Threat Descriptons



Category :


Type :


Aliases :

Trojan-Spy.Win32.Lydra.dt, Spy-Wokiscan Trojan


Trojan-Spy:W32/Lydra.DT is a Trojan-Spy that monitors user activity on the infected machine.


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Trojan-Spy:W32/Lydra.DT is a Trojan-Spy that monitors user activities in the infected machine.

It stays active in Windows memory and starts keylogging (recording keyboard and mouse inputs). It stores the recorded keystrokes data and computer hardware and software information for later submission and sends it to the malware author via email.

It creates these files upon execution:

  • %windir%\mui\rctfd.sys
  • %windir%\syswin.exe
  • %windir%\lsassv.exe
  • %windir%\msrpc.exe
  • %windir%\calc.exe
  • %windir%\regedit2.exe
  • %allusersprofile%\Start Menu\Programs\Startup\AdobeGammaLoader.scr

It also modifies some Windows files found in the %windir% folder.

Adds itself as a system service and puts multiple registry run entries to execute itself when the system starts.

Changes to the registry follows:

  • HKLM\SOFTWARE\Classes\CLSID\{65D5AFFB-D4EF-49AA-GFFG-5DA5E12E300A} ThisEXE = %cwd%\wokiscan.exe
  • HKLM\SOFTWARE\Classes\CLSID\{65D5AFFB-D4EF-49AA-GFFG-5DA5E12E300A} VerProg = 0000009B
  • HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run syswin = c:\windows\syswin.exe
  • HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run syswin = c:\windows\syswin.exe
  • HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices syswin = c:\windows\syswin.exe
  • HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run lsassv = c:\windows\lsassv.exe
  • HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run msrpc = c:\windows\msrpc.exe
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin DependOnGroup =
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin DependOnService = RpcSs
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin Description = This service manages TCP/IP packets at Internet
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin DisplayName = TCPIP route manager
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin Group = PlugPlay
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin ObjectName = LocalSystem
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin ImagePath = c:\windows\syswin.exe
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin ErrorControl = 00000001
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin PlugPlayServiceType = 00000003
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin Start = 00000002
  • HKLM\SYSTEM\CurrentControlSet\Services\syswin Type = 00000120
  • HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List %cwd%\wokiscan.exe = %cwd%\wokiscan.exe:*:Enabled:System Update

Trojan-Spy:W32/Lydra.DT also collects email addresses found in files with pre-defined name extensions from the infected machine's available drives. It is also able to terminate security related processes and services.

It uses either its built-in SMTP engine or MAPI to send the encrypted stolen information via email:

  • smtp server :
  • email address : and
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