640
And more recently , researchers discovered an attack called “ DoubleAgent , ” which turned Microsoft ’s Application Verifier tool into a malware entry point .
 researchers: discoverer; Application Verifier tool: vulnerable system; Microsoft: vulnerable system owner
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 researchers: discoverer; Application Verifier tool: vulnerable system; Microsoft: vulnerable system owner