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Mac Defender
Mac Defender (also known as Mac Protector, Mac Security,〔Mac Guard,〔(【引用サイトリンク】date=25 May 2001 )〕 Mac Shield, and FakeMacDef)〔(【引用サイトリンク】url=http://www.f-secure.com/v-descs/rogue_osx_fakemacdef_a.shtml )〕 is an internet rogue security program that can be installed by unwitting users of computers running the Mac OS X operating system. The Mac security firm Intego discovered the fake antivirus software on 2 May 2011, with a patch not being provided by Apple until 31 May. The software has been described as the first major malware threat to the Macintosh platform (although it does not attach to or damage any part of OS X).〔(【引用サイトリンク】date=4 May 2011 )〕〔(【引用サイトリンク】url=http://www.left-click.us/news/blog/mac-defender )〕〔(【引用サイトリンク】url=http://crave.cnet.co.uk/software/mac-defender-fake-antivirus-software-is-first-major-attack-on-apple-computers-50003812/ )〕 However, it is not the first Mac-specific Trojan, and is not self-propagating.
Users typically encounter the program when opening an image found on a search engine. It appears as a pop-up indicating that viruses have been detected on the users' computer and suggests they download a program which, if installed, provides the users' personal information to unauthorized third parties.
The software has been traced through German websites, which have been closed down, to the Russian online payment ChronoPay. AppleCare employees were told not to assist callers in removing the software, but Apple later promised a software patch.〔(【引用サイトリンク】date=25 May 2011 )〕 The Mac OS X security update 2011-003 was released on 31 May 2011, and includes not only an automatic removal of the trojan, and other security updates, but a new feature that automatically updates malware definitions from Apple.〔(【引用サイトリンク】url=http://support.apple.com/kb/HT4657 )〕
==Symptoms==
The program appears in malicious links spread by search engine optimization poisoning on sites such as Google Image Search.〔 When a user accesses such a malicious link, a fake scanning window appears, originally in the style of a Windows XP application,〔 but later in the form of an "Apple-type interface". The program falsely appears to scan the system's hard drive. The user is then prompted to download a file that installs Mac Defender, and is then asked to pay US$59.95 to US$79.95 for a license for the software.〔〔 Rather than protect against viruses, Mac Defender hijacks the user's Internet browser to display sites related to pornography, and also exposes the user to identity theft (by passing on credit card information to the cracker).〔 A newer variant installs itself without needing the user to enter a password.〔(【引用サイトリンク】publisher=The Mac Security Blog » INTEGO SECURITY MEMO )〕 All variants require the user to actively click through an installer to complete installation even if a password is not required.〔(【引用サイトリンク】publisher=The Mac Security Blog » INTEGO SECURITY MEMO )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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