Bad Rabbit Ransomware: How the Fake Flash Update Turned Into a Real Attack

The story of Bad Rabbit ransomware still matters because it showed how fast a solid-looking fake update can turn into a serious attack. This was not one of those cartoonishly obvious scams with broken English and flashing red warnings. It looked like normal software, used real websites as bait, and then moved deeper into a network once the first machine got hit.

In this guide, we’ll break down what Bad Rabbit was, how the Bad Rabbit infection worked, what the technical details tell us, and what regular people and teams can learn from it today. We’ll also show how VeePN can add another layer of protection against the kinds of risky conditions that help ransomware attacks spread.

Oliver Bennett

Mar 2, 2026

10 min read

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What bad Rabbit Ransomware as and why people still talk about it

At its core, Bad Rabbit ransomware was a new ransomware campaign first widely reported on October 24, 2017. Early initial reports linked it to disruptions in Eastern Europe, especially in Russia and Ukraine. Researchers and public reports tied the incident to victims including Russian media outlets, Odessa International Airport, and Kyiv Metro, which is why the case got attention far beyond the security world.

What made Rabbit ransomware stand out was not just the damage. It was the method. Instead of blasting the internet at random, the attackers used compromised websites and pushed a fake Adobe Flash update. That turned browsing into the first step of the infection chain. In other words, the user often did the last click that let the malware gain access.

That detail matters because people often imagine ransomware as something that appears out of nowhere. In reality, many attacks begin with ordinary behavior. Someone visits a familiar page, downloads what looks like a routine installer, and launches an executable. With Bad Rabbit, that was enough to set everything in motion on affected Windows operating systems.

How Bad Rabbit spread through compromised websites

This is where the story becomes very practical. Bad Rabbit was distributed through watering hole attacks, also called drive by attacks or drive by downloads. The idea is simple. Attackers tamper with sites people already trust, then wait for visitors to do the rest. Kaspersky said the compromised websites they saw were news or media pages, which made the lure more believable.

The fake Adobe Flash update trap

The first lure was a fake installer. Researchers found that the malware pretended to be an Adobe Flash installer and was delivered as a fake Adobe Flash update or fake Flash installer. That was a smart social-engineering move for 2017, when many people were still used to seeing Flash prompts and clicking them without much thought.

This is a good reminder that not every big cyber incident starts with some rare zero-day drama. Sometimes the method is painfully ordinary. A familiar pop-up appears, the file looks routine, and the victim runs an exe without realizing the page or the download source has been compromised. That one action is enough to start the Bad Rabbit infection on the victim’s machine.

Why real websites made the scam work

The campaign worked better because the attackers did not need to build trust from scratch. The trust was already there. If a person lands on a known media page and sees what seems like a normal update, their guard drops. That is one reason compromised websites are such a big problem in modern ransomware attacks.

Mandiant, then FireEye, also found overlap between Bad Rabbit redirect sites and infrastructure linked to a profiling tool called BACKSWING. That does not prove a full attribution on its own, but it does suggest the campaign was not some sloppy one-off. It looked coordinated, selective, and designed to target the right visitors.

That is also why this case still feels relevant now. The brand name may be old, but the playbook is not. Fake updates, booby-trapped pages, malicious redirects, and trusted sites turned into delivery platforms are still very real threats today. You can see the same pattern in VeePN’s guides on phishing sites.

Technical details of Bad Rabbit: what happened after the click

Once the fake installer was run, Bad Rabbit ransomware moved from social engineering to system-level damage. This part is where the technical details matter, even if you are not a malware analyst. They help explain why one bad click can turn into a much wider business problem.

It dropped files, created a scheduled task, and prepared encryption

Researchers found the malware dropped components into the C Windows area, including files such as C Windows infpub.dat and C Windows cscc.dat, then used them to create a scheduled task and continue execution. Talos and Kaspersky both described this stage as part of the launcher and encryption chain, with the malicious exe process eventually running dispci.exe as part of the attack flow.

That may sound very technical, but the takeaway is simple. Bad Rabbit did not just lock a few random documents and stop there. It planted multiple pieces, set up persistence, and prepared the system for both disk-level and file-level encryption. That is why infected computers could become effectively unusable in a short amount of time.

It used credentials and network movement to spread

After the first infection, the malware tried to spread inside the local network. Researchers saw it using Server Message Block traffic, brute-forcing NTLM passwords, and leveraging Windows admin features like WMI and remote service control. Kaspersky also reported use of the EternalRomance exploit, which was part of the leaked Shadow Brokers toolset tied to MS17-010-style SMB abuse.

This is what turns a single bad click into an organizational problem. One infected endpoint can become a launching point for network shares, remote systems, and other reachable machines. If the environment is flat, passwords are weak, and SMB is too open, the malware gets far more room to move.

It encrypted both the disk and selected files

Talos reported that Bad Rabbit used DiskCryptor for full-disk encryption and also encrypted individual files from a long list of targeted file extensions. Kaspersky said the malware used the attackers’ public key, specifically an RSA-2048 public key, to lock data. That is important because it meant victims generally could not just guess a decryption key and move on.

Kaspersky’s analysis was blunt: there was no practical way to decrypt the disk and victim files without the attackers’ private key. The one bit of good news was that Bad Rabbit did not delete shadow copies, which gave some victims a recovery path if conditions were right and full-disk encryption did not fully complete. That is one more reason good backup habits matter so much with ransomware demands.

