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Geinimi , Sophisticated New Android Trojan Found in Wild

Geinimi , Sophisticated New Android Trojan Found in Wild. 報告人：劉旭哲. a new Trojan affecting Android devices Geinimi 'botnet-like' capabilities Geinimi is effectively being “grafted” onto repackaged versions of legitimate applications. Games includes Monkey Jump 2 Sex Positions

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Geinimi , Sophisticated New Android Trojan Found in Wild

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  1. Geinimi, Sophisticated New Android Trojan Found in Wild 報告人：劉旭哲

  2. a new Trojan affecting Android devices • Geinimi • 'botnet-like' capabilities • Geinimi is effectively being “grafted” onto repackaged versions of legitimate applications

  3. Games includes • Monkey Jump 2 • Sex Positions • President vs. Aliens • City Defense and Baseball Superstars 2010. • Third-party Chinese Android app markets. • The original versions available in the official Google Android Market have not been affected.

  4. Geinimi has three different methods of starting itself • First the Trojan will launch it’s own Service • The other two ways Geinimi starts revolve around BroadcastReceivers • SMS has been received (SMS_RECEIVED) • Phone starts (BOOT_COMPLETE)

  5. Overwritten AndroidManifest.xml

  6. entry points execute the method “startServiceIfMust”, which attempts to connect to the local Geinimi service. • Update and Check-in • Communication with the service happens over a TCP socket on ports 5432, 4501 or 6543. • Check-in between the server and Trojan is also encrypted.

  7. Every five minutes by default, but can be changed by the server. • GET request • uses HTTP POST requests to send results of commands. Geinimi version uniquely identify the user Location unique per infected package

  8. Geinimi attempts to connect to a remote server using one of 11 embedded domain names. 反向工程解密後…

  9. Encryption • 56-bit DES • a key of 0x0102030405060708. • This is found inside jump2.e.k • eg: Monkey Jump 2

  10. Command and Control • 格式：

  11. AdID

  12. Smsrecord • Post stored SMS to a remote server • result：POST jump2.e.i.a(String server, String afterDate, String beforeDate)

  13. install:// and install - Download an APK ; trigger installation

  14. Conclusion • 雖然已觀察到Geinimi連結並傳送資料C&C Server但尚未看到有伺服器傳送指令給Geinimi • 此外，不論是要求使用者安裝或移除應用程式，皆仍必須經過使用者同意。 • 目前推斷可能是想要藉由這種方式散播廣告

  15. http://www.ithome.com.tw/itadm/article.php?c=65279 • http://blog.mylookout.com/2011/01/geinimi-trojan-technical-analysis/ • http://cdn.androidcommunity.com/wp-content/uploads/2011/01/Geinimi_Trojan_Teardown.pdf

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