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University Computing Services

Virus-checking & spam-tagging
for OTI/UCS e-mail servers


OTI/UCS is currently running MailScanner/Spamassassin to scan
incoming email for viruses and spam for the following e-mail domains:

@UCS.fsu.edu
@mailer.fsu.edu
@garnet.acns.fsu.edu
@fsu.edu
@admin.fsu.edu
@www.fsu.edu
@cob.fsu.edu
@coss.fsu.edu
@lists.fsu.edu
@oddl.fsu.edu
@lpg.fsu.edu
@nursing.fsu.edu
@ww2.fsu.edu
@mail.theatre.fsu.edu
@admin2k.fsu.edu
@mail.otc.fsu.edu
@mail.research.fsu.edu

This MailScanner setup blocks the delivery of e-mail messages with viral payloads, attachments containing certain proscribed file types and attachments with certain proscribed filename extensions. Also, each e-mail message is processed by SpamAssassin and, depending on the total score assigned, is handled accordingly. The prefix {SPAM?} is added to the contents of the Subject: header line of mail that has a probability of being spam, and mail that has a high certainty of being spam is deleted without being delivered.

The prefix {DISARMED} is added to the contents of the Subject header line of mail that in which MailScanner has disarmed' certain HTML tags. The tags that are impacted are <IFrame> tags and <img> that are thought to be WebBugs. The webbugs are very small images used to track whether a messages has been read and <IFrames> allow various Microsoft Outlook security vulnerabilities to remain unprotected (but are commonly used in Mailing Lists).

Additional MailScanner and filter help available with:

Outlook   and   Eudora



Below is the list of the filename and filetype rules that UCS is filtering
out due to possible virus infection:

Filename rules:
Files with very long filenames (over 150 characters)
Filenames that contains lots of whitespace (over 10 characters in a row)
Filenames trying to hide its real extension by adding a CLSID (e.g. {testhta.txt.{3050F4D8-98B5-11CF-BB82-00AA00BDCE0B})


pretty park.exe             "Pretty Park" virus
happy99.exe                "Happy" virus
webpage.rar                  I-Worm.Yanker virus attachment

*.ani Possible buffer overflow in Windows (Windows animated cursor file)
*.bat, Possible malicious batch file script
*.bmp Possible buffer overflow in Windows (Windows bitmap file)
*.ceo WinEvar virus attachment
*.chm Possible compiled Help file-based virus
*.cmd Possible malicious batch file script
*.cnf Possible SpeedDial attack
*.com Windows/DOS Executable
*.cpl Possible malicious control panel item
*.cur Possible buffer overflow in Windows (Windows cursor file)
*.exe  Windows/DOS Executable
*.hlp Possible buffer overflow in Windows (Windows help file)
*.hta Possible Microsoft HTML archive attack
*.ico Possible buffer overflow in Windows (Windows icon file)
*.ins Possible Microsoft Internet Comm. Settings attack
*.its Dangerous Internet Document Set (according to Microsoft Q883260)
*.job Possible Microsoft Task Scheduler attack
*.jse Possible Microsoft JScript attack
*.lnk Possible Eudora *.lnk security hole attack
*.mad, *.maf, *.mag, *.mam, *.maq, *.mar, *.mas, *.mat, *.mav, *.maw Possible Microsoft Access Shortcut attack
*.mau Dangerous attachment type (according to Microsoft Q883260)
*.mda, *.mdz Dangerous attachment type (according to Microsoft Q883260)
*.mhtml  Possible Eudora meta-refresh attack
*.pif Possible MS-Dos program shortcut attack
*.prf Dangerous Outlook Profile Settings (according to Microsoft Q883260)
*.pst Dangerous Office Data File (according to Microsoft Q883260)
*.reg Possible Windows registry attack
*.scf Possible Windows Explorer Command attack
*.sct Possible Microsoft Windows Script Component attack
*.shb Possible document shortcut attack
*.shs  Possible Shell Scrap Object attack
*.scr Possible virus hidden in a screensaver
*.tmp Dangerous Temporary File (according to Microsoft Q883260)
*.vbe, *.vbs Possible Microsoft Visual Basic script attack
*.vsmacros Dangerous Visual Studio Macros (according to Microsoft Q883260)
*.vss, *.vst, *.vsw Dangerous attachment type (according to Microsoft Q883260)
   
*.ws Dangerous Windows Script (according to Microsoft Q883260)
*.wsc, *.wsf, *.wsh Possible Microsoft Windows Script Host attack
*.xnk Possible Microsoft Exchange Shortcut attack


File type rules:
self-extract -- No self-extracting archives
ELF -- No executables
executable -- No executables
MPEG -- No MPEG movies
AVI -- No AVI movies
MNG -- No MNG/PNG movies
QuickTime -- No QuickTime movies
Registry -- No Windows Registry entries

** Please keep your anti-virus software updated. The MailScanner should not be used as the sole means of blocking computer viruses on your computer.