Unstoppable - Invest In Crypto

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This Android app was first launched on 18th December 2018 and currently has more than 5000 downloads, a 4.6 stars rating from 265 users and the latest release is version 0.16.2.

Our last analysis was done on 2nd October 2020 based on data found in their Google Play description and their website and their source repository. We discuss issues with the provider here. Our verdict was Reproducible when tested (details below).

We found these ways of contacting the developers:

Older reviews (show 5 of 10 reproducible)

Disclaimer

The following Analysis is not a full code review! We plan to make code reviews available in the future but even then it will never be a stamp of approval but rather a list of incidents and questionable coding practice. Nasa sends probes to space that crash due to software bugs despite a huge budget and stringent scrutiny.

Do your own research!

Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.

The Analysis

Here is the output using our test script on the binary from Google Play:

Results:
appId:          io.horizontalsystems.bankwallet
signer:         c1899493e440489178b8748851b72cbed50c282aaa8c03ae236a4652f8c4f27b
apkVersionName: 0.16.2
apkVersionCode: 32
apkHash:        6a4bb767a47990feaa3a844a9b84c0c674b7b575a9d1f9699e0a8bd4152ab4ed

Diff:
Files /tmp/fromPlay_io.horizontalsystems.bankwallet_32/apktool.yml and /tmp/fromBuild_io.horizontalsystems.bankwallet_32/apktool.yml differ
Files /tmp/fromPlay_io.horizontalsystems.bankwallet_32/original/META-INF/MANIFEST.MF and /tmp/fromBuild_io.horizontalsystems.bankwallet_32/original/META-INF/MANIFEST.MF differ
Only in /tmp/fromPlay_io.horizontalsystems.bankwallet_32/original/META-INF: RELEASEK.RSA
Only in /tmp/fromPlay_io.horizontalsystems.bankwallet_32/original/META-INF: RELEASEK.SF

That’s how it should look like to give it the verdict: reproducible.

Verdict Explained

Reproducible when tested At the time of this analysis, the app on Google Play was reproducible from the code provided by the developers!

The app can be independently verified. If the provider puts your funds at risk on purpose or by accident, security researchers can see this if they care to look. It also means that inside the company engineers can verify that the release manager is releasing the app based on code known to all engineers on the team. A scammer would have to work under the potential eyes of security researchers. He would have to take more effort in hiding any exploit.

"Reproducible" does not mean "verified". There is good reason to believe that security researchers as of today would not detect very blatant backdoors in the public source code before it gets exploited, much less if the attacker takes moderate efforts to hide it.

To understand why some lines of difference are ok and others not one has to consider how app signing works. Android supports currently 3 signing schemes and in version 1 signing the signature is put inside the application file. As the tester must not have the release signing key, those files necessarily are missing or differ from the version on Google Play. The file "apktool.yml" was never part of the app and is generated by the analysis tool "apktool".