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Specifically , researchers found an Android version of X-Agent , a piece of malware known to be used by Fancy Bear , embedded in an app developed by artillery officer Yaroslav Sherstuk to help military personnel reduce the time to fire D - 30 howitzers .
 artillery officer Yaroslav Sherstuk: vulnerable system owner; researchers: discoverer; an app: vulnerable system; X-Agent: vulnerable system; Android: supported platform
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:
 artillery officer Yaroslav Sherstuk: vulnerable system owner; researchers: discoverer; an app: vulnerable system; X-Agent: vulnerable system; Android: supported platform