Ransomware and Your PIMS: What Happens When a Veterinary Practice Can't Reach Its Records

Every veterinary practice has one system it genuinely cannot operate without. It's not the X-ray machine or the autoclave — it's the PIMS: the practice management software that holds the schedule, the patient records, the treatment histories, the controlled-substance logs, and the billing. Cornerstone, AVImark, ezyVet, ImproMed — whatever the name, it runs the practice.

That total dependence is exactly what makes the PIMS the prize target for ransomware. Attackers don't encrypt systems at random; they go for the one whose loss is unbearable, because an unbearable loss is what gets a ransom paid quickly.

Why a Practice Is Such an Attractive Target

There's a comforting myth that small practices are too small to be worth attacking. The opposite is true. Most ransomware is automated and opportunistic — it finds victims by scanning for exposed systems and phishing inboxes at scale, not by picking names off a list. And when it does land somewhere, a small veterinary practice has two qualities an attacker loves: defences that are usually thin, and zero tolerance for downtime. A practice with a full waiting room and no access to records is under enormous pressure to make the problem go away. For the wider picture, see why small businesses are the #1 ransomware target.

The Day It Happens

Here is how a PIMS ransomware incident typically unfolds. The following is an illustrative scenario, not a specific client's story — but every step in it is ordinary.

It usually starts days earlier, quietly. A staff member receives a convincing email, clicks a link, and enters a password into a fake login page. The attacker now has a foothold and spends days moving through the network unnoticed, locating the PIMS data and the backups.

Then, often overnight or over a weekend, the encryption runs. Staff arrive to find the PIMS won't open. There's no schedule, so no one knows who's booked. There are no histories, so a returning patient's chart is a blank. Controlled-substance records are unreachable. Card processing is down. A ransom note names a price.

What follows is days — sometimes weeks — of running the practice on paper, turning clients away, reconstructing records, and absorbing the cost. The ransom, if it's even considered, is usually the smaller line in the final bill. Lost revenue, recovery labour, and the damage to a community practice's reputation are larger.

Why Your PIMS Vendor Isn't Your Safety Net

“Our PIMS is hosted — the vendor backs it up” is the single most common reason practices skip ransomware preparation. It is also a misunderstanding worth correcting carefully.

Your PIMS vendor secures and backs up their platform. That is real and valuable. But ransomware in a practice rarely confines itself to the hosted PIMS. It hits the local devices, the file shares, the locally cached data, the imaging systems, the email. The vendor's recovery does nothing for any of that. And even cloud PIMS data can be damaged if an attacker reaches it through a compromised staff login — which is why vendor-managed software is also a third-party risk you have to manage, not a guarantee.

The Controls That Change the Outcome

A PIMS ransomware attack has two very different endings, and the difference isn't luck — it's preparation. The practice with the controls below is operating again within a day or two. The practice without them is reconstructing records for weeks.

The single most important item on that list is backups — but only the right kind. Ransomware deliberately seeks out and encrypts connected backups first, so a backup that's always plugged in is no backup at all. You need copies that are offsite and immutable, and you need to have actually tested a restore. Our 3-2-1 backup guide explains exactly what that means in practice.

The Bottom Line

Your PIMS is the most valuable thing in the practice and the thing an attacker most wants to hold hostage. You can't make a practice an uninteresting target — but you can make it a hard one, and you can make sure an attack is a recoverable bad week rather than an existential event.

That's the whole goal: MFA and training so the attack is less likely to land, EDR and segmentation so it can't spread, and tested offsite backups so that if it does, you simply restore and reopen. If you'd like a partner who already knows how a practice runs, see our cybersecurity for veterinary practices, or read the broader veterinary practice cybersecurity guide.