Dropbox syncs any files added to it. If someone adds files with a virus or malicious software, that file syncs to any computers linked to the account. If the virus or malicious software is in a shared folder, shared folder members and computers may also be affected.
Malicious software files are generally not activated unless you open them. For this reason, just as with files from any other source, we recommend that you follow good security practices, including:
- Running anti-virus software
- Exercising due caution when running unknown files from other computers
If your files have been corrupted by malicious software (such as ransomware), you may be able to restore the files to the state they were in before the malicious software took effect.