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Danger level 7
Type: Trojans
Common infection symptoms:
  • Installs itself without permissions
  • Connects to the internet without permission
  • Slow internet connection
  • System crashes
  • Slow Computer


The vicious Win32/Sirefef.DK, or Trojan:Win32/Sirefef.P, is not an easily detectable infection which you could delete using out-of-date security applications. This is because the sinister cyber criminals’ creation is composed of multiple malignant components and has been created to assist other Sirefef family infections and help with their latent propagation into your own Windows systems or other computers. Since all infections from this family are closely linked and compliment one another, it is believed that the vicious Trojan is likely to enter your PC with the help of other malignant programs, like Win32/Cycbot or Win32/Vobfus. Nonetheless, it does not mean that you should not be careful with encrypted software, spam email attachments and other security backdoors that could let in the malicious application into your computer. If it is already too late, or you suspect that some kind of infection is corrupting your personal computer, this report will show you how to delete Win32/Sirefef.DK, and what signs could warn you about its existence within the PC.

File.exe is one of the dangerous Trojan’s executables, which can add products to the startup applications, modify runtime policies, breach the security of Windows Registry, terminate or execute processes, reconfigure Firewall settings to allow undisturbed connection to the Internet and download malware. This component can also copy file data from autoexec.bat, which may be employed to record keystrokes, mouse clicks or screen content, something that later on could allow schemers to breach personal accounts. This file is not the only malicious component, and you should also beware of the deceitful install_flash_player.exe (or flash_player_firefox.exe) – a high-risk component that uses the name of a legitimate Adobe Flash Player Installer application. Regardless of the name, the executable may hijack system’s processes, delete or add Start Menu links and perform various illicit online operations. Setup.exe is one more file you have to inspect, as its could disable safe mode, restrict Windows Security Center functionality, and even remove access to Windows Registry Editor or Task Manager utilities which could help you delete Win32/Sirefef.DK and its malignant components.

Since the Trojan can be hidden from your detection and removal it will not be easy for you to manage this devious program, which schemers will employ to disrupt your Windows running, connect to personal accounts and spread malicious applications across the web. If you think you can manage Win32/Sirefef.DK removal without access to the essential Windows utilities, please see the list of files that need to be deleted from the PC. And if you doubt your knowledge – install automatic removal tools which could also prevent other malicious infections from entering your computer again.

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How to manually remove Win32/Sirefef.DK

Files associated with Win32/Sirefef.DK infection:


Win32/Sirefef.DK processes to kill:


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