The Malaysia Airlines website was commandeered Monday by hackers who referenced the Islamic State jihadists and claimed to be from the “Lizard Squad”, a group known for previous denial-of-service attacks.

The website’s front page was replaced with an image of a tuxedo-wearing lizard, and read “Hacked by LIZARD SQUAD — OFFICIAL CYBER CALIPHATE”.

It also carried the headline “404 – Plane Not Found”, an apparent reference to the airlines’ puzzling loss of flight MH370 last year with 239 people aboard.

Media reports said versions of the takeover in some regions included the wording “ISIS will prevail”.

The airline did not immediately respond to a request for comment.

The Lizard Squad is a group of hackers that has caused havoc in the online world before, taking credit for attacks that took down the Sony PlayStation Network and Microsoft’s Xbox Live network last month.

The Islamic State, an extremist Sunni Muslim group, has seized large swathes of Syria and Iraq, where it has declared an Islamic “caliphate”.

It has drawn thousands of fighters from across the globe to its anti-Western cause, and shocked the world with its video-taped executions of journalists and other foreigners it has captured, the most recent being a Japanese security contractor it claimed Sunday to have beheaded.

A second Japanese captive being held by the militants has also been threatened with execution.

The IS group, which uses social media in recruiting and spreading its message, is believed to harbour ambitions of launching a cyber-war against the West.

It is unclear why Malaysia Airlines was targeted.

But concern has been rising in Malaysia after scores of its citizens were lured to the IS cause in the Middle East. Malaysian authorities last week said they have detained 120 people suspected of having IS sympathies or planning to travel to Syria.

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Security experts and eBay have confirmed that a recent user database being advertised on Pastebin was not obtained as a result of the data breach suffered by the online marketplace earlier this year.

On May 21, eBay admitted that its corporate network had been breached sometime between late February and early March 2014. The attackers compromised the login credentials of a small number of employees and used the data to gain access to the details of eBay’s 145 million customers. The breach was discovered only in early May.

While there’s no evidence that financial information has been compromised, or that PayPal customers are impacted, the cybercriminals have managed to gain access to names, email addresses, physical addresses, phone numbers, dates of birth and encrypted passwords.

It’s uncertain who is behind the attack, but other cybercriminals and scammers are already trying to profit from the incident. Experts have reported seeing a higher number of PayPal and eBay phishing attacks, and, a post on Pastebin was found offering to sell 145,312,663 eBay customer records for 1.453 Bitcoin (around $ 750).

The seller has published a sample of 12,663 names, password hashes, email addresses, physical addresses, phone numbers and dates of birth allegedly belonging to eBay customers in the Asia-Pacific region.

Both security experts and eBay have analyzed the sample and determined that the data is fake. eBay representatives say none of the credentials appear to belong to customers.

Security expert Kenn White has also analyzed the data and found that it appears to originate from older leaks.

Security blogger Brian Krebs also believes that the data is fake. Allison Nixon, a threat researcher with Deloitte & Touche LLP, has told Krebs that the scammers are most likely hoping that security companies will purchase the data for research purposes.

In its official data breach announcement, eBay failed to disclose how it encrypts customer passwords, but  company representatives have told Reuters that a “sophisticated, proprietary hashing and salting technology” is used to protect them. On Twitter, eBay noted that passwords are hashed and salted, and there is no evidence that the encryption has been broken.

However, users are advised to change their passwords as a precaution. While some have criticized the company for not forcing password resets, as Australian security expert Troy Hunt highlights, that might not be such a good idea.

First of all, if the passwords are stored cryptographically and the company is confident that the information can’t be cracked easily, forcing a reset may be “overkill.” Furthermore, as Hunt explains, resetting the passwords of 145 million people at the same time and asking them to visit the site to set new ones might be too much for eBay’s servers, and it could be like launching a DDOS attack against themselves.

Another important aspect emphasized by Hunt and other security experts is the fact that it took eBay such a long time to detect the breach.

“What I find very distressful is the fact that the breach occurred 2 months ago and they found out just two weeks ago,” IT security expert Sorin Mustaca told SecurityWeek.

As far as disclosing information about the incident, Mustaca noted, “eBay is very careful in what they disclose because they are afraid of being sued. And indeed, I’ve seen in the media that there are already some attempts to sue them over their practices in what the security of the network is concerned.”

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