What the Bad Rabbit ransom note looked like in practice

The ransom note was part of the intimidation strategy, as always. Talos reported that the malware dropped a desktop file called DECRYPT and then redirected the machine into a ransom screen after reboot by modifying the Master Boot Record. Victims were pushed toward a Tor payment page, which is how the campaign handled payment instructions and ransom collection.

The Bad Rabbit ransom note was designed to make the loss feel final and urgent. That is the emotional core of most ransomware. Your data is longer accessible, the clock feels like it is ticking, and you are pressured to make a fast decision before thinking clearly. In real life, that pressure is exactly why incident response plans and offline backup copies matter more than panic-driven payment attempts.

Why the threat group question is still complicated

People still ask who was responsible and which threat group sat behind Bad Rabbit. The honest answer is that attribution stayed messy. Talos said there were code-level connections that gave them low confidence the authors of Nyetya or NotPetya and Bad Rabbit were the same, while Kaspersky also pointed to similarities and suspected the same actor may have been behind both.

That does not mean the whole case is solved. Attribution in cyber incidents is rarely that neat. But for readers, the more useful lesson is this: whether the operator was one known threat group or a related team, the campaign mixed web compromise, lateral movement, credential abuse, and encryption in a way that clearly targeted real organizations, not just random home users.

What regular users and teams can learn from Bad Rabbit

The reason Bad Rabbit ransomware still gets cited in security writing is that it teaches very modern lessons. The names change, the loader changes, the lure changes, but the basics keep repeating. A lot of today’s malware still wins through fake pages, risky downloads, weak credentials, and poor recovery planning.

Do not trust update prompts from random pages

If a page suddenly asks you to install something, slow down. That is especially true if the download starts from a browser tab and not from the official vendor. With Bad Rabbit, the fake update was the front door. The same logic applies today to fake browser alerts, fake video codecs, fake drivers, and other shady prompts.

Keep Windows and security tools updated

Even though Bad Rabbit needed user execution for the first step, later movement inside the network made use of SMB-related weaknesses and credential abuse. Patching Windows, limiting exposed SMB, and keeping security tools updated will not solve every problem, but they reduce the number of easy wins attackers can chain together.

Use strong passwords and segment your network

Once passwords are reused across machines, malware has a much easier time moving sideways. Strong unique credentials, fewer admin accounts, and smarter segmentation make it harder for an attacker to jump from one endpoint to many. This matters for both companies and homes with multiple shared devices.

Treat backup as a survival tool, not an afterthought

The most boring defense is still one of the best. A clean backup can save you from a desperate payment decision. If your recovery plan works, the attacker loses a big part of their leverage. That is true whether the incident involves encrypted files, a locked device, or a wider business outage.

Why VeePN helps against Bad Rabbit-style risks

A VPN will not magically undo a click on a malicious installer. We should be honest about that. But Bad Rabbit ransomware shows that attacks often begin in messy real-world conditions: unsafe browsing, suspicious redirects, exposed traffic, and weak visibility into leaks or malicious pages. That is where VeePN becomes useful as an extra layer:

AES-256 encryption

VeePN encrypts your traffic, which helps protect your connection on public or untrusted networks. That matters because attackers do not only rely on fake downloads. They also take advantage of insecure browsing habits, especially when people move between home, office, airport, and café Wi-Fi.

Changing IP address

VeePN masks your IP and makes it harder for trackers and shady actors to tie your browsing to one clear identity and location. That will not stop every infection, but it cuts down on exposure and profiling, which matters when attackers build targeted lures and selective redirect chains.

Kill Switch

If your secure connection drops, Kill Switch blocks traffic so you do not suddenly reconnect without protection. This matters more than people think, especially when you are handling logins, downloads, or admin work on unstable networks. It is a quiet feature, but a very practical one.

NetGuard malicious-site blocking

VeePN’s NetGuard helps block malicious domains, harmful pop-ups, and many risky redirects before they fully load. That is useful in the exact kind of environment where compromised websites or fake update prompts do damage. It adds friction between you and a bad click, which is often all you need.

Antivirus

VeePN also offers antivirus software on supported devices, which adds another layer against dangerous downloads and known malicious files. If a fake installer or suspicious executable lands on your device, that extra scanning layer can help catch trouble before it turns into a full system problem.

Breach Alert

A lot of modern attacks get worse once leaked credentials are in play. VeePN’s Breach Alert warns you when your data may have appeared in a leak, which gives you time to rotate passwords, secure accounts, and reduce the chance of follow-on compromise. That is especially relevant when malware operators try to gain access through stolen or reused credentials.

If you want an extra privacy and security layer against phishing, malicious redirects, and other conditions that help ransomware spread, try VeePN with a 30-day money-back guarantee.

FAQ

The original Bad Rabbit ransomware outbreak belongs to 2017, but the ideas behind it are still alive. Fake updates, poisoned pages, and lateral movement inside a network are still common. So while that exact campaign is old, the risk pattern is absolutely current. Discover more in this article.

It depends on what got hit and what you have in place. Kaspersky said there was no practical universal decryption key without the attackers’ private key, but some victims could recover encrypted files from shadow copies if conditions were right. Your best chance is still a clean backup and fast incident response. Discover more in this article.

Written by Oliver Bennett Oliver Bennett is a dedicated cyber security content writer with a knack for breaking down intricate cyber topics into accessible and actionable insights.