Virus Profile: Downloader.gen.a!1E404DC691DA

Threat Search
Print
   
Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 12/5/2012
Date Added: 12/5/2012
Origin: Unknown
Length: 67676
Type: Trojan
Subtype: Generic
DAT Required: 6916
Removal Instructions
   
 
 
   

Description

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.

Indication of Infection

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

Methods 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.

   

Virus Characteristics

This is a Trojan

File PropertiesProperty Values
McAfee DetectionDownloader.gen.a
Length67676 bytes
MD51e404dc691dad7acfa785d529939e243
SHA1356c475ea9d704af551f18496984b556647539e4


Other Common Detection Aliases

Company NamesDetection Names
EMSI SoftwareTrojan-Downloader.Win32.IstBar!IK
ahnlabWin-AppCare/Xema.67676
aviraTR/Dldr.IstBar.IT
KasperskyTrojan-Downloader.Win32.IstBar.lu
BitDefenderTrojan.Downloader.Istbar.LU
clamavTrojan.Downloader.Istbar-170
Dr.WebTrojan.Isbar.356
eSafe (Alladin)Win32.Istbar
F-ProtW32/Downloader!3ba9
FortiNetW32/IstBar.LU!tr.dldr
Microsofttrojandownloader:win32/istbar.m
SymantecAdware.Istbar
EsetWin32/Adware.ISTbar (application)
normanSuspicious_Gen2.OVKGY
pandaAdware/IST.ISTBar
risingTrojan.DL.IstBar.zy
SophosMal/Generic-L
vba32Trojan-Downloader.Win32.IstBar.lu
V-BusterTrojan.DL.Istbar.Gen.1
Vet (Computer Associates)Win32/Istbar.AE

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


ActivitiesRisk Levels
Enumerates many system files and directories.Low
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaDownloader.gen.a
McAfee SupportedDownloader.gen.a



System Changes

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


The following files were analyzed:

356c475ea9d704af551f18496984b556647539e4

The following files have been added to the system:

  • C:\data

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

  • %TEMP%\nss2.tmp\InstallOptions.dll
  • %TEMP%\nss2.tmp
  • %TEMP%\nss2.tmp\ysb.ini
  • %TEMP%\nss2.tmp\NSISdl.dll
  • %TEMP%\nss2.tmp\logo.bmp
  • %TEMP%\nsd5.tmp
  • %TEMP%\nss2.tmp\System.dll
  • %TEMP%\nsa14.tmp
  • %TEMP%\nsc1.tmp

The following registry elements have been created:

  • HKEY_CURRENT_USER\SOFTWARE\IST\

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\IST\EXE_START = 1
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\CONTROL\SESSION MANAGER\PENDINGFILERENAMEOPERATIONS = \??\%TEMP%\nss2.tmp\

   

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.

   

PC Infected? Get Expert Help

McAfee
Virus Removal Service

Connect to one of our Security Experts by phone. Have your PC fixed remotely - while you watch!

$89.95