Mobile Lowdown 5-11-11: Android Malware; GetJar; Moto; inMobi

Our look at some of the big stories in mobile today: the latest tally on Android malware; GetJar buys an app discover and metrics provider, Infrinity; Motorola (NYSE: MMI) Mobility buys video content delivery specialist SunUp Systems; and inMobi launches a payment service on its ad network and ties up with Amobee.

Android malware: A new report from Juniper Networks details some of the biggest security threats to mobile devices today.

One of the more striking numbers is the rise in malware for Android, one of the most popular smartphone platforms, which has gone up by 400 percent since last summer. (We highlighted one particularly nasty attack earlier this year, in which a rogue developer created a series of apps — one pictured here — that looked like popular existing apps but contained code that picked data up from devices.)

Other issues raised in the report include targeted WiFi attacks, and worries about app stores and rogue text messages: these happen to be three of the most common ways that malware gets distributed.

GetJar: The independent app store operator is ramping up the kinds of services it can offer publishers using its platform. The latest move: it has bought Infrinity, which develops analytics around app discovery and usage. As part of the acquisition, it has appointed Infrinity’s CTO and founder, Anand Venkataraman, as GetJar’s new VP of discovery technologies. Financial terms of the deal were not disclosed in the announcement.

Motorola Mobility: An acquisition that highlights some of the priorities of suppliers and service providers as they seek to build stronger relationships with the content industry: Motorola has acquired SunUp Digital Systems, a software developer that focusses on video delivery and digital rights management.

SunUp’s main focus is on video delivery across multiple devices; it looks like the acquisition will sit in Motorola’s service provider product portfolio, sold to operators that are looking increasingly at services that offer video content across mobile, tablet and other screens. Financial terms of the deal were not disclosed.

inMobi: A couple of big milestones in the past two days for the mobile ad network inMobi that point to some of the varying business models you are seeing among mobile ad networks — especially independent ones that do not have the scale of an AdMob.

Today the company announced a multi-year, multi-million-dollar deal with Amobee, which offers mobile advertising solutions to third parties, for those using Amobee products to develop their ads to then post them on inMobi’s international, multi-platform mobile ad network.

This follows yesterday’s news that inMobi has launched a new mobile payments system for its ad network. The new service, called SmartPay, is aimed at app developers, game companies, and content providers the option of including payment services within their ads. These will first be charged using carrier billing arrangements, but inMobi says it will soon also be adding credit cards, PayPal and mobile wallet solutions into the mix by the end of this year.