HKCert
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Hong Kong Google Play Store's Apps Security Risk Report (November 2015)

Release Date: 30 / 11 / 2015
Last Update: 30 / 11 / 2015

 

Hong Kong Computer Emergency Response Team (HKCERT) Coordination Centre cooperates with the National Computer Network Emergency Response Technical Team of China (CNCERT) 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. CNCERT provides us analyzed result, and we collate the detection result and publish security alerts to the public.

In the report of November, we have downloaded 200 apps from Play Store, where 5 apps have been identified as high risk. None of them were removed from Play Store (on or before 27-Nov). 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: 200 apps
  • Unable to download via the system: 0 apps
  • Downloaded date: 5-November 2015
  • List of the downloaded apps: "Appendix 1" [download]

 

Analysis Overview


In this analysis, 200 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 having malicious purpose explicitly, which could cause direct harm to systems and users' interests. Suspicious behavior refers to apps having behavior, which could cause direct harm to systems and users' interests, but no malicious behavior can be explicitly identified.

1.    Scanning Result

Among the 200 scanned apps, 5 apps were identified as security high risk. These 5 Apps were identified with the following high risk behavior signatures PUA.AndroidOS.Autoins, a variant of Android/Autoins.S potentially unsafe, a variant of Android/Suaban.A potentially unwanted, Riskware/AnroidOSFictus, Trojan.Android.Cajino.dqfver, etc.

List of security high risk apps

 

Application

High risk behavior signature / Ad plug-in

Malware detection ratio by VirusTotal

Status #

1) 波利の冒險    (v1.0.5.0)

Category: Top Free App, New Free App, Top Free Game, New Free Game
Installs: 50,000+
High risk behavior description:
obtain SIM operator name, obtain SIM serial number, obtain SIM status, obtain geo-location information, obtain WiFi configuration, and obtain device information.

PUA.AndroidOS.Autoins

8 / 55 [Link]

Available on play store

2) 呂布!請留步 變身逗戰群雄    (v1.4.5)

Category: Top Free App, New Free App, Top Free Game, New Free Game
Installs: 100,000+
High risk behavior description:
obtain SIM operator name, obtain SIM status, obtain geo-location information, obtain device information, connect to the Internet, and send out phone information.

a variant of Android/Autoins.S potentially unsafe

2 / 54 [Link]

Available on play store

3) walking dead:zombie killer    (v1.01)

Category: New Free Game
Installs: 10,000+
High risk behavior description:
obtain SIM operator name, obtain SIM serial number, obtain geo-location information, obtain device information, and send out phone information.

a variant of Android/Suaban.A potentially unwanted

8 / 54 [Link]

Available on play store

4) 銀河護衛隊 - 開啟新的霸略    (v1.4)

Category: New Free App, New Free Game
Installs: 50,000+
High risk behavior description:
obtain SIM operator name, obtain geo-location information, obtain WiFi configuration, obtain device information, connect to the Internet, and send out phone information.

Riskware/AnroidOSFictus

0 / 54 [Link]

Available on play store

5) NBA范特西:2016夢之隊﹣NBA官方手遊    (v1.0.6)

Category: New Free App, New Free Game
Installs: 10,000+
High risk behavior description:
obtain SIM operator name, obtain SIM serial number, obtain SIM status, obtain geo-location information, obtain WiFi configuration, read phone number, and connect to the Internet.

Trojan.Android.Cajino.dqfver

1 / 54 [Link]

Available on play store

 

Remark (#): The status was checked on 27-Nov. There is no direct relation between the on-shelf status and this report.

 

2.    High risk behavior signature and Ad plug-in

 

High risk behavior signature and Ad plug-in

High risk behavior

PUA.AndroidOS.Autoins

It is a high risk application, when it is running, it can steal user information, such as geo-location, phone number, etc. at the background.

a variant of Android/Autoins.S potentially unsafe

It is a high risk app Android/Autoins.S variant, when it is running, it can connect to the Internet and steal user information, such as geo-location, etc. at the background.

a variant of Android/Suaban.A potentially unwanted

It is a high risk app Android/Suaban.A variant, when it is running, it can disclosure user information, such as geo-location, etc.

Riskware/AnroidOSFictus

This is advertisement software bundled with the application, which can insert advertisement in the app, download and install new app, steal user's private information, such as geo-location, phone number, etc.

Trojan.Android.Cajino.dqfver

It is a high risk app. When the app is running, it can steal user phone number and geo-location. It can cause user information disclosure and pay additional charge.

 

3.    High risk app analysis


Please refer to "Appendix 2" [download]