sobota 25. února 2012

Trojan:Win32/Kexject.A


Encyclopedia entry
Updated: Sep 30, 2011  |  Published: Sep 29, 2011

Aliases
Not available

Alert Level (?)
Severe

Antimalware protection details
Microsoft recommends that you download the latest definitions to get protected.
Detection last updated:
Definition: 1.121.332.0
Released: Feb 24, 2012
Detection initially created:
Definition: 1.111.2389.0
Released: Sep 16, 2011


 

Summary

Trojan:Win32/Kexject.A is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.


 

Symptoms

System changes
The following system changes may indicate the presence of this malware:
  • The presence of the following files:
  • c:\documents and settings\administrator\application data\reader_sl.exe 

  • The presence of the following registry modifications:
  • Adds value: "Adobe Reader Speed Launcher 1.2"
    With data: "c:\documents and settings\administrator\application data\reader_sl.exe"
    To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run



 

Technical Information (Analysis)

Trojan:Win32/Kexject.A is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.
Installation
When executed, Trojan:Win32/Kexject.A copies itself to c:\documents and settings\administrator\application data\reader_sl.exe.

The malware modifies the following registry entries to ensure that its copy executes at each Windows start:
Adds value: "Adobe Reader Speed Launcher 1.2"
With data: "c:\documents and settings\administrator\application data\reader_sl.exe"
To subkey: HKCU\Software\Microsoft\windows\currentversion\run

The malware creates the following files on an affected computer:

  • c:\documents and settings\administrator\application data\hosts
Payload
Modifies Hosts file
Trojan:Win32/Kexject.A modifies the Windows Hosts file. The local Hosts file overrides the DNS resolution of a website URL to a particular IP address. Malicious software may make modifications to the Hosts file in order to redirect specified URLs to different IP addresses. Malware often modifies an affected computer's Hosts file in order to stop users from accessing websites associated with particular security-related applications (such as antivirus for example).

Contacts remote hosts
The malware may contact the following remote hosts using port 80:

  • dynupdate.no-ip.com
  • www.cifrando.com
  • www.piadasnaweb.com
  • www.procurase.net

Commonly, malware may contact a remote host for the following purposes:
  • To confirm Internet connectivity
  • To report a new infection to its author
  • To receive configuration or other data
  • To download and execute arbitrary files (including updates or additional malware)
  • To receive instruction from a remote attacker
  • To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA18a059a45cd61fe2a1465f64a2d8fc8b5542ccaf6.

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