The Internet threat alert status is currently normal. At present, no major epidemics or other serious incidents have been recorded by Kaspersky Lab’s monitoring service. Internet threat level: 1


Detected Dec 22 2010 02:22 GMT
Released Dec 22 2010 08:43 GMT
Published Apr 21 2011 09:54 GMT

There is currently no description for this program

If you’d like to find out more about how programs of this type function, please read about the general behavior of programs in the same class or sub-class (see right).

Because many programs of this type are slight modifications of older versions, the descriptions for these older versions may be of interest. Links to any available descriptions are displayed under the general description on the right of the screen.

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Programs classified as Trojan-Downloader download and install new versions of malicious programs, including Trojans and AdWare, on victim computers. Once downloaded from the Internet, the programs are launched or included on a list of programs which will run automatically when the operating system boots up.

Information about the names and locations of the programs which are downloaded are in the Trojan code, or are downloaded by the Trojan from an Internet resource (usually a web page).

This type of malicious program is frequently used in the initial infection of visitors to websites which contain exploits.


Trojan-Downloader.JS.Twetti.g (Kaspersky Lab) is also known as:

  • Mal/ObfJS-AG (Sophos)
  • JS/Twetty.A (Panda)
  • JS/TrojanDownloader.Twetti.NAC trojan (Nod32)
  • Trojan.JS.Downloader.BJF (BitDef7)
  • JS:Twetti-A [Trj] (AVAST)
  • Trojan-Downloader.JS.Twetti (Ikarus)
  • NseCheckFile2() returned 0x00010018 (Norman)