The app is mainly used in Germany as a local trading platform. A website is also offered. The Android app is available in the Google PlayStore and also at apkpure.com.
Data backups used for analysis
Folder structure found in the data backups
The following folders were examined in detail in the analysis
• \data\data\com.ebay.kleinanzeigen\*
• \data\media\0\Android\data\com.ebay.kleinanzeigen\*
• \data\user_de\0\com.ebay.kleinanzeigen\*
The following files with interesting content were identified here.
• \data\data\com.ebay.kleinanzeigen\shared_prefs\com.ebay.kleinanzeigen_preferences.xml
• \data\data\com.ebay.kleinanzeigen\files\NON_RESETTABLE_RECENT_SEARCHES_CACHE
• \data\data\com.ebay.kleinanzeigen\files\RECENT_SEARCHES_CACHE
• \data\data\com.ebay.kleinanzeigen\databases\messageBoxDatabase.db
\data\data\com.ebay.kleinanzeigen\databases\messageBoxDatabase.db-shm
\data\data\com.ebay.kleinanzeigen\databases\messageBoxDatabase.db-wal
The file com.ebay.kleinanzeigen_preferences.xml contains some information about the account used. These data are e.g.
<string name="LAST_EMAIL_USED">email@adress.com</string>
<string name="AUTH_USER_EMAIL">email@adress.com</string>
<string name="USERPROFILE_TRACKING_USER_ACCOUNT_TYPE">private</string>
<string name="AUTH_USER_ID">1000000</string>
<string name="USERPROFILE_LOCATION_LONGITUDE_KEY">13.520000</string>
<string name="USERPROFILE_LOCATION_LATITUDE_KEY">52.4600000</string>
<string name="USERPROFILE_NAME_KEY">Rudi</string>The RECENT_SEARCHES_CACHE and NON_RESETTABLE_RECENT_SEARCHES_CACHE files contain JSON data records for the last searches carried out in the app.
{"searchTerm":"apple time capsule","category":{"id":"0","localizedName":"Alle Kategorien","internalName":"Alle Kategorien","hasFakeSubCategory":false,"idAsInt":0},"termSearchTimestamp":1709883798862},
The database file messageBoxDatabase.db contains the following tables
The "conversations" table is interesting here.This is structured as follows:
{"displayImageUrl":"https://img.kleinanzeigen.de/api/v1/prod-ads/images/0a/0a3e00c3-2578-4ed1-9de9-4da78be08bce?rule\u003d$_12.JPG","displayPrice":"","displayTitle":"Meine Kleinanzeige","identifier":"1234567890","poster":{"identifier":"87654321","imageUrl":"","name":"User Seller"}}
This counterparty information is also stored as a JSON data record in the "counterParty" column. The "identifier" value contains the unique user ID and the displayed user name.
{"identifier":"87654321","imageUrl":"","name":"User Seller"}
The very interesting part of the "conversations" table is the "messages" column. Here too, the data is available as JSON. Each new message is added to the value already saved.
{"attachments":[{"mimeType":"image/jpeg","url":"https://api.ebay-kleinanzeigen.de/api/users/1089969/conversation-attachments?messageId\u003d3ded2722-ae46-11ee-8f31-0ff44f34ecac\u0026filename\u003dek-yams-6276062e7f7845c1b6dea7544ebde9ad-977E3451-E4A3-445E-9A23-0A3A8516863E.jpg"}],"identifier":"3ded2722-ae46-11ee-8f31-0ff44f34ecac","sender":"COUNTER_PARTY","sortByDate":"Mon, 08 Jan 2024 17:52:00.704 GMT+01:00","state":"DELIVERED","text":"Viel Spaß damit"}The time of the message can be seen in the "sortByDate" object. The text of the message is saved in "text". Attachments (e.g. images) can also be added to the messages in the app. According to my analysis, these are not saved on the device, but are downloaded via API access when the messages are retrieved in the app. The path and the mime type are stored in the "attachments" object. In the "sender" object, the device owner can be linked with "ME" and the other party with "COUNTER_PARTY". The status of the message is stored in the "state" object. This data can be used to reconstruct the message history. Another object is "warning" with the sub-objects "links" and "message". A warning with the "message" and the "links" is displayed in the app.
A view on the smartphone can look like this
The evaluation with aLEAPP looks as follows:
Message overview
View in the navigation
I am available for questions and suggestions. 🖐🖐
My Linkedin Profile: https://www.linkedin.com/in/bruno-fischer-5b4a182b1/