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    Rootkit Takes Aim at AOL

    By
    Michael Myser
    -
    October 28, 2005
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      Security researchers have identified a rootkit being spread through AOLs popular instant messaging client and AOL chat rooms.

      Bundled within the previously identified W32/Sdbot-ADD worm, the lockx.exe rootkit file is installed when users click on the file link within the IM window.

      Though neither the worm nor the rootkit file are new, it appears to be the worms first foray into the AIM (AOLs Instant Messenger) network.

      Whats more troubling is that rootkits havent previously been spread via IM.

      “This is the first instance of a rootkit coming through the IM vector,” said Tyler Wells, senior director of engineering for FaceTime Communications.

      /zimages/6/28571.gifAOL ships Netscape security patch. Click here to read more.

      “The important thing to watch here is that its no longer single installs or links to Web sites, but adware, spyware and now rootkits [through IM].”

      FaceTime discovered the additional rootkit using IM honeypots monitoring IM networks, Web sites and chat rooms for malicious content and URLs.

      Ero Carrera, a researcher with F-Secure in San Jose, Calif., agreed that its likely the first instance of rootkits happened through IM.

      Foster City, Calif.-based FaceTime said in a statement Friday the rootkit could give an attacker access to and remote control of the PC and may be used to steal information or promulgate more viruses.

      Attackers can automatically pass the worm along to users on the Buddy List. Additionally, the rootkit can shut down anti-virus software, alter the users search page, run CPU usage to 100 percent and automatically download unwanted programs such as 180Solutions, Zango, MaxSearch and others.

      An AOL spokesperson said the company is working on the threat, but couldnt elaborate further.

      FaceTime saw a 20-fold increase in the appearance of worms and viruses on IM clients over last year, and eWEEK.com also reported last month that instant messaging systems have become an increasingly favored target for attackers, with nearly 75 new IM viruses reported in August and September.

      As more and more enterprise users download IM clients, companies open themselves up to widespread attacks.

      “Theres been a huge use of IM on the enterprise, but IT managers are now becoming more and more aware of it,” Wells said. “Their main concern is now IM security.”

      The use of rootkits by hackers has increased as well, and security vendors are starting to include detection and removal solutions in their offerings.

      Rootkits give attackers better capacity to hide their malicious programs from anti-virus techniques, while potentially handing them complete access to hard drives and accounts, and possible remote reach into other computers on the network.

      “Rootkits give the attacker the ability to hide the install on the box,” said Paul Piccard, director of threat research at anti-spyware firm Webroot Software Inc. in Boulder, Colo.

      “They provide an environment to control a machine or install other software without being detected.”

      /zimages/6/28571.gifClick here to read about AOLs launch of a grass roots IM presence campaign.

      Because users must actively click on the file link to install it, FaceTime and other security vendors encourage enterprises to reiterate that employees not execute files from IMs, even if they come from trusted sources.

      In addition, FaceTimes Wells said the companys Enterprise Edition security software and IMAuditor send test questions in response to unsolicited IMs to ensure they havent come from a remotely controlled computer or bot network.

      /zimages/6/28571.gifCheck out eWEEK.coms for the latest security news, reviews and analysis. And for insights on security coverage around the Web, take a look at eWEEK.com Security Center Editor Larry Seltzers Weblog.

      Michael Myser

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