Microsoft Excel (Android / Google Play)

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This application is available for Android. This app is designed to provide spreadsheet processor to manage content of files, organize and store all files in one place online as well as offline via official service Microsoft Excel with integrated service OneDrive. The latest build was released on June 16, 2017. Our latest check was performed on Oct 7th, 2016.

Findings Summary

Our examination revealed total 25 items, where were 8 DAR items and 17 DIT items found. Among DAR items were found 0 worst items, 8 bad items, 0 good items, and 0 best items. Among DIT items were found 1 worst item, 0 bad items, 16 good items, and 0 best items.

Below you find 3 infographics summarizing what we described above. Each image provides information about both DAR and DIT items.

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Everything presented below is related to well-known CWEs, such as Sensitive data leakage [CWE-200], Unsafe sensitive data storage [CWE-312], Unsafe sensitive data transmission [CWE-319]. You can read more about it here.

Now let’s go deeper and examine each data item’s protection level.

Application Description

Let’s cite the description of this application below:

The familiar Excel spreadsheet app lets you create, view, edit and share your files with others quickly and easily. It also lets you view and edit workbooks attached to email messages. Work in accounting, auditing, finance or any other field, with anyone, anywhere with confidence. With Excel, your Office moves with you being able to implement the most complex formulas and with amazing features.
Review your accounting, audit or financial analysis or start a budget on the go. Customize your spreadsheet your way with robust formatting tools and great features. Excel gives you the capabilities to build your spreadsheet to meet your specific needs, be it related to finance, accounting or auditing.
Create, calculate and analyze with confidence
Jump-start your budget, task list, accounting or financial analysis with Excel’s modern templates.  Use familiar formulas to run calculations on your data and analyze them. Try rich features and formatting options to make your workbook easier to read and use.  All the spreadsheet features, formats and formulas operate the same way — no matter what device you use Excel in.

Review, edit and work from anywhere
Review your Excel files related to any kind of work, like accounting, auditing or financial, from any device. Edit your data or update your task list from anywhere. There are features like sort and filter columns to focus your review. Create, duplicate, hide and unhide sheets in any workbook.
Tell a story with your data
Insert common charts to bring your data to life. Use features like add and edit chart labels to highlight key insights in your data.
Draw and annotate with ink
Make notes, highlight portions of your worksheet, create shapes, or write math equations using the draw tab feature in Excel on devices with touch capabilities.
Sharing made easy
Share your files with a click of a button to quickly invite others to edit, view or leave comments directly in your workbooks. Copy content from your one worksheet to another with or without formulas. Copy content of your worksheet in the body of an email message with its format intact. Attach or copy a link to your workbook for other sharing options.
REQUIREMENTS

  • OS version: KitKat (4.4.X) or above
  • 1 GB RAM or above

To create or edit documents, sign in with a free Microsoft account on devices with a screen size of 10.1 inches or smaller.
Unlock the full Microsoft Office experience with a qualifying Office 365 subscription (see http://aka.ms/Office365subscriptions) for your phone, tablet, PC and Mac.
Office 365 subscriptions purchased from the app will be charged to your Play Store account and will automatically renew within 24 hours prior to the end of the current subscription period, unless auto-renewal is disabled beforehand. You can manage your subscriptions in your Play Store account settings. A subscription cannot be cancelled during the active subscription period.
Please refer to Microsoft’s EULA for Terms of Service for Office on Android. By installing the app, you agree to these terms and conditions: http://aka.ms/eula

Protection levels.

Locally stored data (Data-at-Rest, DAR).

Locally stored data groups include Application Information, Credentials Information, Documents Information, Storage Information.
The average DAR value is 3.63 points (6.75 points of system protection and 0.50 points of own protection). It is higher than a typical value (3.5 points, where’s 7 points of system protection and 0 points of own protection).

Items’ GROUP #1 with average value 3.50 points (7 points of system protection, 0 points of own protection) means data protection levels have following definitions. Frankly talking, extra data found that shouldn’t be accessed where system protection level means – root/jailbreak is required but not possible without wiping device data, and own protection level means – stored as is.

– Application Events (‘Application Information’ Group) – App events referred to user actions ‘n’ activities were done. This data item related to mentioned group meant to be any info related to the app, app settings, including installed apps or installers,

– Credentials (IDs) (‘Credentials Information’ Group) – Only account IDs like app or 3rd party user IDs including emails, phone number, usernames, etc. (depends on apps). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Local ‘n’ Network Paths (‘Documents Information’ Group) – Paths about local or networks directories, folders, files. This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Application Configs (‘Application Information’ Group) – Different configuration files created by your app, perhaps app permissions. This data item related to mentioned group meant to be any info related to the app, app settings, including installed apps or installers,

– Document List (‘Documents Information’ Group) – The list of documents stored local or synchronized over the Internet. This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Document Details (‘Documents Information’ Group) – Common info about documents synchronized or stored locally (properties like size, date and time, etc.). This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Credentials (Tokens) (‘Storage Information’ Group) – Different tokens used to get access to your account, except for passwords but including app or 3rd party tokens, secret keys, etc. (usually give full access to your account). This data item related to mentioned group meant to be any information referred to storage like credentials, settings, documents and so on

Items’ GROUP #2 with average value 4.50 points (5 points of system protection, 4 points of own protection) means data protection levels have following definitions. Frankly talking, data available if it’s allowed only and may require user action where system protection level means – stored in temporary folders are cleaning from time to time, and own protection level means – the old algorithm, wrong encryption modes, raw encryption, etc.

