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Virus Profile: Downloader.a!csl!AE18C52AB54F

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 11/18/2012
Date Added: 11/18/2012
Origin: Unknown
Length: 151652
Type: Trojan
Subtype: -
DAT Required: 6899
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.a!csl
Length151652 bytes
MD5ae18c52ab54fd92b106733f0e57881a3
SHA1a8259b58081ab172c041bade643bdd1d0cca14da


Other Common Detection Aliases

Company NamesDetection Names
ahnlabTrojan/Win32.PbBot
AVG (GriSoft)BackDoor.Generic13.DBC
KasperskyBackdoor.Win32.Inject.geu
FortiNetW32/Zegost.A!tr
MicrosoftBackdoor:Win32/Agent.AXB
normanW32/ServStart.G
pandaTrj/Downloader.MDW
risingTrojan.DL.Win32.GenFxj.aq
Trend MicroBKDR_ZEGOST.SMM
vba32Worm.Palevo.dklk

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


ActivitiesRisk Levels
Attempts to write to a memory location of a Windows system processHigh
Enumerates many system files and directories.Low
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaDownloader.a!csl
McAfee SupportedDownloader.a!csl



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:

a8259b58081ab172c041bade643bdd1d0cca14da

The following files have been added to the system:

  • %WINDIR%\SYSTEM32\applelogs.key
  • %WINDIR%\SYSTEM32\boehukfh.td
  • %WINDIR%\SYSTEM32\ofirlb.td
  • %WINDIR%\SYSTEM32\systeminf.inf

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

  • C:\applezscc.aqq
  • C:\apple.bat
  • C:\Documents and Settings\apple.bat

The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\CONTROL\SESSION MANAGER\PENDINGFILERENAMEOPERATIONS = \??\C:\Documents AND Settings\apple.bat
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\TYPE = 288

The applications attempted the following network connection(s):

  • 125.77.199.**:301

   

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.