Russian hacker Mikhail Matveev has shared a picture of his most-wanted poster printed on a t-shirt. The poster shows up to $10-million bounty announced by US State Department for information leading to his arrest. Also known as 'Wazawaka' and 'Boriscelcin', Matveev was designated as one of FBI's most wanted hackers for carrying out "significant attacks" against US and worldwide companies.