The Symbian Foundation has acknowledged that its process for keeping malicious applications off Symbian OS-based phones needs improvement, after a Trojan horse program passed a security test.

The botnet-building Trojan, which calls itself "Sexy Space," passed through the group's digital-signing process, Symbian's chief security technologist Craig Heath said Thursday. Heath said the group is working on improving its security-auditing procedure.

"When software is submitted, we do try to filt...