Be sure to change your default passwords!

As the Bavarian State Criminal Police Office warns, 119 cases of telephone system hacking were recorded from January to May 2018 with a total loss of 500,000 euros.

The stitch:

The perpetrators gain control over the voice mail system (mailbox) of extensions of a telephone system via remote access. Standard passwords are freely available in the phone manufacturers' online user manuals and can easily be cracked by perpetrators.

Using remote access to the voice mail system, call number redirections are set up to chargeable value-added service numbers abroad that have been rented by the perpetrators.

The perpetrators' telephone computers are used to dial the reprogrammed voice mail system at short intervals and forward the call forwarding directly to the stored value-added service number.

Paid connections are set up, which add to the injured party's telephone bill. In order to make as big a profit as possible, the perpetrators usually strike on weekends, at night or on public holidays.

This is how you protect yourself from it:

  • Change preset manufacturer passwords
  • Avoid commonly used default passwords
  • Limit the maximum number of incorrect password entries
  • Check telephone systems regularly for unauthorized call diversions
  • deactivate unused mailboxes or block remote access completely
  • Remove unused phones from the network
  • deactivate the option for international calls to extensions without need
  • If not required, have call-by-call calls blocked by the telephone network provider. This prevents the perpetrators from being able to establish connections abroad via this detour

Important!

In the event of damage, report it immediately to enable effective prosecution and to ensure timely preservation of evidence crucial to the investigation!


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