Thursday, January 21, 2010
Friday, December 04, 2009
Disable Click Sound in Internet Explorer (IE) for Windows XP/Server 2003/Vista
If you want to disable the click sound in Internet Explorer found in Microsoft Windows XP, Windows Server 2003 or Windows Vista, then follow these steps:
- Open the Start Menu / Settings / Control Panel
- Double click on the "Sounds" control panel. In this control panel, Scroll down in the events window until you reach "Windows Explorer" and under this you will find "Start Navigation".
- Click on "Start Navigation" and you will see a .wav file appear in the "Name:" box. This is the sound that is associated with the click sound.
- In the "Name:" drop down menu, select (None) and then hit "OK". This will set no sound to be played when you're navigating on the web.
Keep in mind that this will remove the click sound from hitting buttons and links on all web sites you visit until you set it back. This is a safe change to make and does not affect any other functionality of your Windows Explorer browser.
Friday, June 26, 2009
Difference between system standby and hibernation
What is the difference between system standby and hibernation?
In standby/sleep, the power is kept on to the memory, the processor is bought to a stop and devices are put into low power mode. However there is still some activity as the memory still needs to be refreshed (otherwise it looses its contents) and the low power mode of devices may not be all that low. Unplugging the computer from the mains (or removing/flattening the battery) will result cause a cold reboot with possible data loss. Startup from standby is very quick as the devices need to be woken and the CPU restarted.
In hibernate, the memory is written to the hard disk (in the hiberfil.sys file), along with the state of devices and the CPU and then the power is turned 'off'. The computer is still burning a little power as things like keyboard/mouse/LAN power on features are supported. However, unlike standby, unplugging the computer from the mains doesn't result in a col boot or data loss as everything needed is stored on the hard disk. Startup is still pretty quick as the memory needs to be read from the disk, the devices reactivated and the CPU restored to the same state is was when the hibernate started.
Vista goes one step further with its 'hybrid sleep' mode which writes all the same stuff to the disk as a hibernate does, but then keeps the system in standby mode. If the power hasn't been interrupted then the restart is the same as a standby restart, or if the power has been interrupted then a warm boot from the hibernate info on the hard disk is used.
However, almost all computers are never completely turned off unless the power/battery is removed. PC power supplies have a special power lead to provide 'standby' power that is always there even if the computer is 'off'. It doesn't matter if the computer is in standby, hibernate or a full shutdown, that standby power is still there. This means the power supply is still alive and chewing power.
Most ATX power supplies have a kind of efficient 'baby' power supply built in to supply this standby power when the main power supply is off. However I had one very inefficient power supply that drew nearly 60 watts even when the computer was fully shutdown! I'd say it didn't have this baby component and used the main power supply circuit all the time. I've since 'retired' that power supply!
So to answer the original questions "is this what some people mean when they say they never really turn their computers off?"
Basically yes.
Does hibernation consume any power whatsoever?
Yes, although often (but not always) it is a relatively small amount of power (20 watts or so).
Put your hand on the case above the power supply of a computer that has been off for a while and you will often still feel warmth as the PS supplies the standby power.
Sunday, June 07, 2009
Monday, October 06, 2008
Affordable new local search website
Thursday, September 04, 2008
ZBot trojan attached to flight ticket confirmation
Subject:Your Online Flight Ticket N 49444
Greetings, Thank you for using our new service "Buy airplane ticket Online" on our website. Your account has been created:Your login: israel@leichtman.net Your password: passR5AW
Your credit card has been charged for $601.66. We would like to remind you that whenever you order tickets on our website you get a discount of 10%!
Attached to this message is the purchase Invoice and the airplane ticket. To use your ticket, simply print it on a color printed, and you are set to take off for the journey!
Kind regards, Southwest Airlines
If you get such an email DO NOT OPEN THE ATTACHMENT
Attachments are .zip files with filename E-ticket_N7399294.zip (random number) with inside a E-ticket_N7399294_and_Invoice_for_N73992943442.exe.
On an infected computer the trojan will create a new files like %System%\ntos.exe, %System%\wsnpoem\audio.dll, %System%\wsnpoem\video.dll and creates a new directory %System%\wsnpoem.
It also adds and modifies entries in the Windows registry and make connection with a server for http://*********.ru/alaska/alaska.bin. It opens random TCP ports in order to provide backdoor capabilities.
Thursday, August 21, 2008
Hacking autorun for USB flash drives
How to: Quick intro to hacking autorun for USB flash drives
Autorun will not work with ?regular? USB flash drives the way that they do with CD-ROMs, but there are some tricks that you can do that will come very close. I say ?regular? in that as many may know there are ways of modifying U3 drives so that they appear as CD-ROMs on Windows systems and can thus use autorun to silently run your ?tools? without any indication anything is happening. The U3 hack however is a bit more complicated, I will do another ?How to? on that later. For now let?s just discuss how we can create an autorun.inf file on a regular ?ol USB flash drive that will do some interesting things.
Also it is important to mention that some of these techniques will even work if autoplay is disabled!
First, although we cannot have an application run automatically with a traditional USB drive, we can make it so that when a USB drive is plugged we have Windows make a suggestion to the user and all they need to do is click ?OK? to a specific application or script you have deployed to the flash drive.
First in Notepad create a file called autorun.inf and save it to the root of your USB flash drive of choice. In the autorun file put this:
The first parameter is ?icon? this tells Windows what icon to use as the icon image for the drive etc. This is important for the social engineering portion of the trick, you must consider your target. The image you choose should help instill trust in the application they are about to run.
The ?open? parameter indicates the program you wish to run, this can be an executable, or as in this case a .bat file. You could even call a .bat file which calls a series of executables. Go crazy.
The next parameter is ?action? this is what will trigger the autorun dialog to appear. This text will appear in the dialog box along with your icon, so you probably want make this friendly, something like ?Fun Game,? you probably don?t want to put something like ?Click ?OK? to install backdoors and trojans!?.
Now unplug your flash drive and then replug it in, a dialog box like this should now appear:
So this is not as good as automatically running the application, but is useful nonetheless and there have actually been successful simulations where this has been used. A security consultancy used this technique as a proof of concept to test a credit union client of theirs. Several drives used this simple technique to run exectue a trojan that sent some simple data to an external email account. They scattered the drives in the parking lot, several employees picked the drives up on their way into work and within a short amount of time the email account they had set up was receiving emails.
Now we have our basic autorun.inf setup. But notice that if you click cancel and then click on the drive you just see the contents of the drive. However we can take this one step further, if the user is smart and their spidey senses are tingling from the dialog menu that appears and they click cancel, with the addition of one more line of code to the autorun.inf file that will automatically execute the code we specify when they click the drive either from ?My Computer? or Explorer. This is different than a true autorun as it still requires a user to take an action to exectue the application, but still a significant security risk.
Add these lines to your autorun.inf file
OK save it and then unplug and plug the drive back in again. This time when the prompt appears hit ?cancel?. Now go to double click the drive under ?My Computer?. The application will automatically execute. By the way, this second portion will still work even if autoplay is disabled on a system and is actually more dangerous than the dialog in my opinion.
So what if we don?t want to execute a command on the drive and just open a webpage? You could execute Explorer in your .bat file to do this, or in the exectuble you run, but there is a quick and easy way to do this in the autorun.inf file. Replace the last line with this instead:
