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For the second time in three years , the school district is the target of a ransomware attack — a particularly virulent computer malware that spreads from computer to computer , locking up access to network servers and turning documents into gibberish before offering " help " in the form of a request for payment to provide a " key " to unlock the files .
 ransom: a ransomware attack
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 ransom: a ransomware attack