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Removal instructions for Best Antivirus Software

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Metallica

Metallica

    Spyware Veteran

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Content is republished with permission from Malwarebytes.

What is Best Antivirus Software?

The Malwarebytes research team has determined that Best Antivirus Software is a fake anti-malware application. These so-called "rogues" use intentional false positives to convince users that their systems have been compromised. Then they try to sell you their software, claiming it will remove these threats. In extreme cases the false threats are actually the very trojans that advertise or even directly install the rogue. You are strongly advised to follow our removal instructions below.

How do I know if I am infected with Best Antivirus Software?

This is how the main screen of the rogue application looks:

Posted Image

You will find these icons on your desktop and in your taskbar:

Posted Image

And see these warnings:

Posted Image

Posted Image

Posted Image

Posted Image

How did Best Antivirus Software get on my computer?

Rogue programs use different methods for spreading themselves. This particular one was installed by a fake online scanner.

How do I remove Best Antivirus Software?

Our program Malwarebytes Anti-Malware can detect and remove this rogue application.
  • Please download Malwarebytes Anti-Malware to your desktop.
  • Double-click mbam-setup.exe and follow the prompts to install the program.
  • At the end, be sure a check-mark is placed next to the following:

    • Update Malwarebytes Anti-Malware
    • Launch Malwarebytes Anti-Malware
  • Then click Finish.
  • If an update is found, it will download and install the latest version.
  • Once the program has loaded, select Perform quick scan, then click Scan.
  • When the scan is complete, click OK, then Show Results to view the results.
  • Be sure that everything is checked, and click Remove Selected. Reboot your computer if prompted.
  • When completed, a log will open in Notepad. The rogue application should now be gone.

Is there anything else I need to do to get rid of Best Antivirus Software?

  • No, Malwarebytes Anti-Malware removes Best Antivirus Software completely.

How would the full version of Malwarebytes Anti-Malware help protect me?

We hope our application has helped you eradicate this malicious software. If your current security solution let this infection through, you might please consider purchasing the FULL version of Malwarebytes Anti-Malware for additional protection.

As you can see below the full version of Malwarebytes Anti-Malware would have protected you against the Best Antivirus Software rogue. It would have warned you before the rogue could install itself, giving you a chance to stop it before it became too late.


Posted Image

Technical details for experts

Signs in a HijackThis log:
C:\Documents and Settings\{username}\Desktop\scandsys211d_8097.exe

O4 - HKCU\..\Run: [Best Antivirus Software] "C:\Documents and Settings\All Users\Application Data\b7442\BAbff.exe" /s /d

Note: the folder- and filename are random

Alterations made by the installer:
  File System
  ===============
    Adds the folder C:\Documents and Settings\All Users\Application Data\b7442
      Adds the file BAS.ico"="18:50 13/06/12 4286 bytes
      Adds the file BAbff.exe"="10:20 07/05/12 6631424 bytes
    Adds the folder C:\Documents and Settings\All Users\Application Data\BAWNGUNS
      Adds the file BAGSS.cfg"="18:51 13/06/12 17744 bytes
    Adds the folder C:\Documents and Settings\{username}\Application Data\Best Antivirus Software
    In the existing folder C:\Documents and Settings\{username}\Application Data\Microsoft\Internet Explorer\Quick Launch
      Adds the file Best Antivirus Software.lnk"="18:50 13/06/12 1784 bytes
    In the existing folder C:\Documents and Settings\{username}\Start Menu
      Adds the file Best Antivirus Software.lnk"="18:50 13/06/12 1766 bytes
    In the existing folder C:\Documents and Settings\{username}\Start Menu\Programs
      Adds the file Best Antivirus Software.lnk"="18:50 13/06/12 1772 bytes

  Registry
  ===============
    [HKEY_CLASSES_ROOT\scandsys211d_8097.DocHostUIHandler]
      "(Default)"="'Implements DocHostUIHandler'"
    [HKEY_CLASSES_ROOT\scandsys211d_8097.DocHostUIHandler\Clsid]
      "(Default)"="'{3F2BBC05-40DF-11D2-9455-00104BC936FF}'"
    [HKEY_CLASSES_ROOT\CLSID\{3F2BBC05-40DF-11D2-9455-00104BC936FF}]
      "(Default)"="'Implements DocHostUIHandler'"
    [HKEY_CLASSES_ROOT\CLSID\{3F2BBC05-40DF-11D2-9455-00104BC936FF}\ProgID]
      "(Default)"="'scandsys211d_8097.DocHostUIHandler'"
    [HKEY_CLASSES_ROOT\CLSID\{3F2BBC05-40DF-11D2-9455-00104BC936FF}\LocalServer32]
      "(Default)"="'C:\DOCUME~1\{username}1\Desktop\SCANDS~1.EXE'"
    [HKEY_CLASSES_ROOT\Software\Microsoft\Internet Explorer\SearchScopes]
      "URL"="'http://findgala.com/?&uid=8097&q={searchTerms}'"
    [-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Reporting\RebootWatch]
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options]
      "Debugger"="'svchost.exe'"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\_avp32.exe]
      "Debugger"="'svchost.exe'"
< hundreds more opf these >
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\install.exe]
      "Debugger"="'svchost.exe'"
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe]
      "Debugger"="'svchost.exe'"
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List]
      "C:\Documents and Settings\{username}\Desktop\scandsys211d_8097.exe"= 
"'C:\Documents and Settings\{username}\Desktop\scandsys211d_8097.exe:*:Enabled:Best Antivirus Software'
    [HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Internet Explorer\SearchScopes]
      "URL"="'http://findgala.com/?&uid=8097&q={searchTerms}'"
    [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer]
      "IIL"="0"
      "ltHI"="0"
      "ltTST"="60644"
      "PRS"="'http://127.0.0.1:27777/?inj=%ORIGINAL%'"
    [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\BrowserEmulation]
      "MSCompatibilityMode"="0"
    [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download]
      "RunInvalidSignatures"="1"
      "CheckExeSignatures"="'no'"
    [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes\{0633EE93-D776-472f-A0FF-E1416B8B2E3A}]
      "URL"="'http://findgala.com/?&uid=8097&q={searchTerms}'"
    [-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce]
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
      "DisallowRun"="1"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun]
      "15"="'avgwdsvc.exe'"
      "14"="'avgcmgr.exe'"
      "13"="'avgchsvx.exe'"
      "12"="'avgemc.exe'"
      "11"="'avgcfgex.exe'"
      "10"="'avgscanx.exe'"
      "9"="'avgtray.exe'"
      "8"="'avgui.exe'"
      "7"="'avgfrw.exe'"
      "6"="'avscan.exe'"
      "5"="'avcenter.exe'"
      "4"="'avgnt.exe'"
      "3"="'egui.exe'"
      "2"="'ekrn.exe'"
      "1"="'MSASCui.exe'"
      "0"="'msseces.exe'"
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
      "Best Antivirus Software"="'"C:\Documents and Settings\All Users\Application Data\b7442\BAbff.exe" /s /d'"



