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オーストラリアやニュージーランドで、多くのユーザーの Apple ID が侵害されています。Apple サポートコミュニティやソーシャルネットワークでは、Apple 社製のデバイスがリモートからロックされ、Oleg Pliss（Oracle 社のソフトウェアエンジニア）と名乗る人物から身代金を要求されたという報告が見られます。攻撃者は、ランダムに選んだ Oleg 氏に罪を着せようとしているようです。
図 1. ロックされた iPhone の身代金要求メッセージ
Apple 社製デバイスで発生している現象
最初に寄せられた報告によると、多くの Apple ID が侵害され、それらの Apple ID を使って iPhone、iPad、Mac がロックされました。Apple ID がどのように侵害されたのか正確にはわかっていませんが、フィッシング攻撃や脆弱なパスワード、パスワードの使い回しなどが原因の可能性があります。Apple 社のサイトや iCloud にサインインするための電子メールやパスワードに関する別のデータ侵害によって Apple ID の侵害が引き起こされた可能性もあります。
攻撃者は、侵害された Apple ID を使って iCloud の「iPhone を探す」機能にアクセスできます。この機能を使うと、インターネットに接続されているデバイスの所在地を特定したり、「紛失モード」機能を有効にしたりすることができます。「紛失モード」機能を有効にすると、攻撃者は、サウンドの再生、デバイスのロック、身代金要求メッセージの表示などをリモートから実行できます。
どのような場合でも、身代金は支払わないでください。身代金を支払っても、攻撃者がデバイスのロックを解除してくれる保証はありません。
侵害された Apple ID への対処方法
デバイスがロックされたのは、Apple ID が侵害されたことが原因です。まずは Apple ID アカウントにサインインして、パスワードが勝手に変更されていないことを確認する必要があります。変更されていなかったら、すぐにパスワードを変更してアカウントを保護してください。念のため、変更した後に iCloud アカウントにサインインしてから、すべてのブラウザで iCloud からサインアウトしてください。
ロックされたデバイスへの対処方法
侵害が発生する前にデバイスにパスコードを設定していた場合には、パスコードを入力すればロックを解除できます。
しかし、パスコードを設定していなかった場合、ロックは解除されません。これは、攻撃者が「紛失モード」機能を有効にするときに、デバイスにパスコードを設定する必要があるためです。この場合は、Apple サポートに連絡してサポートを受ける必要があります。ただし、多くのユーザーからの報告によると、デバイスを復元するためには、デバイスをワイプしてバックアップから復元するしか方法がありません。
Apple ID とデバイスを保護する方法
今回の攻撃による被害を受けていない場合でも、Apple ID とデバイスを保護するために、次のセキュリティ対策を確認して実施しておくことをお勧めします。
* 日本語版セキュリティレスポンスブログの RSS フィードを購読するには、http://www.symantec.com/connect/ja/item-feeds/blog/2261/feed/all/ja にアクセスしてください。
Many users in Australia and New Zealand have had their Apple IDs compromised. We are seeing reports on Apple’s support community and social networks that their Apple devices are being remotely locked and held for ransom by someone claiming to be Oleg Pliss, a software engineer at Oracle, who the attackers randomly chose to pin this attack on.
Figure 1. Locked iPhone ransom message
What happened to my Apple device?
Based on initial feedback, a number of Apple IDs have been compromised and used to lock iPhones, iPads, and Macs. It remains unclear exactly how the Apple IDs were compromised, but possible explanations include phishing attempts, weak passwords, or password reuse. A separate breach involving emails and passwords used to login to Apple and iCloud could have facilitated the compromise of the Apple IDs.
Once an Apple ID is compromised, attackers can access the Find My iPhone feature in iCloud. This feature is used to locate your devices if they have an internet connection and turn on the Lost Mode feature. Once Lost Mode is turned on, the attacker can remotely play a sound, lock the device, and display a ransom message.
Whatever you do, do NOT pay the ransom. There is no guarantee that the criminals responsible will unlock your device.
How to deal with a compromised Apple ID
While your devices have been locked, the root issue is the compromise of your Apple ID. First, you should login to your Apple ID account and confirm that your password has not been changed. If it has not, you should immediately secure the account by changing your password. Once changed, make sure you login to your iCloud account and sign out of all browsers just to be safe.
How to deal with a locked device
If you had set a passcode on your device prior to the compromise, you can simply unlock it by inputting your passcode.
However, if you did not set a passcode on your device, then your phone will remain locked. This is because the attacker is required to set a passcode for your device when enabling the Lost Mode feature. In this scenario, you should call Apple support for further assistance. However, most users are reporting that the only option to recover the device is to wipe the device and restore it from a backup.
How to secure your Apple ID and devices
Even if this did not impact you directly, it is a good time to review and implement the following security measures to protect your Apple ID and devices.
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