gHacks technology news » malicious http://www.ghacks.net A technology blog covering software, mobile phones, gadgets, security, the Internet and other relevant areas. Tue, 24 Nov 2009 23:31:44 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 NTFS Alternate Data Streams http://www.ghacks.net/2008/01/24/ntfs-alternate-data-streams/ http://www.ghacks.net/2008/01/24/ntfs-alternate-data-streams/#comments Thu, 24 Jan 2008 16:51:55 +0000 Martin http://www.ghacks.net/2008/01/24/ntfs-alternate-data-streams/ This article is going to explain NTFS Alternate Data Streams: what they are, where they are, how you can detect them, create them and how they are used by hackers. In short, NTFS Alternate Data Streams can be used by hackers to fork file data into existing files without altering the existing file’s function or size. You can guess where this is going, right ? They make it relatively easy to hide malicious code inside them which is much harder to detect.

Creating NTFS Alternate Data Streams is not complicated at all. You can use the “type” command to do that. To fork the file virus.exe into calc.exe you would use the command type virus.exe > calc.exe:virus:exe if they are in the same directory. Add the path if they are not. The size of the calculator does not change, the only indicator is that the file changed stamp is altered.

But executing those files must be harder, right ? Wrong again. To execute virus.exe you use the command “start”, in our example it would be start calc.exe:virus:exe.

A software like Stream Explorer can find those NTFS Alternate Data Streams on your hard drive. An alternative is List Alternate Data Streams

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]]> http://www.ghacks.net/2008/01/24/ntfs-alternate-data-streams/feed/ 3 Cross Site Scripting http://www.ghacks.net/2005/10/27/cross-site-scripting/ http://www.ghacks.net/2005/10/27/cross-site-scripting/#comments Thu, 27 Oct 2005 18:32:42 +0000 Martin http://www.ghacks.net/?p=68 Cross site scripting (also known as XSS) occurs when a web application gathers malicious data from a user. The data is usually gathered in the form of a hyperlink which contains malicious content within it. The user will most likely click on this link from another website, instant message, or simply just reading a web board or email message. Usually the attacker will encode the malicious portion of the link to the site in HEX (or other encoding methods) so the request is less suspicious looking to the user when clicked on. After the data is collected by the web application, it creates an output page for the user containing the malicious data that was originally sent to it, but in a manner to make it appear as valid content from the website.

Many popular guestbook and forum programs allow users to submit posts with html and javascript embedded in them. If for example I was logged in as “john” and read a message by “joe” that contained malicious javascript in it, then it may be possible for “joe” to hijack my session just by reading his bulletin board post. Further details on how attacks like this are accomplished via “cookie theft” are explained in detail below.

taken from “The Cross Site Scripting FAQ”. Click link to read the whole faq.

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