'Darkhotels' threat still active, Kaspersky Lab warns

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'Darkhotel' hits its targets while they are staying in luxury hotels. The crew never goes after the same target twice; they perform operations with surgical precision, getting all the valuable data they can from the first contact, deleting traces of their work and melting into the background to await the next high-profile individual. The most recent travelling targets include top executives from the US and Asia doing business and investing in the APAC region: CEOs, senior vice-presidents, sales and marketing directors and top R&D staff have all been targeted. Who will be next? This threat actor is still active, Kaspersky Lab warns.

The Darkhotel actor maintains an effective intrusion set on hotel networks, providing ample access over the years, even to systems that were believed to be private and secure. They wait until, after check-in, the victim connects to the hotel Wi-Fi network, submitting his room number and surname at the log in. The attackers see him in the compromised network and trick him into downloading and installing a backdoor that pretends to be an update for legitimate software: Google Toolbar, Adobe Flash or Windows Messenger. The unsuspecting executive downloads this hotel 'welcome package', only to infect his machine with a backdoor, Darkhotel's spying software.

Advanced stealing tools

Once on a system, the backdoor has been and may be used to further download more advanced stealing tools: a digitally signed advanced keylogger, the Trojan 'Karba' and an information-stealing module. These tools collect data about the system and the anti-malware software installed on it, steal all keystrokes, and hunt for cached passwords in Firefox, Chrome and Internet Explorer; Gmail Notifier, Twitter, Facebook, Yahoo! and Google log-in credentials; and other private information. Victims lose sensitive information - likely the intellectual property of the business entities they represent. After the operation, the attackers carefully delete their tools from the hotel network and go back into hiding.

Commenting on Darkhotel, Kurt Baumgartner, Principal Security Researcher at Kaspersky Lab, said: "For the past few years, a strong actor named Darkhotel has performed a number of successful attacks against high-profile individuals, employing methods and techniques that go well beyond typical cybercriminal behaviour. This threat actor has operational competence, mathematical and crypto-analytical offensive capabilities, and other resources that are sufficient to abuse trusted commercial networks and target specific victim categories with strategic precision."

However, Darkhotel malicious activity can be inconsistent: it is indiscriminate in its spread of malware alongside its highly targeted attacks. Read more about these specific malware delivery vectors here.

"The mix of both targeted and indiscriminate attacks is becoming more and more common in the APT scene, where targeted attacks are used to compromise high-profile victims, and botnet-style operations are used for mass surveillance or performing other tasks, such as DDoSing hostile parties or simply upgrading interesting victims to more sophisticated espionage tools," added Kurt Baumgartner.

Kaspersky Lab researchers indicated that the attackers left a footprint in a string within their malicious code pointing to a Korean-speaking actor. Kaspersky Lab's products detect and neutralise the malicious programmes and their variants used by the Darkhotel toolkit. Kaspersky Lab is currently working with relevant organisations to mitigate the problem.

How to outsmart Darkhotel

When travelling, any network, even semi-private ones in hotels, should be viewed as potentially dangerous. The Darkhotel case illustrates an evolving attack vector: individuals who possess valuable information can easily fall victim to Darkhotel itself, as it is still active, or to something similar to a Darkhotel attack. To prevent this, Kaspersky Lab has the following tips: