Japan's Daily Yomiuri reports that six men have been arrested for stealing more than 20 million Yen (approximately $250,000) from smartphone users via a malicious mobile app.

"This is Japan's first case in which police have built a case involving distribution of a smartphone virus, according to the Metropolitan Police Department," the Daily Yomiuri reports. "The application was for playing videos and could be downloaded for free through an adult site on the Internet."

"Once installed on a phone, a screen would pop up every five minutes, urging the victim to pay a fictitious fee of around $1,200," writes Softpedia's Eduard Kovacs. "'Please pay the fees as soon as possible. You need to confirm the unpaid amount. It totals 99,800 yen,' read the alert seen by the victims. The app was also designed to steal phone numbers, email addresses and any other valuable information it could find, storing it all on a server located overseas."

"The malicious app has been available for download since late December 2011, and has since then been downloaded by 9,252 users," writes Help Net Security's Zejlka Zorz. "Of those, 211 individuals fell for the scam and paid the requested fee."

"Tokyo police arrested six people in connection with the malware, including 45-year-old Chitoru Manago, of Shingu, Wakayama Prefecture; Kazunori Makita, 27, of Edogawa Ward, Tokyo; and Hiroki Koyama, 53, of Setagaya Ward, Tokyo," writes Sophos' Graham Cluley.

"Two of those arrested were currently senior managers in hi-tech firms in Japan, police said," BBC News reports.