HKCert
Security Blog

Hong Kong Google Play Store's Apps Security Risk Report (October 2013)

Release Date: 25 / 10 / 2013
Last Update: 25 / 10 / 2013

banner

 

Hong Kong Computer Emergency Response Team (HKCERT) Coordination Centre cooperates with the National Institute of Network and Information Security (NINIS) for detecting malicious and suspicious behaviors of Apps from the Google Play Store, in order to study the security risk of apps in the Google Play Store in Hong Kong area. NINIS provides us analyzed result, and we collate the detection result and publish security alerts to the public.

 

In the report of October, we have downloaded 180 apps from Play Store, where 11 apps have been identified as high risk. 8 of them were removed from Play Store (on or before 25-October). The detail of report is shown as follow.

 

Target scope:

  • Top 50 Free Applications in Hong Kong area
  • Top 50 New Free Applications in Hong Kong area
  • Top 50 Free Games in Hong Kong area
  • Top 50 New Free Games in Hong Kong area

 

Scanned Apps

  • Successful downloaded and scanned: 180 apps
  • Unable to download via the system: 20 apps
  • Downloaded date: 7-October 2013
  • List of the downloaded apps: "Appendix 1" [download]

 

Analysis Overview

 

In this analysis, 180 apps were scanned for bad behaviors. Based on the level of security threat, the apps were divided into 2 categories: apps with malicious and apps with suspicious behaviors. Malicious behavior refers to apps behavior pose malicious level of security risk, which can be identified explicitly, that causes security threat to users. Suspicious behavior refers to apps behavior pose certain level of security risk, but no malicious behavior can be explicitly identified.

 

1. Scanning Result

 

Among the 180 scanned apps, 11 apps were identified as security high risk. These 11 Apps were identified with the following high risk behavior signatures, Android.Adware.Adwo, Android.Adware.Plankton, Android.Trojan.Generic, Android.Adware.Apperhand, Android.Adware.AirPush, ApplicUnwnt, Android.Adware.Kuguo, Android.Adware.Wapsx, Android.Adware.InMobiAds, Android.AdWare.AdMogo, Android.AdWare.Leadbolt, and Android.AdWare.MobWin.

 

List of security high risk apps

 

Application

High risk behavior signature / Ad plug-in

Malware detection ratio by VirusTotal

Status #

1. 我是谁-背影猜猜猜(横扫疯狂猜歌,疯狂猜图,疯狂猜成语) v1.0.2

Category: Top Free Game
Installs: 50,000-250,000
High risk behavior description:
It can obtain the name of SIM service provider, obtain SIM status, read phone number, make phone call, and send out phone information.

Android.Adware.Adwo
Android.Trojan.Generic

10/47 [link]

Available on play store

2. 3國小豬 香港王 v1

Category: Top Free Game
Installs: 10,000-50,000
High risk behavior description:
It can obtain SIM serial number, make phone call, enable camera automatically, send out phone information, and connect to the Internet.

Android.Trojan.Generic
Android.AdWare.MobWin

12/47 [link]
 

Available on play store

3. 成人快播 v5

Category: New Free Application
Installs: 50,000-250,000
High risk behavior description:
It can connect to the Internet, use Intent to modify user data,make phone call, enable camera, and use Intent to send out phone information.

Android.Adware.Wapsx
ApplicUnwnt

16/48 [link]
 

Removed from play store

4. 手机铃声 - 好铃声 , 好心情 v1.6

Category: New Free Application
Installs: 50,000-250,000
High risk behavior description:
It can obtain SIM status, make phone call, send out phone information, and connect to the Internet.

Android.Adware.InMobiAds
Android.AdWare.AdWo

9/46 [link]

Removed from play store

5. 午夜好消遣:高清,激情,美女,資源,成人,快播,影院 v2.6.2

Category: New Free Application
Installs: 10,000-50,000
High risk behavior description:
It can obtain SIM serial number, read phone number, make phone call, send out phone information, and connect to the Internet.

Android.Adware.Plankton
Android.Adware.Apperhand
Adware.Android.AirPush
ApplicUnwnt

19/47 [link]

Removed from play store

6. 2014生肖運程 祈福消災 靈符轉運 v2.0.1

Category: New Free Application
Installs: 5,000-10,000
High risk behavior description:
It can obtain SIM serial number, read phone number, send out phone information, and connect to the Internet.

