857 Ransomware Victims in September 2026 Across 82 Groups

Atlas data tracked by Brandefense counts 857 ransomware victims from 82 active groups in September 2026. For anyone who is not a security professional, a number like that can feel abstract. But each entry on a leak site is an organization that holds data about real people: customers, patients, students, employees. Looking at the ransomware victims September 2026 figures helps explain why your personal information can end up exposed even when you did nothing wrong.

September 2026 Ransomware by the Numbers

The headline figures from the report are simple. Across the month, 857 organizations were listed as victims, and those listings were attributed to 82 different groups. That works out to an average of roughly 29 new victims per day, based on a 30-day month (this is our own arithmetic, not a figure from the report).

The number of groups is arguably as important as the victim count. With 82 groups active in a single month, the ecosystem is crowded and fragmented. Takedowns and arrests do not stop the activity overall, because new brands appear and affiliates move between them. The source also notes what October has added so far, which suggests the pace has not paused going into the new month.

One caution applies to all leak-site statistics: they only capture victims that attackers chose to publish. Organizations that paid quietly, restored from backups, or were never listed will not appear in these counts. Treat the total as a floor, not a complete picture.

Which Groups, Sectors and Countries Were Hit Hardest

The Atlas data breaks the month down by group, sector and country. We are not reproducing the detailed rankings here, so readers who want the exact ordering should consult the original Brandefense report. What the breakdown format makes clear is that ransomware is not confined to one industry or region. Healthcare, education, manufacturing, professional services and local government all appear regularly in this kind of tracking, and the same is true of countries well beyond the largest economies.

The group landscape also keeps shifting. Newer operators have been emerging alongside established ones. For example, a new extortion group called N0n surfaced in September and claims dozens of victims, as covered in our report on how N0n ransomware emerged in September 2026. Another actor, GSG, has built a public leak site without any evidence yet that it encrypts files, which we examined in our piece on GSG as a data-theft extortion group that skips ransomware.

That second point matters. Many modern "ransomware" incidents are really data-theft extortion. Encryption may or may not happen, but the threat to publish stolen data is the real leverage.

How These Attacks Expose Consumer Personal Data

When a company appears on a leak site, the attackers usually claim to have copied files before locking systems. Those files can include names, email addresses, phone numbers, home addresses, account details, and in some sectors medical or financial records. If the victim refuses to pay, the data may be posted publicly or sold.

For individuals, the downstream risks are practical rather than dramatic:

• Targeted phishing: Leaked contact details and account context make scam messages far more convincing.
• Credential reuse attacks: If a password was exposed and you reused it elsewhere, other accounts become vulnerable.
• Identity fraud: Combined personal details can be used to open accounts or answer security questions.

Law enforcement pressure does sometimes disrupt this pipeline. On 30 September 2026, authorities took control of KillSec's leak site and secured at least 110 terabytes of data, as detailed in our coverage of the KillSec ransomware leak site seizure. Actions like this limit further unauthorized access, but they do not erase the risk from the many other groups still operating.

What This Means For You

You cannot control whether a company you do business with gets breached. You can control how much damage a leak does to you. The goal is to make exposed data less useful to criminals.

Use multi-factor authentication (MFA). Turn it on for email, banking, cloud storage and social accounts. An app-based authenticator or a hardware security key is stronger than SMS codes. Even if a leaked password is tried against your account, MFA can stop the login.

Use unique passwords. A password manager makes this realistic. If one organization is breached, a unique password means the exposure stays contained.

Keep backups of your own files. Ransomware is not only a corporate problem. Follow a simple routine: keep at least one copy of important files offline or in a separate account that is not constantly connected to your device, and test that you can restore from it.

Treat unexpected messages with suspicion. After a breach, expect follow-up scams that reference real services you use. Do not click links in messages claiming there is a problem with your account. Go to the official site or app directly instead.

Keep software updated. Attackers combine vulnerabilities to break in, a pattern we saw in our report on a Chrome zero-day chain that escaped the browser sandbox. Prompt updates close those doors.

Watch for breach notifications. If an organization tells you your data was involved, take it seriously. Change the relevant passwords, review account activity, and consider placing a fraud alert or credit freeze where available in your country.

Key Takeaways

The ransomware victims September 2026 total of 857 across 82 groups shows that this activity is steady, broad and constantly evolving. Individuals rarely appear on these lists themselves, but their data often sits inside the organizations that do.

• Enable MFA on every important account, starting with email.
• Use a unique password for each service.
• Maintain tested backups of your personal files.
• Be skeptical of unsolicited messages, especially after a known breach.
• Keep your devices and browsers updated.

For more context on the current threat picture, read our coverage of the new extortion groups N0n and GSG, and the KillSec takedown. A few minutes spent hardening your accounts today is the most reliable defense you have against the fallout from someone else's breach.