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The developers of a family of Trojans Sirefef / Zaccess spread malicious code, by embedding it in legitimate software.

According to the experts from Trend Micro, the company recorded an “explosion” of infections Trojan Sirefef. According to experts, the developers of a family of Trojans Sirefef / Zaccess, used to download additional malware and blocking anti-virus products have changed the method of infection.

So, instead of the standard distribution of malicious spam to the addresses of corporate e-mail, virus writers have become embedded malicious code into legitimate application. In Trend Micro found infected installer games, codecs and applications for the selection of license keys.

“Over the last week of July, we received many messages from our clients that their files have been modified services.exe unknown malware” – should be notified of the experts.

As it turned out, it was a component of a family of malware Sirefef / Zaccess, which are used by hackers to download malicious third-party applications and install them after a reboot.

At the same time the most popular among hackers used the installer of codecs K-Lite Codec Pack.exe. To maintain the illusion of legitimacy of the program file name is sometimes substituted for the name of popular films.