The payload in the attacks is a malicious program known as HDD Plus, which is a bogus system analysis and optimization program.
From their blog post on the attack:
Known sites affected: Sites that incorporate DoubleClick or rad.msn.com banners, including for example Scout.com (using DoubleClick), realestate.msn.com, msnbc.com (using both), and mail.live.com. We'd like to note here it's very possible that multiple exchanges, besides those listed here, have been serving the fake ADShufffle's ads.
Notice the three Fs in the name ADShufffle, it's a deft fake of the legitimate AdShuffle.
Here's a list of the exploits and malware used in the attack:
Initially with DoubleClick: 1) Internet Explorer iepeers (CVE-2010-0806)
Later with DoubleClick and rad.msn.com: 2) JDT: Java Web Start Arbitrary command-line injection (CVE-2010-0886) 3) Adobe Reader and Adobe Acrobat 9 GetIcon (CVE-2009-0927) 4) Microsoft MDAC RDS.Dataspace ActiveX (CVE-2006-0003) 5) Adobe Reader and Acrobat 9.x Doc.media.newPlayer () 6) Adobe Acrobat and Reader util.printf (CVE-2008-2992) 7) Adobe Reader GetMailInfo (CVE-2007-5659)
Malware installed: Over the past week, ADShufffle kept on changing the malware. Besides HDD Plus, other types of malware, such as backdoors, have been served. Later in the article we will provide links to our observed binaries.
Exploit packs used: Primarily a modified version of Eleonore. Neosploit was also used. With neosploit, malicious binaries are obfuscated on-the-fly before being served.
Not a trivial attack. And users who visited web sites serving the attack advertising were hit with the payload without having to click on anything; large web sites such as MSBC were affected; the exploits were well obfuscated; and according to Armorize, anti-virus vendors were very poor in initial detection rates.
Because these ads have the potential to be served to millions of web browsers, it's nearly impossible to determine how many people could have been infected. One thing that can be determined with more certainty: expect more of these kinds of attacks.
Such ad networks and other shared services, like web application widgets, have the potential to quickly hit millions of users. My bet is that it is only a matter of time before we see many more similar incidents.
While there's never any good news in such breaches, it's promising DoubleClick, Microsoft, and AdShuffle (the legitimate one) were able to quickly clamp down on the attack.
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