Virus:W32/Wigar.A
Date discovered:18/09/2007
Type:File infector
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:No
File size:26.624 Bytes
IVDF version:6.39.01.145 - Tuesday, September 18, 2007

 General Method of propagation:
   • Infects files


Aliases:
   •  Symantec: Trojan Horse
   •  Kaspersky: Virus.Win32.Agent.h
   •  Eset: Win32/Agent.NJP trojan


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Infects files
   • Registry modification

 Files It copies itself to the following location:
   • %SYSDIR%\EXPLORER.EXE



It may corrupt the following files:
   • %SYSDIR%\ias\dnary.mdb
   • %SYSDIR%\ias\ias.mdb



The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
   • %six-digit random character string%.cdx

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "EXPLORER"="%SYSDIR%\EXPLORER.EXE"

 File infection Infector type:

Prepender - The virus code is added at the begining of the infected file.


Method:

This memory-resistent infector remains active in memory.


Infection length:

- 26.624 Bytes


The following files are infected:

By file type:
   • *.exe

Files in any of the following directories:
   • %all directories%

 File details Programming language:
 The malware program was written in Delphi.

Description inserted by Daniel Constantin on Wednesday, February 10, 2010
Description updated by Daniel Constantin on Wednesday, February 10, 2010

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