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# Threat Brief: Kaseya VSA Ransomware Attack

![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 2 min read  
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  Published:July 3, 2021

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  * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/)
  * [Ransomware](https://unit42.paloaltonetworks.com/category/ransomware/)

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  * [Kaseya](https://unit42.paloaltonetworks.com/tag/kaseya/)
  * [REvil](https://unit42.paloaltonetworks.com/tag/revil/)

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## Executive Summary

On July 2, attackers reportedly launched attacks against users of the Kaseya VSA remote monitoring and management software as well as customers of multiple managed service providers (MSPs) that use the software. They used access to the VSA software to deploy ransomware associated with the REvil/Sodinokibi ransomware-as-a-service group, according to reports. Kaseya has stated that the attack was conducted by [exploiting a vulnerability in its software](https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689), and said they are working on a patch. The company has not released further information on the vulnerability. Kaseya [recommends](https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689)that any organization using VSA shut the system down immediately. CISA has also issued a [bulletin](https://us-cert.cisa.gov/ncas/current-activity/2021/07/02/kaseya-vsa-supply-chain-ransomware-attack) asking organizations using the software to follow Kaseya guidance.

The full extent of the attack is currently unknown. Kaseya states that [fewer than 40](https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689) of its customers are impacted. If those customers include MSPs, many more organizations could have been attacked with the ransomware. Kaseya VSA's functionality allows administrators to remotely manage systems. If an MSP's VSA system was compromised, that could allow an attacker to deploy malware into multiple networks managed by that MSP.

There has been much speculation about the nature of this attack on social media and other forums. We have not been able to independently determine how these attacks were conducted.

[Multiple](https://doublepulsar.com/kaseya-supply-chain-attack-delivers-mass-ransomware-event-to-us-companies-76e4ec6ec64b)[sources](https://www.reddit.com/r/msp/comments/ocggbv/crticial_ransomware_incident_in_progress/) have stated that the following three files were used to install and execute the ransomware attack on Windows systems:

agent.exe | d55f983c994caa160ec63a59f6b4250fe67fb3e8c43a388aec60a4a6978e9f1e  
mpsvc.dll | e2a24ab94f865caeacdf2c3ad015f31f23008ac6db8312c2cbfb32e4a5466ea2  
mpsvc.dll | 8dd620d9aeb35960bb766458c8890ede987c33d239cf730f93fe49d90ae759dd

Palo Alto Networks [WildFire](https://www.paloaltonetworks.com/products/secure-the-network/wildfire), [Threat Prevention](https://www.paloaltonetworks.com/products/secure-the-network/subscriptions/threat-prevention) and [Cortex XDR](https://www.paloaltonetworks.com/cortex/cortex-xdr) detect and prevent REvil ransomware infections.

As more information becomes available on the nature of this attack, we will update this brief to provide additional details.

## Indicators of Compromise

#### **Kaseya Connected REvil Executables**

d55f983c994caa160ec63a59f6b4250fe67fb3e8c43a388aec60a4a6978e9f1e  
8dd620d9aeb35960bb766458c8890ede987c33d239cf730f93fe49d90ae759dd  
e2a24ab94f865caeacdf2c3ad015f31f23008ac6db8312c2cbfb32e4a5466ea2

#### **Kaseya-provided** **IOCs** **are below** :

Source: [Incident Overview and Technical Details, Kaseya](https://helpdesk.kaseya.com/hc/en-gb/articles/4403584098961)

35\.226.94\[.\]113  
161\.35.239\[.\]148  
162\.253.124\[.\]162

#### **Web log IOCs**

POST /dl.asp curl/7.69.1  
GET /done.asp curl/7.69.1  
POST /cgi-bin/KUpload.dll curl/7.69.1  
GET /done.asp curl/7.69.1  
POST /cgi-bin/KUpload.dll curl/7.69.1  
POST /userFilterTableRpt.asp curl/7.69.1

## Additional Resources

[Understanding REvil: The Ransomware Gang Behind the Kaseya Attack](https://unit42.paloaltonetworks.com/revil-threat-actors/)

[Threat Assessment: GandCrab and REvil Ransomware](https://unit42.paloaltonetworks.com/ransomware-threat-assessments/7/)

[2021 Unit 42 Ransomware Threat Report](https://start.paloaltonetworks.com/unit-42-ransomware-threat-report)

[Breaking Down Ransomware Attacks](https://unit42.paloaltonetworks.com/breaking-down-ransomware-attacks/)

[Ransomware's New Trend: Exfiltration and Extortion](https://www.paloaltonetworks.com/resources/whitepapers/ransomwares-new-trend-exfiltration-and-extortion)

*Updated July 6, 2021, at 3:06 p.m. PT.*
Back to top

### Tags

* [Kaseya](https://unit42.paloaltonetworks.com/tag/kaseya/ "Kaseya")
* [REvil](https://unit42.paloaltonetworks.com/tag/revil/ "REvil")  
  [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Network Attack Trends: February-April 2021](https://unit42.paloaltonetworks.com/network-attack-trends-february-april-2021/ "Network Attack Trends: February-April 2021")

### Table of Contents

* 

### Related Articles

* [Ransom Cartel Ransomware: A Possible Connection With REvil](https://unit42.paloaltonetworks.com/ransom-cartel-ransomware/ "article - table of contents")
* [Understanding REvil: REvil Threat Actors May Have Returned (Updated)](https://unit42.paloaltonetworks.com/revil-threat-actors/ "article - table of contents")
* [Prometheus Ransomware Gang: A Group of REvil?](https://unit42.paloaltonetworks.com/prometheus-ransomware/ "article - table of contents")

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