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Guide
How does ransomware work?
The confusion
Ransomware stories in the news describe hospitals shut down, pipelines offline, millions in payments. The coverage describes the damage but rarely the mechanism — how exactly files become inaccessible, why paying sometimes works and sometimes doesn't, and what 'backup' actually means in the context of an active attack.
Security advice says 'keep backups.' It doesn't explain that ransomware specifically targets backup systems, that cloud sync can propagate encrypted files before you notice, or that the window between infection and encryption is often measured in minutes. 'Keep backups' is correct advice that doesn't convey the actual constraint.
Understanding the mechanism changes which defenses matter and why rollback — not just detection — is a feature worth evaluating in antivirus products.
What most people assume
Most people assume ransomware works like other malware — it spreads, damages things, gets caught by antivirus. The critical difference is that ransomware doesn't damage files in the way a destructive virus does. It encrypts them using legitimate cryptographic operations. The files aren't corrupted — they're locked. Antivirus detecting file encryption in progress is detecting a legitimate operation being used maliciously, which is significantly harder than detecting known malicious code.
Most people assume the choice after infection is binary: pay and recover, or refuse and lose everything. The actual options are more granular and depend on which ransomware strain is involved, whether decryptors exist (law enforcement and security researchers have cracked some strains), whether file shadow copies survived, whether a clean backup exists and how recent it is, and whether rollback was active during the encryption event. Payment is one option among several — and not a reliable one, since some operators take payment without providing working keys.
Most people assume cloud backups protect against ransomware because the files are 'somewhere else.' Cloud sync services like Dropbox, OneDrive, and Google Drive sync file changes — including encryption. A ransomware attack that runs before the sync window catches up propagates the encrypted versions to the cloud and overwrites the originals. Versioned backup (keeping previous versions of files for a defined period) is different from sync, and the distinction matters significantly.
What's actually true
Ransomware typically enters through a phishing attachment, a malicious download, or a compromised RDP or VPN endpoint. Once executing, it enumerates files — documents, images, databases, anything with value — and encrypts them using a key the attacker controls. On modern hardware this completes in minutes to hours depending on the volume of files. Ransom notes appear after encryption is complete. By the time most people notice, the encryption has already finished.
The defenses that matter most: behavioral detection that catches mass file modification in progress (this is what ransomware rollback depends on — intercepting the encryption before all files are affected), isolated offline or versioned backups that ransomware can't reach during an attack, and network segmentation that limits how far an infection can spread before being contained. Antivirus with rollback specifically monitors for rapid bulk file modification and attempts to recover from a snapshot taken before the attack started.
Where you might be
If you're evaluating antivirus products and ransomware protection is a specific concern — rollback capability is the feature that matters here, not detection rate alone. Not all products include it, and implementation quality varies.
See products with meaningful ransomware rollback →
If you've already experienced a ransomware event and are trying to understand your options — what can be recovered, whether paying makes sense, what to do with the machine — that's a specific situation that doesn't follow the standard antivirus path.
See the ransomware response path →If you're setting up protection for a machine that holds files you can't afford to lose — work documents, photos, anything irreplaceable — the backup architecture matters as much as the antivirus choice.
See the protection decision guide for high-stakes setups →What no tool solves
Rollback is not a complete defense. It works by catching mass file modification in progress and reverting to a pre-attack snapshot — but it requires that the behavioral monitoring engages before all files are encrypted. On very fast ransomware strains, or on machines with large file volumes, some files may be beyond recovery even with rollback active.
Backups that are connected to the infected machine during an attack are at risk. Network-attached storage, mapped drives, and sync services that stay connected are reachable. Isolated backups — external drives disconnected when not in use, or versioned cloud backups with a deletion delay — are the only categories that survive an attack consistently.
Ransomware-as-a-service has lowered the technical barrier for attackers. The tools that once required sophisticated criminal groups are now available for rent. This means the attack surface isn't limited to high-value business targets — home users with anything worth encrypting are viable targets.
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