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Updated documentation on mvt-android

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2021-08-17 16:36:48 +02:00
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# Checking SMSs from Android backup
# Check an Android Backup (SMS messages)
Some attacks against Android phones are done by sending malicious links by SMS. The Android backup feature does not allow to gather much information that can be interesting for a forensic analysis, but it can be used to extract SMSs and check them with MVT.
Android supports generating a backup archive of all the installed applications which supports it. However, over the years this functionality has been increasingly abandoned in favor of enabling users to remotely backup their personal data over the cloud. App developers can therefore decide to opt out from allowing the apps' data from being exported locally.
To do so, you need to connect your Android device to your computer. You will then need to [enable USB debugging](https://developer.android.com/studio/debug/dev-options#enable>) on the Android device.
At the time of writing, the Android Debug Bridge (adb) command to generate backups is still available but marked as deprecated.
If this is the first time you connect to this device, you will need to approve the authentication keys through a prompt that will appear on your Android device.
That said, most versions of Android should still allow to locally backup SMS messages, and since messages are still a prime vehicle for phishing and malware attacks, you might still want to take advantage of this functionality while it is supported.
Then you can use adb to extract the backup for SMS only with the following command:
## Generate a backup
Because `mvt-android check-backup` currently only supports checking SMS messages, you can indicate to backup only those:
```bash
adb backup com.android.providers.telephony
```
You will need to approve the backup on the phone and potentially enter a password to encrypt the backup. The backup will then be stored in a file named `backup.ab`.
In case you nonetheless wish to take a full backup, you can do so with
You will need to use [Android Backup Extractor](https://github.com/nelenkov/android-backup-extractor) to convert it to a readable file format. Make sure that java is installed on your system and use the following command:
```bash
java -jar ~/Download/abe.jar unpack backup.ab backup.tar
adb backup -all
```
## Unpack the backup
In order to reliable unpack th [Android Backup Extractor (ABE)](https://github.com/nelenkov/android-backup-extractor) to convert it to a readable file format. Make sure that java is installed on your system and use the following command:
```bash
java -jar ~/path/to/abe.jar unpack backup.ab backup.tar
tar xvf backup.tar
```
(If the backup is encrypted, the password will be asked by Android Backup Extractor).
If the backup is encrypted, ABE will prompt you to enter the password.
## Check the backup
You can then extract SMSs containing links with MVT:
```bash
$ mvt-android check-backup --output . .
$ mvt-android check-backup --output /path/to/results/ /path/to/backup/
16:18:38 INFO [mvt.android.cli] Checking ADB backup located at: .
INFO [mvt.android.modules.backup.sms] Running module SMS...
INFO [mvt.android.modules.backup.sms] Processing SMS backup
file at ./apps/com.android.providers.telephony/d_f/000
000_sms_backup
INFO [mvt.android.modules.backup.sms] Processing SMS backup file at /path/to/backup/apps/com.android.providers.telephony/d_f/000000_sms_backup
16:18:39 INFO [mvt.android.modules.backup.sms] Extracted a total of
64 SMS messages containing links
```