The “Mask": Kaspersky Lab discovers advanced global cyber-espionage operation

Main findings:

• The authors appear to be native in the Spanish language, which has been observed very rarely in APT attacks.
• The campaign was active for at least five years until January 2014 (some Careto samples were compiled in 2007). During the course of Kaspersky Lab’s investigations, the command-and-control (C&C) servers were shut down.
• Kaspersky researchers counted over 380 unique victims between 1000+ IPs. Infections have been observed in: Algeria, Argentina, Belgium, Bolivia, Brazil, China, Colombia, Costa Rica, Cuba, Egypt, France, Germany, Gibraltar, Guatemala, Iran, Iraq, Libya, Malaysia, Mexico, Morocco, Norway, Pakistan, Poland, South Africa, Spain, Switzerland, Tunisia, Turkey, United Kingdom, United States, and Venezuela.
• The complexity and universality of the toolset used by the attackers makes this cyber-espionage operation very special. This includes leveraging high-end exploits, an extremely sophisticated piece of malware, a rootkit, a bootkit, Mac OS X, and Linux versions and possibly versions for Android and iPad/iPhone (iOS). The Mask also used a customised attack against Kaspersky Lab’s products.
• Among the attack’s vectors, at least one Adobe Flash Player exploit (CVE-2012-0773) was used. It was designed for Flash Player versions prior to 10.3 and 11.2. This exploit was originally discovered by VUPEN and was used in 2012 to escape the Google Chrome sandbox to win the CanSecWest Pwn2Own contest.

Infection methods and functionality
According to Kaspersky Lab’s analysis report, the Mask campaign relies on spear-phishing e-mails with links to a malicious website. The malicious website contains a number of exploits designed to infect the visitor, depending on system configuration. Upon successful infection, the malicious website redirects the user to the benign website referenced in the e-mail, which can be a YouTube movie or a news portal.

It is important to note the exploit websites do not automatically infect visitors; instead, the attackers host the exploits at specific folders on the website, which are not directly referenced anywhere, except in malicious e-mails. Sometimes, the attackers use subdomains on the exploit websites, to make them seem more real. These subdomains simulate subsections of the main newspapers in Spain plus some international ones for instance, the Guardian and the Washington Post.

The malware intercepts all the communication channels and collects the most vital information from the infected system. Detection is extremely difficult because of stealth rootkit capabilities.

Careto is a highly modular system; it supports plugins and configuration files, which allow it to perform a large number of functions. In addition to built-in functionalities, the operators of Careto could upload additional modules that could perform any malicious task.

Kaspersky Lab says its products detect and remove all known versions of the Mask/Careto malware.

See Securelist for the full report with a detailed description of the malicious tools and stats, together with indicators of compromise. A complete FAQ is also available here.