Android.AdWare.AdWo
Android.Trojan.Generic

10/44 [link]

Available on play store

7. 空空高清--最新快播资源成人视频激情高清名字要长 v1

Category: New Free Application
Installs: 10,000-50,000
High risk behavior description:
It can obtain SIM status, make phone call, and connect to the Internet.

Android.Adware.AirPush
Android.Adware.Plankton
Android.Adware.Apperhand
Android.Trojan.Generic

19/48 [link]

Removed from play store

8. Free music mp3 downloader Pro v4.2

Category: New Free Application
Installs: 10,000-50,000
High risk behavior description:
It can obtain SIM status, read audio record, make phone call, send out phone information, and connect to the Internet.

Android.AdWare.Leadbolt
Android.Trojan.Generic

11/47 [link]

Removed from play store

9. 激情成人电影 v1.4.1

Category: New Free Application
Installs: 5,000-10,000
High risk behavior description:
It can obtain SIM status, read phone number, send out phone information, and connect to the Internet.

Android.Adware.Kuguo
Android.Trojan.Generic

16/47 [link]

Removed from play store

10. 激情成人视频 v1

Category: New Free Application
Installs: 5,000-10,000
High risk behavior description:
It can obtain SIM status, read phone number, send out phone information, and connect to the Internet.

Android.AdWare.AdMogo
Android.AdWare.AdWo
Android.Trojan.Generic

11/47 [link]

Removed from play store

11. 无码高清激情视频(快播) v5

Category: New Free Application
Installs: 10,000-50,000
High risk behavior description:
It can obtain SIM status, make phone call, and connect to the Internet.

Android.Adware.Plankton
Android.Adware.AirPush
Android.AdWare.Apperhand

16/47 [link]

Removed from play store

Remark (#): The status was checked on 25-October
 
2. High risk behavior signature and Ad plug-in
 

High risk behavior signature and Ad plug-in

High risk behavior

Android.Adware.Plankton

It is an Ad plug-in bundled with App, which can steal user's private information, such as phone number and email address, and send to the 3rd parties. This behavior is called "aggressive advertisement", which forces displaying ads on the main screen.

Android.Adware.Adwo

It is an Ad plug-in bundled with App, which can steal user's private information, such as phone number and email address.

Android.Adware.AirPush

This is an advertisement framework. It can aggressively push ad to device's notification bar. It can modify browser's bookmark, and remove icon on the main screen. The ads will ask for money. Some ads showed in the notification bar will lure user to subscribe and pay for SMS service. Three common luring ads are 1) fake shop, 2) fake free call service, 3) system notification impersonation

Android.Trojan.Generic

This is a malicious backdoor Trojan, which runs in the background. It allows remote access to the infected system. It will collect and steal sensitive information, such as Internet activities, account/password setting, geo-location, operator name, system version, device model, IMEI, etc.

Android.AdWare.Apperhand

This high risk app can execute specified command and steal information. It can obtain user's private information. This app contains specified vulnerabilities, which can be exploited to compromise the system.

Android.AdWare.Leadbolt

It is a high risk Ad plug-in, which can steal user's private information, including phone number, call history, geo-location, etc.

Android.Adware.Wapsx

It is a high risk Adware. When the phone downloads and runs the app, it will download another data packet automatically and pop-up advertisement. The other versions of this Adware are also found as spyware and Information stealer apps.

ApplicUnwnt

This high risk app is a Trojan, liked Android.Trojan.Generic. It can collect and steal user's private information at the background.

Android.Adware.InMobiAds

It is a high risk Ad plug-in, which can steal user's private information, including phone number, call history, geo-location, etc.

Android.AdWare.AdMogo

It is a high risk Ad plug-in, which can steal user's private information, including phone number, call history, geo-location, etc.

Android.Adware.Kuguo

It is an Ad plug-in bundled with App, which can steal user's private information, such as phone number and email address.

Android.AdWare.MobWin

It is an Ad plug-in bundled with App, which can steal user's private information, such as phone number and email address.

 
3. High risk app analysis
 
Please refer to "Appendix 2" [download]