LulzSec's Parting Trojan is a False Positive

The LulzSec hacking group sailed off into the sunset Saturday, leaving behind a treasure trove of stolen data along with what some antivirus programs identified as a nasty surprise for anyone who downloaded the Torrent file: a Trojan horse program.

The LulzSec hacking group sailed off into the sunset Saturday, leaving behind a treasure trove of stolen data along with what some antivirus programs identified as a nasty surprise for anyone who downloaded the Torrent file: a Trojan horse program.

But not so fast. On Monday several antivirus vendors took a close look at the file in question and decided that the program wasn't actually harmful. Consider it an inadvertent parting prank on the security industry the hacking grew took such delight in tormenting. More Lulz for the Lulz Boat.

Early in the day, 26 of the 42 security companies whose scanning products can be tested on the VirusTotal Web site reported that a file within LulzSec's "AT&T internal data" folder was malware, designed to give hackers remote access to the victim's computer.

But by Monday night Kaspersky Lab, McAfee and Trend Micro all reported that this was incorrect. According to Roel Schouwenberg, a researcher at Kaspersky Lab, other companies are flagging the file as a Trojan because it used pirated WinRar compression software that made the file look very similar to known malicious programs. These pirated compression programs are often used to compress malicious files and "a lot of companies are quite aggressive with these detections," he said in an interview.

In its final press release, LulzSec blamed the whole thing on AT&T, warning readers not to open the file and saying, "it is malware (due to AT&T using a pirated copy of WinRar)"

The file in question has reportedly been pulled from the LulzSec torrent, but the incident added to the chaos and confusion that the LulzSec crew seemed to love leaving in its wake.

LulzSec took particular pleasure in causing trouble for security companies, especially those it saw as aiding its enemies -- such as Prolexic, a provider of denial-of-service attack mitigation services, thought to be securing Sony's networks, and Endgame Systems, a company with links to the U.S. Central Intelligence Agency. The hackers released dox -- dossiers of information including phone numbers, addresses and online profiles of the executives at these companies and their family members.

They also hit two Infraguard websites, set up by the U.S. Federal Bureau of Investigation to encourage corporate security teams to share information with each other and the federal government.

LulzSec said it was taking aim at "the government and whitehat security terrorists across the world. With their very public hacking and data dumps, they also caused problems for security staffers at the companies they broke into. But the group blamed its victims for not patching their security flaws. "When Sony and FBI affiliates fail to protect themselves against entry-level haxing, there's a problem," LulzSec said in a June 19 Twitter message.

"Their whole objective was chaos and I think they've done a pretty good job at that," said Gary Warner, director of research in computer forensics at the University of Alabama at Birmingham.

But there are important lessons for the security industry too, he said.

According to him, LulzSec showed that many organizations just don't do a good enough job of testing out their systems in real-world attack scenarios. "What we're seeing is a great illustration that we haven't done a good job of testing our security," he said.

LulzSec also proved that even though everyone knows better, people -- even security professionals -- still reuse passwords.

That's got to change, Warner said. "It's just not acceptable to use the same password on a Sony Pictures Sweepstakes page as you use for your Hotmail account and your bank account."

Robert McMillan covers computer security and general technology breaking news for The IDG News Service. Follow Robert on Twitter at @bobmcmillan. Robert's e-mail address is robert_mcmillan@idg.com

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