Gromozon (here as “Newtech, Inc. Panama”), one of the most notorious pieces of spyware out there, is digitally signed by Thawte (part of Verisign). This isn’t the first time spyware has been signed by a certificate authority.
VirusTotal results for this “signed” piece of garbage here.
(Credit to Sunbelt researcher Francesco)
Update: Verison has notified me that the cert is being revoked.