Matt LaFelero wrote: > > I'm hoping someone here might be able to shed some light on this > situation.. > > Some of my users have been getting some interesting spam mail. This is > the first time I've ever seen a spam mail do this. When the user opens > the spam mail, all of a sudden, an Internet Explorer authentication > boxes pops up. You know those that ask for username, password, and > domain. > > Well, I run MS Proxy 2.0 here and the logon with a 2KPro machine is > integrated so the user never sees this box or has to enter his/her > password to get on the Web. > > It's strange that this email triggers the authentication box. What's > even weirder is that it populates the username for them, with weird > names. The names always seem to change from spam mail to spam mail. I've > seen iterations like fluff, skank, morton, taxiway.. you name it. > > It seems most of the emails are HTML, which can explain a lot. None of > them had attachments. From what I could gather it seems to attempting to > load a site. We run Outlook 2000 with SP3 and all hotfixes. > > My question is, how is this happening and is it a threat? I'd be interested in seeing the source of the mail message to see if it contains script or a link to an image or other material on a protected web server page. One could follow that link, view source, and/or capture traffic and see what is happening. Internet Explorer will offer its local authentication credentials (Windows or domain login) to web sites under some circumstances. Internet Explorer's default security setting for login in the Internet zone says IE will only automatically try to login in the local Intranet zone. So unless they are exploiting a defect in the zone boundaries, of which there have been quite a few, they wouldn't seem to be able to collect credentials from an Internet site. -- Gary Flynn Security Engineer - Technical Services James Madison University Please R.U.N.S.A.F.E. http://www.jmu.edu/computing/runsafe ---------------------------------------------------------------------------- *** Wireless LAN Policies for Security & Management - NEW White Paper *** Just like wired networks, wireless LANs require network security policies that are enforced to protect WLANs from known vulnerabilities and threats. Learn to design, implement and enforce WLAN security policies to lockdown enterprise WLANs. To get your FREE white paper visit us at: http://www.securityfocus.com/AirDefense-incidents ----------------------------------------------------------------------------
This archive was generated by hypermail 2b30 : Fri May 23 2003 - 10:30:11 PDT