Malwarebytes Anti-Malware log:
Malwarebytes Anti-Malware 1.61.0.1400
www.malwarebytes.org

Database version: v2012.06.13.05

Windows XP Service Pack 3 x86 NTFS
Internet Explorer 8.0.6001.18702
{username} :: MBAM-D3E8C91ACC [limited]

6/13/2012 7:01:27 PM
mbam-log-2012-06-13 (19-01-27).txt

Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 175812
Time elapsed: 47 second(s)

Memory Processes Detected: 1
C:\Documents and Settings\{username}\Desktop\scandsys211d_8097.exe (Rogue.PersonalSecuritySentinel) -> 1016 -> Delete on reboot.

Memory Modules Detected: 0
(No malicious items detected)

Registry Keys Detected: 760
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\a.exe (Security.Hijack) -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\aAvgApi.exe (Security.Hijack) -> Quarantined and deleted successfully.
< hunderds more of these >
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\~2.exe (Security.Hijack) -> Quarantined and deleted successfully.

Registry Values Detected: 32
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run|Best Antivirus Software (Rogue.PersonalSecuritySentinel) 
-> Data: "C:\Documents and Settings\All Users\Application Data\b7442\BAbff.exe" /s /d -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|0 (Security.Hijack) -> Data: msseces.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|1 (Security.Hijack) -> Data: MSASCui.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|2 (Security.Hijack) -> Data: ekrn.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|3 (Security.Hijack) -> Data: egui.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|4 (Security.Hijack) -> Data: avgnt.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|5 (Security.Hijack) -> Data: avcenter.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|6 (Security.Hijack) -> Data: avscan.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|7 (Security.Hijack) -> Data: avgfrw.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|8 (Security.Hijack) -> Data: avgui.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|9 (Security.Hijack) -> Data: avgtray.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|10 (Security.Hijack) -> Data: avgscanx.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|11 (Security.Hijack) -> Data: avgcfgex.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|12 (Security.Hijack) -> Data: avgemc.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|13 (Security.Hijack) -> Data: avgchsvx.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|14 (Security.Hijack) -> Data: avgcmgr.exe -> Quarantined and deleted successfully.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun|15 (Security.Hijack) -> Data: avgwdsvc.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Arrakis3.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdAgent.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdreinit.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdsubwiz.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdtkexec.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdwizreg.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\egui.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ekrn.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\install.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\livesrv.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\seccenter.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\uiscan.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\upgrepl.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\vsserv.exe|Debugger (Security.Hijack) -> Data: svchost.exe -> Quarantined and deleted successfully.

Registry Data Items Detected: 1
HKCR\SOFTWARE\Microsoft\Internet Explorer\SearchScopes|URL (Hijack.SearchPage) -> Bad: (http://findgala.com/?&uid=8097&q={searchTerms}) 
Good: (http://www.google.com/search?q={searchTerms}&rls=com.microsoft:{language}&ie={inputEncoding}&oe={outputEncoding}&startIndex={startIndex?}&startPage={startPage}) 
-> Quarantined and repaired successfully.

Folders Detected: 0
(No malicious items detected)

Files Detected: 6
C:\Documents and Settings\{username}\Desktop\scandsys211d_8097.exe (Rogue.PersonalSecuritySentinel) -> Delete on reboot.
C:\Documents and Settings\All Users\Application Data\b7442\BAbff.exe (Rogue.PersonalSecuritySentinel) -> Quarantined and deleted successfully.
C:\Documents and Settings\{username}\Application Data\Microsoft\Internet Explorer\Quick Launch\Best Antivirus Software.lnk (Rogue.BestAntivirusSoftware) -> Quarantined and deleted successfully.
C:\Documents and Settings\{username}\Desktop\Best Antivirus Software.lnk (Rogue.BestAntivirusSoftware) -> Quarantined and deleted successfully.
C:\Documents and Settings\{username}\Start Menu\Programs\Best Antivirus Software.lnk (Rogue.BestAntivirusSoftware) -> Quarantined and deleted successfully.
C:\Documents and Settings\{username}\Start Menu\Best Antivirus Software.lnk (Rogue.BestAntivirusSoftware) -> Quarantined and deleted successfully.

(end)


As mentioned before the full version of Malwarebytes Anti-Malware could have protected your computer against this threat.
We use different ways of protecting your computer(s):
  • Dynamically Blocks Malware Sites & Servers
  • Malware Execution Prevention
Save yourself the hassle and get protected.
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