Unpacking the MOVEit Breach: Statistics and Analysis

MOVEit attacks Statistics and Analysis

MOVEit is a file transfer platform made by Progress Software Corporation. The platform is used by thousands of governments, financial institutions and other public and private sector bodies all around the world to send and receive information.

In late May 2023, data started to be transferred from hundreds of MOVEit deployments, however, these were not normal file transfers initiated by legitimate users. MOVEit had been hacked and the data was being stolen by a ransomware operation called Cl0p.

The current tally of organizations and individuals known to have been impacted by this incident is shown below. The data is sourced from state breach notifications, SEC filings, other public disclosures, as well as Cl0p’s website, and is current as of April 18, 2024.

Organizations: 2,770
Individuals: 94,944,377

The MOVEit breaches to have impacted the most individuals are:

Organization Individuals
Maximus 11.3 million
Welltok 10 million
Delta Dental of California and affiliates 6.9 million
Louisiana Office of Motor Vehicles 6 million
Alogent 4.5 million
Colorado Department of Health Care Policy and Financing 4 million
Oregon Department of Transportation 3.5 million
BORN Ontario 3.4 million
Gen Digital (Avast) 3 million
Teachers Insurance and Annuity Association of America 2.6 million
Genworth 2.5 million
Arietis Health 1.9 million
PH Tech 1.7 million
NASCO 1.6 million
State of Maine 1.3 million
Milliman Solutions 1.3 million
Nuance Communications 1.2 million
Wilton Reassurance Company 1.2 million

U.S.-based organizations account for 78.9 percent of known victims, Canada-based 13.5 percent, Germany-based 1.3 percent, and U.K.-based 0.7 percent.

The most heavily impacted sectors are education (39.1 percent), health (20.1 percent), and finance and professional services (13.3 percent).

While it is impossible to accurately calculate the cost of the MOVEit incident, it is possible to illustrate the potential cost. According to IBM, data breaches cost an average of $165 USD per record. Based on the numbers of individuals confirmed to have been impacted, that puts the cost of the MOVEit incident at $15,665,822,205.

Some of the organizations impacted provide services to multiple other organizations, and so the numbers above are likely to increase significantly as those organizations start to file notifications.

It should be noted that there will be some overlap in terms of individuals impacted. With so many organizations affected, it is inevitable that some individuals will have been affected more than once, and we have no way to account for this.

How did it happen?

On May 31st, Progress Software issued an advisory and patch for a vulnerability subsequently identified as CVE-2023-34362 and assigned a severity rating of 9.8 out of 10. The company stated the vulnerability “could lead to escalated privileges and potential unauthorized access to the environment.” In other words, it was a vulnerability which could enable hackers to access MOVEit and steal data – something which it later emerged had been happening since at least May 27th.

On June 9th, Progress issued a patch for a second vulnerability identified as CVE-2023-35036. On June 15th, patch was issued for a third vulnerability identified as CVE-2023-35708. Both vulnerabilities were critical and could have enabled the MOVEit platform to be further exploited.

Cl0p confirmed that it had been responsible for the attack on the MOVEit platform with the below June 6th post on the group’s site on the dark web.

Cl0p's post

As shown in the above screenshot, Cl0p stated that the data which had been stolen from governments, cities and police services had been deleted. On July 17th, 2023, that claim was proven to be inaccurate when the group listed the UK’s Office of Communications (Ofcom) and Ireland’s Commission for Communications Regulation (Comreg).


The upstream/downstream in many MOVEit incidents is extremely complex, with some organizations being impacted because they used a vendor which used a contractor which used a subcontractor which used MOVEit. Additionally, some organizations have had MOVEit exposure via multiple vendors. This is especially true in the education sector with some institutions being affected by incidents involving the National Student Clearinghouse, the Teachers Insurance and Annuity Association of America-College Retirement Equities Fund (which was impacted by an incident at a vendor: PBI Research Services), as well as third party health insurance providers and other financial service providers.

Who is Cl0p?

Cl0p is a type of ransomware that has been used in cyberattacks since 2019. Data stolen in the attacks is published to a site on the dark web – a so-called “data leak site” or “DLS” –  which the hackers refer to as “CL0P^_- LEAKS.” The ransomware and website have been linked to FIN11, a financially-motivated cybercrime operation which has been connected to both Russia and Ukraine and which is believed to be part of a larger umbrella operation known as TA505.

While the actors behind Cl0p have previously deployed file-encrypting ransomware, they have increasingly switched to a smash-and-grab, exfiltration-only strategy, relying on the threat of releasing stolen data as leverage to extort payment. This is likely so that Cl0p can quickly exfiltrate data from as many organizations as possible, before the vulnerability being exploited is patched.

This is not the first time the group has attacked a file transfer platform. MOVEit-like attacks were launched against Accellion File Transfer Appliances (FTA) in 2020/2021, SolarWinds Serv-U in 2021, and Fortra/Linoma GoAnywhere MFT servers in 2023.

Looking forward

The MOVEit incident highlights the challenges organizations face in securing their data. It’s not only their own security they need to be concerned about, it’s the security of their supply chains too. Complicating matters further is the fact that attacks which leverage zero-day vulnerabilities, as this one did, are extremely hard to defend against.

The incident will undoubtedly be extremely costly. Beyond remediation, organizations and their insurers will need to provide credit monitoring to individuals and will undoubtedly face multiple lawsuits. Additionally, there is significant potential for the stolen data to be used in spear phishing, BEC scams, etc., meaning that this one crime could act as an enabler for many other crimes.

The most important question is how we can stop a similar event from happening again. While that is not an easy question to answer, Secure by Design, Secure by Default initiatives could play a critical role.

The bottom line is that organizations cannot be expected to fend off attacks against vulnerable software, and so it needs to be made more secure. Unless we can improve the security of software, it is only a matter of time before there is another MOVEit-like incident.

Zach Simas

Zach Simas

Zach is a multifaceted writer, specializing in finance, tech, and now broadening his expertise into the cybersecurity domain. When he’s not writing — Zach expresses his creativity through music as a singer, bassist, and producer.

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