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The affected Polish banks said the malware that infected their computers and servers encrypted its outgoing traffic and they were n't able to tell what the attackers stole .
 ( data breach: stole,  The affected Polish banks: victim, the malware that infected their computers: attack pattern, they: victim, the attackers: attacker, servers encrypted its outgoing traffic: attack pattern) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: stole,  The affected Polish banks: victim, the malware that infected their computers: attack pattern, they: victim, the attackers: attacker, servers encrypted its outgoing traffic: attack pattern) 