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Eye Witness Report
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On a site that suffered from a rather juvenile, yet interesting, attack, we found that an outsider sent someone in the organization a fakemail (email for which the source email address is not authentic) with SubSeven attached Many hackers use the trojan backdoor, Windows-based SubSeven to gain unlawful remote access to networks It allows users to upload and download files from the victim machine, manage files, and even erase hard drives and other disks The organization had Norton AntiVirus Corporate Edition 75 running on its Exchange server, but it failed to detect this incoming trojan (under normal operation, it does detect the SubSeven trojan), because the anti-virus software had become a hung process on the overtaxed Exchange Server machine Therefore, the SubSeven trojan was not quarantined and logged at the Exchange Server machine The message was delivered A quick review of the recipient s machine a few weeks later revealed that she had indeed attempted to execute the SubSeven attachment, which had some innocuous name with an exe extension The good news is that the Norton AntiVirus program on the recipient s machine automatically deleted the SubSeven attachment and logged the time and date that it had been detected The bad news is that without this attachment, we would never know what port the SubSeven backdoor was configured to listen on Here is the setting we found on the victim machine
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Incident Response & Computer Forensics
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Eye Witness Report (continued)
A much better setting for incident response is to deny access to the infected file, but not delete it If the recipient s anti-virus program had this setting, the file would have been quarantined, and we could have done tool analysis on the attacker s SubSeven variant Then the victim site could have proactively scanned its network to determine if the trojan had been successfully installed As with most logs, the IIS log is stored as a text file So, even if you chose to log every attribute, you wouldn t use up too much hard drive space When in doubt, log too much rather than too little
Building Up Your Host s Defenses
If all hosts were completely secure, many security incidents would be avoided Pre-incident preparation should not omit adding to your host s defenses Actions taken to secure hosts will not only reduce the exposure to security incidents, but will also increase the ease with which investigators can resolve incidents Although this is not a book on host security, we feel obligated to mention the three cornerstones of secure hosts: M Make sure that all operating system and application software is the most recent Use the latest release and make sure that all patches, hot fixes, and updates are installed Disable unnecessary services If you are not using an application or network service, it should not be running Unnecessary services introduce unnecessary risk When faced with configuration choices, choose wisely Many security exposures are introduced through sloppy system administration
For a complete discussion of secure host configuration choices, refer to a book devoted to that subject Some of our favorites include the bible of Unix security, Practical Unix and Internet Security, 3rd Edition, by Simson Garfinkel, Gene Spafford, and Alan Schwartz (O Reilly & Associates, 2003); Maximum Linux Security: A Hacker s Guide to Protecting Your Linux Server and Workstation (Sams, 1999); and Microsoft NT 40 Security, Audit, and Control, by James Jumes, et al (Microsoft Press, 1999)
GO GET IT ON THE WEB Solaris support: http://sunsolvesuncom Microsoft Product Support Services: http://supportmicrosoftcom
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Preparing for Incident Response
Red Hat security: http://wwwredhatcom/apps/support Debian security: http://wwwdebianorg/security Silicon Graphics, Inc (SGI) security: http://wwwsgicom/support/security OpenBSD security: http://wwwopenbsdcom/securityhtml FreeBSD security: http://wwwFreeBSDorg/security/indexhtml SecurityFocus Online (security links): http://wwwsecurityfocuscom Security links: http://packetstormsecuritynl
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