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Network Security Snort-Signatures
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[Snort-sigs] FPs for 4166 (Shell.Explorer) - "common" print functions

Subject: [Snort-sigs] FPs for 4166 (Shell.Explorer) - "common" print functions
Date: Wed, 11 Jan 2006 19:24:50 -0500
Getting lots of alerts on sid:416, "Shell.Explorer ActiveX Object Access". Using this object is perhaps walking on thin ice, but I am seeing it coming from what I would have thought to be legitimate sources. Are these just legitimate cases of questionable scripting style? Some of the flagged text from known sites:

jobsearch.ma.monster.com spits out this script fragment (3 different times):

{
var WebBrowser = '<OBJECT ID="WebBrowser1" WIDTH=0 HEIGHT=0 CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></OBJECT>';
document.body.insertAdjacentHTML('beforeEnd', WebBrowser);
WebBrowser1.ExecWB(6, 2);
//Use a 1 vs. a 2 for a prompting dialog box
WebBrowser1.outerHTML = ""; }


education.uoregon.edu gives us several variations of:

if (da && !pr && !mac) with (document) {
writeln('<OBJECT ID="WB" WIDTH="0" HEIGHT="0" CLASSID="clsid:8856F961-340A-11D0-A96B-00C04FD705A2"></OBJECT>');
writeln('<' + 'SCRIPT LANGUAGE="VBScript">');
writeln('Sub window_onunload');
writeln(' On Error Resume Next');
writeln(' Set WB = nothing');
writeln('End Sub');


www.smartcomputing.com (sic) has a similar fragment to monster.com's:

{
var WebBrowser = '<OBJECT ID="WebBrowser1" WIDTH=0 HEIGHT=0 CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></OBJECT>';
document.body.insertAdjacentHTML('beforeEnd', WebBrowser);
WebBrowser1.ExecWB(6, 2);//Use a 1 vs. a 2 for a prompting dialog box WebBrowser1.outerHTML = ""; }


In fact, after seeing that www.cisco.com also spit out something similar, they all contain variations of this function (finally got it all in one packet):

// Print Function
function printit(){ if (window.print) {
window.print() ; } else {
var WebBrowser = '<OBJECT ID="WebBrowser1" WIDTH=0 HEIGHT=0 CLASSID="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></OBJECT>';
document.body.insertAdjacentHTML('beforeEnd', WebBrowser);
WebBrowser1.ExecWB(6, 2);
// Use a 1 vs. a 2 for a prompting dialog box WebBrowser1.outerHTML = ""; }


And now after looking further still, all are variations on a procedure to print a document on various combinations of platforms and browsers.

Any further detail on what an "evil" incarnation of Shell.Explorer might contain to differentiate it from these examples?

Jeff


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