Autorun Worm Invades Zip

[Peaches]

Autorun Worm Invades ZIP

6:15 pm (UTC-7) | by Alice Decker (Advanced Threats Researcher)

Stealth technique used by malware is considered a core characteristic which has been developed, improved, redesigned, and reused. Michael Tants, Threat Researcher at Regional TrendLabs in Europe, has notified us of a worm that has a unique way of hiding: on infection, WORM_AUTORUN.JFZ writes a copy of itself in every ZIP-compressed file it finds on a system.

When WORM_AUTORUN.JFZ places a copy of itself in an archive, it uses double extension by adding .GIF and .SCR.

The .GIF extension is used as its social engineering factor. Curious users who still have their default configurations set in Windows Explorer (where the extension of known file types is hidden) may have an unpleasant experience once they double-click on the purported image file. The .SCR extension, on the other hand, makes it an executable file.

TrendLabs for more detail & screenshot - http://blog.trendmicro.com/