Sony is reportedly planning to issue a patch later this month which will remove software installed by its Micro Vault USB thumb drives.
F-Secure claimed that several Micro Vault drives equipped with fingerprint readers installed drivers which behaved like rootkits.
The researchers claimed that the behaviour of the software could allow an attacker to deliver malicious payloads without the user's knowledge.
The reports brought back memories of Sony's 2005 XCP scandal, in which DRM rootkits were found embedded in the company's music CDs.
F-Secure said that it has spoken to Sony and that the company has asked for the security firm's research notes on the matter.
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