Security researchers find multistage Android malware on Google Play

Malware apps found on Google Play deliver their payload as a secondary app after installation

Security researchers from antivirus vendor Symantec identified two malware apps on Google Play that used a multistage payload delivery system in order to remain undetected.

The apps, which have since been removed by Google, masqueraded as two games -- "Super Mario Bros." and "GTA 3 - Moscow city."

"Both were posted to Google Play on June 24 and since then have generated in the range of 50,000 to 100,000 downloads," Symantec security researcher Irfan Asrar said Tuesday in a blog post.

Once installed, the apps downloaded an additional package called Activator.apk from a Dropbox account and prompted the device owners to install it.

This secondary Activator app sent SMS messages to a premium-rate number located in Eastern Europe, after which it asked to be uninstalled.

The fact that the malicious payload was delivered in multiple stages is probably why the apps managed to remain undetected for so long on Google Play, Asrar said.

Earlier this year, Google started using an automated scanner called Bouncer to detect malware on Google Play. Bouncer runs all published apps in an emulated Android environment and monitors them for suspicious activity.

However, downloading a secondary app from a developer's server and prompting the user to install it might not necessarily represent malicious behavior.

This is not the first time when Android malware developers have used multi-stage payloads. The Android.Lightdd and Android.Jsmshider threats discovered in 2011 both downloaded additional components after the installation of an initial app.

There are several advantages to spreading the payload across multiple apps, Asrar said about those threats at the time. For one, the initial malicious app no longer needs to display an extensive list of permissions that might attract the user's attention.

Secondly, if the initial app is downloaded from the official Android marketplace -- now called Google Play -- the user is likely to assume that the additional apps also originate from there.

Symantec detects the two newly found malware apps as Android.Dropdialer. The Android security team immediately removed the threat after being notified by Symantec, Asrar said.

Join the PC World newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Lucian Constantin

IDG News Service
Show Comments

Essentials

Lexar® JumpDrive® S57 USB 3.0 flash drive

Learn more >

Microsoft L5V-00027 Sculpt Ergonomic Keyboard Desktop

Learn more >

Mobile

Lexar® JumpDrive® S45 USB 3.0 flash drive 

Learn more >

Exec

Lexar® Professional 1800x microSDHC™/microSDXC™ UHS-II cards 

Learn more >

Lexar® JumpDrive® C20c USB Type-C flash drive 

Learn more >

Audio-Technica ATH-ANC70 Noise Cancelling Headphones

Learn more >

HD Pan/Tilt Wi-Fi Camera with Night Vision NC450

Learn more >

Budget

Back To Business Guide

Click for more ›

Most Popular Reviews

Latest News Articles

Resources

GGG Evaluation Team

Michael Hargreaves

Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell

LIFEBOOK UH574

The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi

STYLISTIC Q702

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?