A new modification of a computer virus Sober – Sober.R was recorded in the Internet by the anti-virus laboratory staff. According to them, the worm enters a computer, using social engineering techniques.
In particular to disseminate it uses two types of letters: the first – message in English with the subject “Your new password”. The letter is disguised as a notice of change of the password in the attached file containing the data for review – pword_change.zip. In the second case this letter is in German, supposedly with photos of old school friends in a file KlassenFoto.zip. Both compressed file includes an executable file PW_Klass.Pic.packed-bitmap.exe, which is a copy of the worm.
If about the English version of the virus experts say that it is less convincing because people have become to be suspicious of messages encouraging them to learn their new password in recent years, then German causes some concerns within the programmers. Its author uses a psychological trap forcing to open an interesting “picture”. The fact is that an unsuspecting user receives a message supposedly from his former classmate with the inscription: “I have attached a letter from our old class photo. If you find yourself there, please reply to the letter.” After opening the file, the virus gets into your computer and displays a fake error message CRC. Further, it is looking for email addresses on the infected computer files with certain extensions, and using its own SMTP-mechanism that sends itself to them. If the address ends in. De (Germany),. Ch (Switzerland),. At (Austria) or. Li (Liechtenstein), it sends a German version of the letter.
According to the director of antivirus laboratory, “Sober worm has always boasted of its ability to spread, and the new version is no exception. Perhaps the reason is that it uses social engineering techniques to persuade users to run infected files and changing language message to be sent, depending on the location of the recipient. ”
The interception of the worm was carried out with the help of preventive technologies TruPreventTM. And now, due to a sharp increase in the number of incidents caused by a new Sober.R, the companies provide users with free tools PQRemove, which detects and eliminates viruses from any infected computer.
We should to remember that different versions of the Sober create two thirds of the malware currently circulating in the Internet. The first versions of Sober have been appeared in 2003, but the latest modifications causes the greatest damage. The Sober constitutes a serious danger for family of operating systems Microsoft Windows.
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