Apple fans are warned to watch out for packages which claim to be the Greenpois0n jailbreak tool for iOS 4.1 on iPhone, iPod Touch, and iPad - they're all virus-infested fakes.
According to a spokesman from security specialist Kaspersky: "We’ve seen a number of fake 'Greenpois0n' Trojans" which are being uploaded to file-sharing sites and BitTorrent trackers in the hope that unsuspecting iOS users will download them - and get themselves infected with some nasty-ware.
When executed, the fake jailbreakers stay resident in the background - even between reboots - and harvest passwords for social networking sites, on-line banking sites, and MMO gaming services, returning them to a central server for the miscreants behind the tool to exploit.
Some Greenpois0n scammers have taken the process a step further, setting up web sites where you can buy the utility - only to receive a non-working fake at best and, at worst, to have paid real money to infect your system with a password-stealing trojan.
While there will be a genuine jailbreak tool released under the name Greenpois0n, it's not actually out yet - so if you're searching for it, you'll just have to be patient and resist the urge to download any of the versions currently being distributed in the hopes that it's the real McCoy.