Threat Descriptons



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Monitoring-Tool:Android/SimChecker.A collects geolocation and other confidential information from a device, and sends out this information via SMS messages and emails.


Once the scan is complete, the F-Secure security product will ask if you want to uninstall the file, move it to the quarantine or keep it installed on your device.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Monitoring-Tool:Android/SimChecker.A is a trojanized SimChecker Pro application that collects geolocation and other confidential information from a device. Upon rebooting the device, this application sends out this stolen information to the author's e-mail address and SMS number that it comes preconfigured with.

Since the trojanized application is already preconfigured by the author, it displays a password prompt to access the configuration UI.

SimChecker.A prompting for a password to be entered

However, even if the user chooses not to access this configuration UI, SimCheck.A will still collect the device's information each time the device reboots. The following are the information that SimCheck.A sends out to the author's SMS number and e-mail address:

Via SMS messages

  • location retrieved through the device's WiFi network, the accuracy, and the street address
  • location retrieved through the device's GPS, the accuracy, and the street address
  • location retrieved through WPS, the accuracy, and the street address

Via emails

  • same location information sent out via SMS messages, plus the altitude, bearing and speed on the GPS location
  • IMSI, if SIM requires PIN to unlock
  • SIM serial number, if SIM does not use PIN
  • Operator code and service provider name
  • Call logs (incoming, outgoing and missed)

To send out emails, SimCheck.A uses the server side script located at https://[...][...]/sendmail.php.

While apps with such behavior may be legitimately used by the device's authorized user, they are classified by security programs as riskware because in the hands of unauthorized users, they can also be used to cause damage to the user's data or the device.

If you are confident that you are aware of the risks involved in using the program and consent to its use, you may choose to keep it installed on your device.

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