Mac OS X targeted by Trojan and backdoor tool

Mac OS X targeted by Trojan and backdoor tool

Summary: Two new pieces of malware affecting OS X appeared this week, a Trojan horse and a hacker tool for creating backdoors

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TOPICS: Security
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Two pieces of malicious software affecting Apple's Mac OS X appeared this week: a Trojan horse with the ability to download and install malicious code of an attacker's choice, and a hacker tool for creating backdoors, according to security vendors.

The Trojan — called 'OSX.RSPlug.D' by Intego, the Mac security specialist that discovered the threat — is a variant on an older piece of malicious code but with a new installer, Intego said.

"It is a downloader, and it contacts a remote server to download the files it installs," Intego said in an advisory. "This means that, in the future, the downloader may be able to install payloads [other] than the one it currently installs."

In other respects the Trojan is similar to previous versions of RSPlug, which first surfaced in October 2007, Intego said. It installs a piece of malicious code known as DNSChanger, which routes the user's internet traffic through a malicious DNS server, leading users to phishing websites or pages displaying advertisements.

The Trojan is found on porn websites posing as a codec needed to play video files, a technique used to trick the user into downloading and installing it.

Intego said OSX.RSPlug.D has been widely confused with a separate threat publicised this week by several security firms. That threat is called OSX.TrojanKit.Malez by Intego and OSX.Lamzev.A by other vendors, including Symantec and Trend Micro.

OSX.Lamzev.A is a hacker tool designed primarily to allow attackers to install backdoors in a user's system, according to Intego. However, the company dismissed the tool as a serious threat because a potential hacker has to have physical access to a system to install the backdoor.

"Unlike true malware and Trojan horses, OSX.TrojanKit.Malez requires that a hacker already have access to a Mac in order to install the code," Intego stated.

Other antivirus vendors noted that Lamzev could be disguised as a piece of legitimate software and used to trick users into creating the backdoor themselves.

Lamzev is not related to RSPlug, despite several high-profile reports confounding the two, Intego emphasised. "This hacker tool has nothing to do with the RSPlug Trojan horse," Intego stated.

Security vendors have long warned that the Mac platform is not as secure as some users might like to believe. Apple had not responded to a request for comment at the time of publication.

Topic: Security

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  • P r 0 n

    I think many mac users wonder just how much of a threat these genuinely pose and how 'security wise' one can protect oneself from them. Not to mention just what would need to be done other than never launching an application, which near as I can tell is one of the main things a computer is designed to do.

    Having deliberately infected a spare machine here some hours ago it's clear the user has to go through all the same steps as normal software thus it can't just install itself without 3 mouse clicks.

    Does anyone know if definitions have been added to ClamAV for this latest variation?

    And to be honest, it you're browsing porn sites, maybe you're getting what you deserve :)
    Win3.1