More Details on "Operation Aurora"
January 14th, 2010
Earlier today, George Kurtz posted an entry, 'Operation "Aurora" Hit Google, Others', on the McAfee's Security Insight blog The purpose of this blog is to answer questions about this particular attack; fill in some of the threat flow and McAfee coverage details.
How were systems compromised?
When a user manually loaded/navigated to a malicious web page from a vulnerable Microsoft Windows system, JavaScript code exploited a zero-day vulnerability in Internet Explorer; Microsoft Internet Explorer DOM Operation Memory Corruption Vulnerability. Microsoft has released Security Advisory (979352) for this vulnerability (CVE-2010-0249).
What was the payload of the exploit?
Once a system was successfully compromised, the exploit was designed to download and run an executable from a site, which has since been taken offline. That executable installed a remote access Trojan to load at startup. This Trojan also contacted a remote server. This allowed remote attackers to view, create, and modify information on the compromised system.
How wide-spread is this attack?
Aurora appears to have been a very concentrated attack on specific targets. It is not believed to be widespread at this time.
How serious is this vulnerability?
The Microsoft Internet Explorer vulnerability leveraged in this attack allows for remote code execution, but does require user intervention (such as following a hyperlink to a website, or opening an email attachment, etc). Furthermore, the single exploit known to exist can be thwarted by Data Execution Prevention (DEP), enabled by default in Internet Explorer 8 and optionally in Internet Explorer 7. Microsoft lists the following combinations to be vulnerable: Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4, and Internet Explorer 6, Internet Explorer 7 and Internet Explorer 8 on supported editions of Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 are affected.
How are McAfee customers protected from this attack?
McAfee DAT files (antivirus): Coverage will be provided for associated malware (as Exploit-Comele, Roarur.dr, and Roarur.dll in the 5862 DATs, releasing January 15. Partial coverage is provided in the current (5861) DATs for some components as Generic.dx!kwv, Generic Spy.e, Spy-Agent.ey, and Exploit-Comele.
McAfee VirusScan Enterprise Buffer Overflow Protection: Generic Buffer Overflow Protection is expected to cover some, but not all, exploits.
McAfee Host Intrusion Prevention: Generic Buffer Overflow Protection is expected to cover some, but not all, exploits.
McAfee Network Security Platform: The UDS release of January 14 contains the signature "UDS-HTTP: Microsoft Internet Explorer HTML DOM Memory Corruption" which provides coverage.
McAfee Vulnerability Manager: The FSL/MVM package of January 14 includes a vulnerability check to assess if your systems are at risk.
Updated coverage information will be communicated through McAfee Security Advisories:
http://www.mcafee.com/us/threat_center/securityadvisory/signup.aspx
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