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Android apps infected with Windows malware reemerge

100+ Android apps infected with Windows malware found on Google Play

By: Gaurav Shinde

MalwareMobile

Android apps infected with Windows malware reemerge

Introduction

During our regular course of tracking malicious Android apps in the wild, we came across an app available on the Google Play store that was infected with a malicious iFrame. Upon further analysis, we found hundreds of such apps on Google Play with the same infection.

This is not a new threat. Similar infected apps have been found by other researchers, in which the app author’s development platform was probably infected with this malware that injects the malicious iFrame on all HTML files found on the system. It is surprising to see that the trend of APKs infected with Windows malware has continued for almost a year.

There is no impact on the end mobile users who download these apps, as the malware does not target the Android platform, and the domains involved had already been sinkholed. However, the discovery of the malware highlights the fact that propagation of infections across different platforms is quite possible. This vector can be leveraged by a clever attacker to serve second-level malicious payloads depending on the type of device platform visiting the URL.

                                Fig. 1: Apps on Google Play from the developer technodroid

 

Infected HTML in APK – Ramnit

Infected Android Package Kit (APK) files contain HTML files infected by the Ramnit worm. This worm spreads by infecting all available EXE, DLL, HTML, and HTM files on the compromised Windows system. If the developer’s system is infected with this worm, it will inject a malicious iFrame in the HTM/HTML files in the source code of Android projects that eventually end up in the APK. Since the URL used in the injected iFrame is sinkholed by the Polish CERT, this infection won’t cause any harm to Android devices.

 

                                                 Fig. 2: IFrame injected at the end of HTML

 

We found around 150 infected apps that belonged to different developers. Almost all of these APK files are being flagged for the Windows malware infection by various host AV scanners.

 

                                                                        Fig. 3: VirusTotal scan result for a sample APK

 

Conclusion

We have reached out to the Google Android security team and shared our analysis. While this malware currently doesn’t cause harm to end users, it is clear that such infections can otherwise act as an open door for other attacks. Google has a category defined to flag such potentially harmful applications known as non-Android threats. Google’s definition of this category is: “An application that contains non-Android threats. These apps are unable to cause harm to the user or Android device, but contain components that are potentially harmful to other platforms.”  

IOCs

                             MD5                         Package Name
259c29cdfb91f48a5321e89d9d2d6f1d
98768a47b3e351063734b972bd5c67ca
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1821b5a991df3ae195d9cc4dd03e12f8
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182a5c4a19c0a18344c083cfc43341eb
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a1ec080f32775dd8305b2f3bdbc0015b
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0ed956b4795fa862fb13fb0b4423f7b3
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a56041d1b5f32ca392cbb3ff5e0c7519
189edf5ab8e71f06415fb9d5c323e0d4
0f10940ae7852b4ca43cf869013420c6
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00141ea42b8a289bd2244c693e477001
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1ea7dc242f4248ef2048d5a9978acd0a
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2dcace2f8316dd212f1136dfb83bacb4
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24313f1cd4082a89112af29b551e5f86
3de2dc4422b7530e9e7bd7f1d09de111
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099ed0a8ca86f2a6d89a30ac173e20a6
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066a09af0aece59471faf7c20f3c8ce3
6fb66f6d03b864f6fd22ca727beb8ca5
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3b018c9049a92ae64e53915cf1737533
5d486d4715463c19d97c13eab3ccb76d
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7df2e52bcdd52f6b24ead491398bb72a
1b01a2f0092739e163fbfc2ef2060991
a50d07acbc70414c7ffebb68f58d10f3
83aa5b1e5bb44c28f881f80aa083bb82
cc403b1d9bb64e43a53c9e5551e33d0d
6cf121d3d51bab4e7182e12f79946240
f512d625d286be09547b0b176624a71c
4b6ed52b8e3a8a04ccea85a5b1e253f6
43c01438a30fb361116efcfc4277db30
5a4240b13bb6328dcec3eb09253ef213
13bcbbf7f1c309d949d8bd59edfb42d7
a6b16bf0d4b2b5e8411701e0b4d81813
317f2b23c7446a11f8bbf34c9d7191f4
fe8b46e7a51da1e17c182a5490bdb3a6
0051b580d56a213ffb5c1dce9e043a98
1a34bb850d8165063eb83fd69b458277
30754111ce0a4fa5707952f48dc3cf25
46577b6dfe593f0676030c4876981cc1
43e08989493b8931fca8250524581f0e
83f87730a1928ecd7e628c577ebd1de4
c12c4734816c9b2e1b3020f46af996c5
1cd39e43571bbe09b0d435a3e2117408
113a7016c38f5eee2d72b91ee45e0d82
d22a502963b8c65b7e1def97acd458af
a30d563d2db9cb40237a2ef86f7c9d1d
5430933e307ef9ee8079781d14c803ac
b0e32bff980d59cf2ae631c987546240
988d894eeaefda115ff28f5334d08ba7
8d128fc77392d4c236320c2351c045bc
 
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