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TrojanDownloader:Win32/Stegvob


TrojanDownloader:Win32/Stegvob is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.


What to do now

To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: For more information about using antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Threat behavior

TrojanDownloader:Win32/Stegvob is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.
Payload
Modifies system security settings
TrojanDownloader:Win32/Stegvob adds itself to the list of applications that are authorized to access the Internet without being stopped by the Firewall, by making the following registry modification:

Adds value: "<malware file>.exe"
With data: "<malware file>.exe:*:enabled:ldrsoft"
To subkey: HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
 
Contacts remote host
The malware may contact a remote host at 211.154.153.49 using port 80. Commonly, malware may contact a remote host for the following purposes:
  • 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

Stegvob has been observed downloading malware from the following malware families onto affected computers:

Symptoms

System changes
The following system changes may indicate the presence of this malware:

 
  • The presence of the following registry modifications:
Adds value: "<malware file>.exe"
With data: "<malware file>.exe:*:enabled:ldrsoft"
To subkey: HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
 

Prevention


Alert level: Severe
First detected by definition: 1.109.116.0
Latest detected by definition: 1.143.79.0 and higher
First detected on: Jul 22, 2011
This entry was first published on: Jul 22, 2011
This entry was updated on: Aug 01, 2011

This threat is also detected as:
No known aliases