Trojan Winlogon

Modes of infection of Winlogon Trojan

Winlogon.exe is a process that runs in the background. Winlogon is a critical part of the Windows login subsystem, which in addition requires for a user authorization and Windows activation checks. There are Trojan viruses that come as winlogon.exe and install itself in the directory C:\Windows\System32.

Winlogon Trojan, it smode of infection, consequences of this infection and how it can harm a computer is discussed in the following points.

• Modes of infection in the PC
• Consequence of infection
• Harmful effects

Modes of infection in the PC

There are different ways through which this Trojan can infect the computer. The first and the most common way in which the virus infection is through opening e-mail attachments that are infected by the virus. In addition web browser exploits [i.e. pieces of codes that takes advantage of bugs – software errors, making the web browser to execute in an expected way that may include crashing].

The Trojan attaches itself to the system using a fake browser helper object and DLL files that are then attached to the system files as winlogon.exe or explorer.exe or isass.exe. In addition the Trojans inserts itself in the registry.

Consequence of infection

Once the registry has been infected, the Trojan suppresses all Windows possible warnings about firewalls, antivirus and automatic update service. If the user tries to manually enable these services, the virus disables them again. Any removal tool for malware that may be installed are attacked and rendered in effective in the process.

Once the anti-virus and its related updates are disabled, the computer will be unable to access updates thus leaving the computer vulnerable to additional viruses. The registry being an integral component for all programs installed in the computer having been affected leads to several runtime errors during execution. In the long run, if the user is not fully aware of what is happening the system will eventually crush leading to loss of valuable data and files.

Apart from system crush the computer starts behaving in a peculiar manner causing disruption of the user. I.e. when the browser is opened, it re-directs to a different website other than the one specified. Pop-ups become major issues as the user is unable to close them even by blocking on the toolbar.

The access to the network will also be blocked eventually. The idea is to prevent access to anti-virus updates and removal tools.

Harmful effects

Inability to access the internet is the most likely outcome; undesirable outcomes are likely to occur as the PC will be performing its own actions other than the ones stated by the user. Loss of data and files leading to loss of revenue in time of time to recover lost data and the amount spent to restore the computer.

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