This page shows details and results of our analysis on the malware Generic.tfr!24E1CEC589E2


This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Minimum Engine


File Length


Description Added


Description Modified


Malware Proliferation


This is a Trojan

File PropertiesProperty Values
McAfee DetectionGeneric.tfr
Length4923712 bytes

Other Common Detection Aliases

Company NamesDetection Names
avastWin32:Rootkit-gen [Rtk]
vba32suspected of Trojan.Downloader.gen.h

Other brands and names may be claimed as the property of others.

ActivitiesRisk Levels
Attempts to connect to a medium risk domain that may pose a minor security risk.Medium
Enumerates many system files and directories.Low
Adds or modifies Internet Explorer cookiesLow

McAfee ScansScan Detections
McAfee BetaGeneric.tfr
McAfee SupportedGeneric.tfr

System Changes

Some path values have been replaced with environment variables as the exact location may vary with different configurations.
%WINDIR% = \WINDOWS (Windows 9x/ME/XP/Vista/7), \WINNT (Windows NT/2000)
%PROGRAMFILES% = \Program Files

The following files were analyzed:


The following files have been added to the system:

  • %TEMP%\nsaA.tmp\nsd20.tmp
  • %TEMP%\nsv9.tmp
  • %TEMP%\nsaA.tmp\EmbedWeb.dll
  • %TEMP%\nsaA.tmp\Banner.dll
  • %TEMP%\nsaA.tmp\button.png
  • %TEMP%\nsaA.tmp\browse.png
  • %TEMP%\nsaA.tmp\Button.dll
  • %TEMP%\nsaA.tmp\nsx11.tmp
  • %TEMP%\nsaA.tmp\bg.bmp
  • %TEMP%\nsaA.tmp\KPTool.dll
  • %TEMP%\nsaA.tmp\sndsock.dll
  • %TEMP%\nsaA.tmp\ToolTips.dll
  • %TEMP%\nsaA.tmp\check.png
  • %TEMP%\nsaA.tmp\ShellLink.dll
  • %TEMP%\nsaA.tmp\close.png
  • %TEMP%\nsaA.tmp\nsDialogs.dll
  • %TEMP%\nsaA.tmp\inetc.dll
  • %TEMP%\nsaA.tmp\System.dll

The following files have been changed:

  • %TEMP%orary Internet Files\Content.IE5\index.dat

The following files were temporarily written to disk then later removed:

  • %TEMP%\nsaA.tmp
  • %TEMP%\nsp8.tmp

The applications attempted the following network connection(s):

  • 42.120.219.***:80
  • 66.102.255.**:80
  • hxxp://*****
  • 61.135.185.***:80
  • 117.27.241.***:80
  • 121.40.152.***:6000
  • 183.60.107.**:82
  • 42.156.140.***:80
  • 119.147.144.**:82
  • 113.107.42.**:80
  • 115.29.98.***:80
  • 42.156.140.**:80


This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.


Please use the following instructions for all supported versions of Windows:

1. Disable Windows System Restore. For instructions, please refer to:

2. Update your McAfee Anti-Virus product to the latest version (when possible), and ensure the latest DAT and Engine and any applicable EXTRA.DATs are installed.

3. Run a full system scan. (On-Demand Scan)

4. Reboot, as soon as it is convenient, to ensure all malicious components are removed.