At some time our CiviCRM/Drupal installation has had lots of spam accounts created. As these are over a period of time I can't isolate by date. One tail-tail sign that the accounts are spam is their Civi contact summary has no recorded touch points (activity, contributions, memberships and events). Is there a way to search for contacts that meet this criteria and delete? I've looked at the Find Contacts - Advanced Search but there doesn't appear to be an option for null values. I've also looked at modifying one of the Contact Report Templates which does allow null matches but haven't been able to find a setting that gives the spam accounts.

At some time our CiviCRM/Drupal installation has had lots of spam accounts created. As these are over a period of time I can't isolate by date. One tell-tail sign that the accounts are spam is their Civi contact summary has no recorded touch points (activity, contributions, memberships and events). Is there a way to search for contacts that meet this criteria and delete? I've looked at the Find Contacts - Advanced Search but there doesn't appear to be an option for null values. I've also looked at modifying one of the Contact Report Templates which does allow null matches but haven't been able to find a setting that gives the spam accounts.