I'd look at the message and see if there is an html file link - <file://123.132.123.133/someshare/somefile.ext>. That would cause the user's e-mail client to attempt to authenticate to that external IP address and initially send the username/password hash. If the attacker is collecting those packets, they could be replayed into L0phtcrack or something similar and the passwords could be cracked. Another option would be to sniff the traffic from one of the affected hosts and see if the workstation tries to connect to some external Ip address when the message is viewed. I wouldn't worry too much about information leakage at this point 'cuz they've already sent the info out. Just don't log in as yourself or admin to do it....stick to the user who's already viewed the message and presumably sent their credentials. BTW, the solution for this is to block NetBIOS ports and the edge (and everywhere else;). -----Original Message----- From: Matt LaFelero [mailto:ramstrykeat_private] Sent: Wednesday, May 21, 2003 7:48 PM To: incidentsat_private Subject: Possible Intrusion Attempt? 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? ---------------------------------------------------------------------------- *** 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 ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- *** 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 - 10:39:22 PDT