Daisuke Nakajima

Daisuke Nakajima is a mobile malware researcher and part of McAfee's Mobile Malware Research and Operations team. He is based in Tokyo, and specializes in mobile malware analysis, reverse-engineering, and malware detection code development and performance tuning, and research on big data analysis-based malware detection technology. He is also actively monitoring and reporting mobile threats targeting consumer users in Japan.

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Mobile and IoT Security McAfee Labs

Adobe Flash Player Installer Scams Reappear on Google Play

Adobe Flash Player has been a boon to Android malware creators for a long time. These developers have taken advantage of Flash’s popularity to create premium SMS Trojans and droppers, as well as other types of malware. McAfee Labs has detected a common scam app–Android/Fladstep.B–on the Google Play store since ...

Mobile and IoT Security McAfee Labs

Suspicious Mobile App Finds Your Gmail, Facebook, and Twitter Accounts

Today many people use multiple web services, such as social networking and messaging services. Some users explicitly show their identity in these services, but others visit those services separately–as unidentifiable, different users. To protect their privacy, the latter group might not want their accounts and activities on multiple services to ...

Mobile and IoT Security McAfee Labs

Automatic App Installation from Google Play Poses Big Risk

Android users usually download and install applications from the Google Play store through several interactions with the service–including viewing the app’s description and granting permission requests by the app. This confirmation procedure helps us avoid installing malicious and potentially unwanted apps. However, McAfee recently found a suspicious app on Google ...

Mobile and IoT Security McAfee Labs

Vietnamese ‘Adult’ Apps on Google Play Open Gate to SMS Trojans

Malware related to short message services occupies a large portion of today’s Android malware families. These include premium SMS fraud and SMS spying. Such SMS-based malware apps are actively distributed via unofficial or malicious app stores, but it is rare to find them on Google Play, the world’s largest official ...

Mobile and IoT Security McAfee Labs

Chat Friend Finder Apps on Google Play Leak Personal Information

Somewhat controversial websites or apps called chat friend finders, or ID BBS (Bulletin Board System) are spreading widely in Japan. They allow users of well-known communication services like LINE and Kakao Talk to make friends with others by publishing profiles and service IDs, yet without disclosing real phone numbers and ...

Mobile and IoT Security McAfee Labs

One-Click Scammers Still Targeting Japanese Smartphone Users

Last year we saw an attack targeting Android device users in which more than 2,400 malicious one-click fraud apps were published on Google Play in Japan. The attack has calmed down since October 2013, but it seems the scammers are still looking for opportunities to victimize smart device users in ...

Mobile and IoT Security McAfee Labs

Suspicious Apps on Google Play Leak Google Account IDs

The Google account ID (or account name), which in most cases is a Gmail address, is one of the key identifiers of Android device users. McAfee has confirmed a substantial amount of suspicious apps secretly collect Google account IDs on Google Play. In these cases, the corresponding Google account password ...

Mobile and IoT Security McAfee Labs

More Japanese Chat Apps on Google Play Steal Phone Numbers

In two recent blogs, McAfee Labs described Japanese and Korean Android apps on Google Play that steal a mobile device’s phone number. We have now found two more Japanese chat apps that show similar behavior. These two apps have been downloaded between 10,000 and 50,000 times each. The developers of ...

McAfee Labs

JavaScript Apps on Google Play Steal Korean Phone Numbers

In a recent blog, McAfee Labs reported on suspicious JavaScript-based Android chat applications for Japanese users. These apps were found on Google Play, and steal users’ phone numbers. We have now found about 120 applications that use similar, but not the same, JavaScript techniques to steal a device’s phone number. ...

Mobile and IoT Security McAfee Labs

Japanese Chat App for Android Steals Phone Numbers

Update, December 5 The developer of the app Machin Chat has contacted McAfee and reported that the collection of phone numbers was inadvertent and that they have no malicious intent. We have verified that updated code no longer collects phone numbers. The updated app is available on Google Play. (Older ...

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