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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

Trojan-Downloader.BAT.wGet.m

Detected Jul 03 2011 06:16 GMT
Released Jul 03 2011 08:50 GMT
Published Sep 26 2011 08:20 GMT

Technical Details
Payload
Removal instructions

Technical Details

A trojan program that downloads files from the Internet without the user's knowledge. This is a batch file command interpreter (BAT-file). 8326 bytes.


Payload

Using the "wget" utility, the trojan downloads a file from the internet from the following link:

http://tinyurl.com/6***9bc
The link did not work when creating the description.

The downloaded file is copied by the trojan under the following names:

c:\WINDOWS\system32\drivers\etc\hosts
d:\WINDOWS\system32\drivers\etc\hosts
e:\WINDOWS\system32\drivers\etc\hosts
f:\WINDOWS\system32\drivers\etc\hosts
g:\WINDOWS\system32\drivers\etc\hosts
The trojan therefore replaces the "hosts" system file if the operating system is installed on one of the indicated drives.


Removal instructions

If your computer has not been protected with anti-virus software and has been infected with malware, you will need to take the following actions to delete this:

  1. Delete the original program file (its location on the infected computer will depend on how the program got onto the computer).
  2. Change the modified "%System%\drivers\etc\hosts" file using any standard application (for example, "Blocknote" — "Notepad"). You need to delete all of the strings added by the trojan. The original hosts files looks as follows:
    # (C) Microsoft Corp., 1993-1999
    #
    # It is a sample HOSTS file using Microsoft TCP/IP for Windows.
    #
    # This file contains the mappings for the IP-address to the host names.
    # Each element should be located within a separate string. The IP-address should
    # be located in the first column, followed by the relevant name.
    # The IP-address and host name should be separated by at least one space.
    #
    # Moreover, some strings may contain comments 
    # (details of the string). These should follow the name of the host and should be separated
    # from it by the '#' symbol.
    #
    # For example:
    #
    # 102.54.94.97 rhino.acme.com # source server
    # 38.25.63.10 x.acme.com # client host x
    
    127.0.0.1 localhost
    
  3. Run a full Kaspersky Antivirus scan of the computer with updated antivirus databases (download trial version).


MD5: af66f43f9ef8d8e3257e67592e71e7a3
SHA1: 3f43c4d6b0548d331e83545da22647b2122c6ee3


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Trojan-Downloader

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.