– Sync Documents (‘Storage Information’ Group) – Documents synchronized or locally stored on your device as is or converted into another file formats (like.pdf or set of separated jpg file per each .pdf file. This data item related to mentioned group meant to be any information referred to storage like credentials, settings, documents and so on

Keep in mind if you’re using some Android devices such Samsung, LG or another device with an unlocked or non-locked loader that allow rooting your device without user action, the system level equals 6 points instead of 7. It means your data can be stolen without involving your actions.

Transferred data (Data-in-Transit, DIT).

Transferred data groups include Analytics ‘n’ Ads Information, Application Information, Credentials Information, Documents Information, Storage Information.
The average DIT value is 4.71 points (5.65 points of system protection and 3.76 points of own protection). It is higher than a typical value (4 points, where’s 4 points of system protection and 4 points of own protection).

Items’ GROUP #1 with average value 5.00 points (6 points of system protection, 4 points of own protection) means data protection levels have following definitions. Frankly talking, data is not available all the time or partially accessed where system protection level means – MITM prevented or fake certificate importing prevented, but plaintext non-protected traffic is intercepted, and own protection level means – bypassed by fake/stolen root certificates.

– Device Data (‘Analytics ‘n’ Ads Information’ Group) – Device ID, Device Name, Device OS Name and Version, and jailbroken/root status. This data item related to mentioned group meant to be any info related to analytics services like Flurry, Google Analytics, etc. or advertisements,

– Application Configs (‘Application Information’ Group) – Different configuration files created by your app, perhaps app permissions. This data item related to mentioned group meant to be any info related to the app, app settings, including installed apps or installers,

– Credentials (IDs) (‘Credentials Information’ Group) – Only account IDs like app or 3rd party user IDs including emails, phone number, usernames, etc. (depends on apps). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Credentials (Passwords) (‘Credentials Information’ Group) – Well-known passwords or PINs you’re using to get access to your account (usually it is worse than tokens because it gives full access to your account). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Credentials (Tokens) (‘Credentials Information’ Group) – Different tokens used to get access to your account, except for passwords but including app or 3rd party tokens, secret keys, etc. (usually give full access to your account). This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Device Data (‘Credentials Information’ Group) – Device ID, Device Name, Device OS Name and Version, and jailbroken/root status. This data item related to mentioned group meant to be any types of credentials including basic (IDs only), passwords, tokens, etc.,

– Document List (‘Documents Information’ Group) – The list of documents stored local or synchronized over the Internet. This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Local ‘n’ Network Paths (‘Documents Information’ Group) – Paths about local or networks directories, folders, files. This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– URLs (‘Documents Information’ Group) – Different types of URLs referred to your files stored in clouds, profiles, social accounts, media files available online, etc. This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Document Details (‘Documents Information’ Group) – Common info about documents synchronized or stored locally (properties like size, date and time, etc.). This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Sync Documents (‘Documents Information’ Group) – Documents synchronized or locally stored on your device as is or converted into another file formats (like.pdf or set of separated jpg file per each .pdf file. This data item related to mentioned group meant to be any documents stored locally, uploaded, downloaded, synchronized in any file format,

– Credentials (Tokens) (‘Analytics ‘n’ Ads Information’ Group) – Different tokens used to get access to your account, except for passwords but including app or 3rd party tokens, secret keys, etc. (usually give full access to your account). This data item related to mentioned group meant to be any info related to analytics services like Flurry, Google Analytics, etc. or advertisements,

– Application Events (‘Application Information’ Group) – App events referred to user actions ‘n’ activities were done. This data item related to mentioned group meant to be any info related to the app, app settings, including installed apps or installers,

– Credentials (Passwords) (‘Storage Information’ Group) – Well-known passwords or PINs you’re using to get access to your account (usually it is worse than tokens because it gives full access to your account). This data item related to mentioned group meant to be any information referred to storage like credentials, settings, documents and so on,

– Credentials (Tokens) (‘Storage Information’ Group) – Different tokens used to get access to your account, except for passwords but including app or 3rd party tokens, secret keys, etc. (usually give full access to your account). This data item related to mentioned group meant to be any information referred to storage like credentials, settings, documents and so on,

– Sync Documents (‘Storage Information’ Group) – Documents synchronized or locally stored on your device as is or converted into another file formats (like.pdf or set of separated jpg file per each .pdf file. This data item related to mentioned group meant to be any information referred to storage like credentials, settings, documents and so on

Items’ GROUP #2 with average value 0.00 points (0 points of system protection, 0 points of own protection) means data protection levels have following definitions. Frankly talking, data ‘as is’ and easily accessed (plaintext, no protection at all) where system protection level means – transferred (or supposed to be) ‘as is’ (plaintext) due to jailbreak/root or preinstalled non-trusted firmware, certificates, etc., and own protection level means – transferred as is, perhaps protection mode turns off or doesn’t exist or info reveal eventually.

– Credentials (IDs) (‘Storage Information’ Group) – Only account IDs like app or 3rd party user IDs including emails, phone number, usernames, etc. (depends on apps). This data item related to mentioned group meant to be any information referred to storage like credentials, settings, documents and so on

Keep in mind if you’re using out-of-date Android < 7.0, the system level equals 4 points instead of 6. It means your data can be stolen with a crafted preinstalled certificate on the device or if someone makes you install a certificate. Also, if you’re using out-of-date Android < 5.0, the system level equals 2 points instead of 4. It means your data can be stolen without involving your actions.

Privacy Policy

Full application privacy policy is available here.

You may find privacy policy details proceeding the link above to compare developer’s vision on data protection with our results.