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????蘋果操作系統(tǒng)安全性相對較高，我已經(jīng)就該主題發(fā)表過幾篇文章，也從PC用戶那里獲得了很多這樣的反饋【參見《為什么蘋果電腦不會中病毒》（Why are there no Mac viruses）】。因此，我覺得有必要告訴大家，蘋果操作系統(tǒng)目前似乎正在經(jīng)歷迄今為止最為嚴(yán)重的惡意軟件攻擊。

????根據(jù)俄羅斯大蜘蛛防病毒軟件公司（Dr.Web）上周三發(fā)布的一份報(bào)告，稱Flashback木馬已經(jīng)對全球范圍內(nèi)超過55萬臺Mac電腦的安全造成了威脅。

????Dr. Web已經(jīng)針對微軟Windows系統(tǒng)若干種版本的Flashback木馬提供了殺毒程序。它對蘋果電腦遭遇的木馬病毒變種描述如下：

????這種病毒變種會用Java語言代碼來裝載包含漏洞利用（exploit）的Java小應(yīng)用程序，然后把可執(zhí)行文件保存至中毒的Mac電腦硬盤。病毒利用該文件從遠(yuǎn)程服務(wù)器下載惡意負(fù)載并啟動。依照從服務(wù)器獲取的指令，它能獲取并運(yùn)行任何可執(zhí)行文件。

????甲骨文公司（Oracle）在2010年收購太陽微系統(tǒng)公司（Sun Microsystems）后承擔(dān)了Java程序語言的責(zé)任，并于今年2月份發(fā)布了漏洞更新?？萍疾┛虯rs Technica的程雅基稱：“Flashback最新變種的消息流傳開之后，蘋果公司直到上周初才發(fā)布了補(bǔ)救措施?！?/p>

????i該補(bǔ)救措施是蘋果操作系統(tǒng)軟件更新Java for OS X 2012-001的一部分。用戶可以在“系統(tǒng)設(shè)置”下的“軟件更新”中找到。如果要檢查自己的Mac是否中毒，可以根據(jù) F-Secure殺毒軟件的查毒指南，使用“實(shí)用程序文件夾”的“終端應(yīng)用軟件”來排查木馬：

????Having written several times -- and taken a lot of heat from PC users -- about the relative security of Apple's (AAPL) operating systems (See Why are there no Mac viruses), I feel obliged to report that Mac OS X is under what appears to be the most serious malware attack to date.

????According to a report posted Wednesday by Dr. Web, a Russian anti-virus vendor that may have a stick in this fire, the security of more than 550,000 Macs around the world have been compromised by the Flashback trojan.

????Dr. Web, which sells an antidote for the versions of Flashback that run on Microsoft (MSFT) Windows machines, describes the Mac variant like this:

????JavaScript code is used to load a Java-applet containing an exploit... The exploit saves an executable file onto the hard drive of the infected Mac machine. The file is used to download malicious payload from a remote server and to launch it...It may get and run any executable specified in a directive received from a server.

????Oracle (ORCL), which assumed responsibility for the Java programming language when it acquired Sun Microsystems in 2010, released a fix for the vulnerability in February. According to Ars Technica's Jacqui Cheng, "Apple didn't send out a fix until earlier this week, after news began to spread about the latest Flashback variant."

????The fix is part of the OS X software update called Java for OS X 2012-001. You'll find it in Software Update in System Preferences. If you think one of your Macs is infected, F-Secure has instructions on how to use the Terminal application in your Utilities folder to find out: