Due to the fact that some firewall trust only the trust that user gives to his application,
it was demonstrated that the fact of just rename a malicious program with the name of an
authorized application could allow it to bypass firewall.
Lastest version of personal firewalls includes a checksum check of application and
warns user when this figerprint is modified.
Meaning
If the test is a success, this means that your firewall trust to your application
by there name (characters) instead of by a crypted fingerprint, for instance an md5 one.
substitution
