1 |
| Public reports | 15 |

## Who is UNC4841?

UNC4841 is a threat group thought to operate from China. Public reporting about it is still limited.

### Also known as

SLIME57

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

### What public reporting says

> UNC4841 is a well-resourced threat actor that has utilized a wide range of malware and purpose-built tooling to enable their global espionage operations. They have been observed selectively deploying specific malware families at high priority targets, with SKIPJACK being the most widely deployed. UNC4841 primarily targeted government and technology organizations, but they have also been observed targeting other verticals.

## Public reports about UNC4841

- https://cloud.google.com/blog/topics/threat-intelligence/unc4841-post-barracuda-zero-day-remediation/
- https://cloud.google.com/blog/topics/threat-intelligence/barracuda-esg-exploited-globally/
- https://i.blackhat.com/Asia-24/Presentations/Asia-24-Chen-Chinese-APT.pdf
- https://www.youtube.com/watch?v=PSaix1C-UMI
- https://www.youtube.com/watch?v=4zaStuUdvrE
- https://sansorg.egnyte.com/dd/8ekLJCPHPj/
- https://www.cisa.gov/sites/default/files/2023-07/MAR-10454006.r3.v1.CLEAR_.pdf
- https://www.cisa.gov/sites/default/files/2023-07/MAR-10454006.r2.v1.CLEAR_.pdf
- https://www.cisa.gov/sites/default/files/2023-07/MAR-10454006.r1.v2.CLEAR_.pdf
- https://www.cisa.gov/sites/default/files/2023-08/MAR-10459736.r1.v1.CLEAR_.pdf
- https://www.cisa.gov/sites/default/files/2023-08/MAR-10454006.r4.v2.CLEAR_.pdf
- https://www.cisa.gov/sites/default/files/2023-09/MAR-10454006.r5.v1.CLEAR__0.pdf
- https://www.barracuda.com/company/legal/esg-vulnerability
- https://mandiant.widen.net/s/qwlxddwdg6/barracuda-cve-2023-2868-hardening
- https://jsac.jpcert.or.jp/archive/2025/pdf/JSAC2025_1_5_leon-chang_theo-chen_en.pdf

## Frequently asked questions

### Who is UNC4841?

UNC4841 is a threat group thought to operate from China. Public reporting about it is still limited.

### Where is UNC4841 thought to be based?

Public reporting places UNC4841 as operating from China. Attribution is never certain: it rests on the tools, infrastructure and targets researchers have seen.

### How do I know if UNC4841 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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