The Koala application has beeen signed with a certificate from EVOGH, inc.
Information on the certificate:

Issuer: VeriSign

Valid to: Sat Dec 01 15:59:59 PST 2012

MD5: CA:01:29:51:2D:86:89:49:1C:94:6C:56:AC:ED:0E:F1

SHA1: 71:74:61:23:33:C3:D4:6F:A3:62:0B:1B:E1:D3:76:E9:FF:66:0F:ED