for our commercial OLB portal, when we are alerted to malware (and we have a service that scans and alerts) on a client computer, we suspend the access of the business and will not re-instate until they provide certification that malware was removed.
we do nothing for retail OLB portal regarding malware, but do give them the option of downloading a 3rd party detection software. if someone has too many instances of issues with retail OLB fraud, we look to remove them as customers (and this does not relate solely to malware, but also if their credentials are compromised in other methods).
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Providing alternative truths since the invention of time