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The group behind the attacks , named APT10 , was found to have used custom malware and " spear phishing " techniques to target managed outsourced IT service companies as stepping stones into the systems of an " unprecedented web " of victims according to the report 's authors .
 ( phishing: spear phishing,  custom malware: tool, outsourced IT service companies: victim, APT10: attacker) 
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:
 ( phishing: spear phishing,  custom malware: tool, outsourced IT service companies: victim, APT10: attacker) 