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Virus Profile: Downloader-BWN!0017073F3108

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 5/25/2012
Date Added: 5/25/2012
Origin: Unknown
Length: 396288
Type: Trojan
Subtype: Downloader
DAT Required: 6722
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-BWN
Length396288 bytes
MD50017073f3108e4096fd255986cc81a56
SHA10c95fac90efba3059968e7ab196383a4a4e266cf


Other Common Detection Aliases

Company NamesDetection Names
EMSI SoftwareTrojan-Spy.Win32.Zbot!IK
ahnlabWin32/IRCBot.worm.variant
avastWin32:Spyware-gen
AVG (GriSoft)Downloader.Generic9.YRP
aviraTR/Zbot.dou.1
KasperskyTrojan-Spy.Win32.Zbot.aiwn
BitDefenderTrojan.Generic.2981999
clamavPUA.Packed.ASPack
Dr.WebTrojan.PWS.Panda.122
eSafe (Alladin)Win32.TrojanMeredrop
Microsofttrojan:win32/meredrop
SymantecTrojan Horse
Eseta variant of Win32/Kryptik.BBQ
normanW32/Suspicious_Gen2.PBJEK
SophosMal/EncPk-OC
Trend MicroTROJ_KRYPTK.SMM1
V-BusterTrojan.Meredrop!H0DYbzY3PVk

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
Attempts to write to a memory location where winlogon residesHigh
Attempts to load and execute remote code in a previously loaded processMedium
Attempts to write to a memory location of a previously loaded process.Medium
Adds or modifies winlogon userinit registry value. Could be used to launch a program on startup.Medium
Modifies winlogon configuration settings in registryMedium
Enumerates process listLow
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaDownloader-BWN
McAfee SupportedDownloader-BWN



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:

0c95fac90efba3059968e7ab196383a4a4e266cf

The following files have been added to the system:

  • %WINDIR%\SYSTEM32\lowsec\user.ds
  • %WINDIR%\SYSTEM32\lowsec\local.ds
  • %WINDIR%\SYSTEM32\sdra64.exe
The following files have been changed:

  • %WINDIR%\debug\usermode\userenv.log
The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\USERINIT = %WINDIR%\SYSTEM32\userinit.exe,%WINDIR%\SYSTEM32\sdra64.exe,
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\MACHINE\EXTENSION-LIST\{00000000-0000-0000-0000-000\ENDTIMEHI = 30083332
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\MACHINE\EXTENSION-LIST\{00000000-0000-0000-0000-000\ENDTIMELO = 2653258478
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\MACHINE\EXTENSION-LIST\{00000000-0000-0000-0000-000\LOGGINGSTATUS = 0
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\MACHINE\EXTENSION-LIST\{00000000-0000-0000-0000-000\STARTTIMEHI = 30083332
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\MACHINE\EXTENSION-LIST\{00000000-0000-0000-0000-000\STARTTIMELO = 2651695978
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\MACHINE\EXTENSION-LIST\{00000000-0000-0000-0000-000\STATUS = 0
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\S-1-5-21-1482476501-[private subnet]522115-500\EXTENS\ENDTIMEHI = 30083332
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\S-1-5-21-1482476501-[private subnet]522115-500\EXTENS\ENDTIMELO = 2671695978
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\S-1-5-21-1482476501-[private subnet]522115-500\EXTENS\LOGGINGSTATUS = 0
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\S-1-5-21-1482476501-[private subnet]522115-500\EXTENS\STARTTIMEHI = 30083332
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\S-1-5-21-1482476501-[private subnet]522115-500\EXTENS\STARTTIMELO = 2651539728
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\GROUP POLICY\STATE\S-1-5-21-1482476501-[private subnet]522115-500\EXTENS\STATUS = 0
   

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.