The Emsisoft malware research team has discovered a new outbreak of the Windows Diagnostic adware. Emsisoft Anti-Malware detects this malware as Adware.Win32.WindowsDiagnostic.

Windows Diagnostic is a rogue application. A rogue application tries to trick you by displaying false positive/misleading scan results report, which says that your computer has a problem, or infected with viruses or trojan, but you will not be able to fix it before you purchase.

Variants of the rogue defragmenter:

• Win Scan
• Win Disk
• Disk Recovery
• Windows Disk
• Windows Scan
• Memory Optimizer
• Disk Optimizer
• Easy Scan
• Good Memory
• Fast Disk
• Disk OK
• My Disk
• Memory Fixer
• HDD Fix
• Scanner
• HDD Low
• Disk Repair
• Defragmenter
• HDD Tools
• Smart HDD
• HDD Rescue
• HDD Plus
• HDD Diagnostic
• Hard Drive Diagnostic
• Disk Doctor
• Win Defragmenter
• WinDefrag
• WinHDD
• CheckDisk
• Ultra Defragger
• Quick Defragmenter
• Smart Defragmenter
• HDD Defragmenter
• System Defragmenter

Create new files:

• %AllUsersProfile%\Application Data\%random%
• %AllUsersProfile%\Application Data\%random%.exe
• %AllUsersProfile%\Application Data\EAGueaRwrDlOoPP.exe
• %AllUsersProfile%\Application Data\~%random%
• %AllUsersProfile%\Application Data\~%random%r
• %UserProfile%\Desktop\Windows Diagnostic.lnk
• %UserProfile%\Local Settings\Temp\tmp3.tmp
• %UserProfile%\Start Menu\Programs\Windows Diagnostic\
• %UserProfile%\Start Menu\Programs\Windows Diagnostic\Uninstall Windows Diagnostic.lnk
• %UserProfile%\Start Menu\Programs\Windows Diagnostic\Windows Diagnostic.lnk

Create/modify registry entries:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system\
  DisableTaskMgr: 0×00000001

• HKEY_CURRENT_USER\Software\
  75fa38b7-8b94-4995-ad32-52e938867954:
  BD: 43 00 3A 00 5C 00 44 00 6F 00 63 00 75 00 6D 00 65 00 6E 00 74 00 73 00 20 00 61 00…

• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\
  Use FormSuggest: “Yes”

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
  WarnonBadCertRecving: 0×00000000
  CertificateRevocation: 0×00000000

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop\
  NoChangingWallPaper: 0×00000001

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations\
  LowRiskFileTypes: “/{hq:/s`s:/ogn:/uyu:/dyd:/c`u:/bnl:/ble:/sdf:/lrh:/iul:/iulm:/fhg:/clq:/kqf:/`wh:/lqf:/lqdf:/lnw:/lq2:/l2t:/v`w:/rbs:”

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments\
  SaveZoneInformation: 0×00000001

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\
  DisableTaskMgr: 0×00000001

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\
  EAGueaRwrDlOoPP: “%AllUsersProfile%\Application Data\EAGueaRwrDlOoPP.exe”

• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download\
  CheckExeSignatures: “no”

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
  Hidden: 0×00000000

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
  ShowSuperHidden: 0×00000000

Screenshots:

How to remove the infection of Windows Diagnostic (Adware.Win32.WindowsDiagnostic)?

To delete this malware infection, please download and install Emsisoft Anti-Malware. Run a full scan on all drives and move all detected items to the quarantine.

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