The Harris Federation, which runs 50 primary and secondary academies in and around London, said it had temporarily disabled email
while it deals with the cyber-attack.
Data on the systems has been encrypted and hidden by the attackers.
Last week, the National Cyber Security Centre (NCSC) issued a warning that hackers are targeting schools.
'Sophisticated attack'
“We are at least the fourth multi-academy trust to have been targeted in March,” a statement on the Harris Federation website said.
“This is a highly sophisticated attack that will have a significant impact on our academies but it will take time to uncover the exact details
of what has or has not happened, and to resolve.
“As a precaution, we have temporarily disabled our email system.”
Any devices which the Harris Federation have given to pupils have also been disabled, the statement added.
However, schools have recently returned to in-person learning as part of the easing of lockdown restrictions - meaning students can still
attend classes.
Harris Federation schools break up for Easter later this week.
Its statement did not detail what information or data has been compromised, and it has not yet responded to the BBC's request for comment.
The trust is working with “a specialised firm of cyber-technology consultants”, the National Crime Agency and the NCSC to resolve the issues.
The NCSC said it has "recently alerted the education sector to the significant threat posed by ransomware attacks" and urged schools and
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