Dealing with Spam. February 16, Marc Berger SRJC Information Technology. Tuesday, April 10, 12
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1 Dealing with Spam February 16, 2012 Marc Berger SRJC Information Technology
2 Overview How Information Technology handles and Spam What you can do about and Spam Cloud-based
3 What exactly is spam? Unsolicited bulk sent indiscriminately Different forms: Unwanted mailing lists, phishing attacks to gain information, form s searching for business The name spam is derived from the 1970 Monty Python spam sketch!
4 How IT handles Mail Routing - i.e. How does get into SRJC? Server-level Spam detection and blocking Maintenance, backups, virus protection, and monitoring
5 Mail Routing 1. Internet 2. Firewall 3. IronPort 6. Client 4. SpamAssassin & Virus checking 5. Exchange
6 Mail Routing Firewall - Blocks gross spam offenders IronPort - Blocks spam offenders based on rules, whitelists, blacklists, with a constantly updated database of known offenders SpamAssassin - Filters and blocks spam based on content with additional control based on user preferences Virus check - Detects and removes viruses in attachments and bad code in
7 Spam Statistics How much are we talking about? Spam prevented at the server Potentially good allowed through 1. Server antivirus scan - 10% strips out bad attachments and bad code 90% 2. Delivered to user for more granular control
8 Spam Statistics Spam prevented at the server Potentially good allowed through 60,000 messages! This chart just shows one server. It has a twin that is doing the same amount of work. If we only used one, and it stopped working, imagine the number of messages everyone would be bombarded with!
9 Spam Statistics IT dynamically preprocesses roughly 120,000 ~ 150,000 messages each day! This yields about 10,000 to 12,000 possibly good s delivered to our mailboxes
10 Storage and Backup IT backs up every night Retention policies in place Rough cost per terabyte (TB) ~ $14,000 Enterprise grade hardware Redundancy
11 Questions? Coming up: what you can do about spam
12 What You Can Do About 1.Set SpamAssassin Preferences 2.Client Filters or Rules @ 4.
13 1. SpamAssassin
14 SpamAssassin Scans and marks based on content at the server level Score - Each is scored based on the content of the message Whitelist / Blacklist - Users can specify who can send them and who cannot
15 Weird repeated doublequotation marks Attempts to disguise the word 'viagra' Sender is confirmed spam source Subject is all capitals Subject contains "Your Bills" or similar Talks about price per dose Talks about lots of money Message body has 80-90% blank lines SpamAssassin Scores Based on Talks about Oprah with an exclamation! Subject contains a gappy version of 'xanax' Attempt to obfuscate words in spam Subject line starts with Buy or Buying Content Join Millions of Americans Over 700 of these body and Phrase: lower your monthly payments header tests are run per message! Subject contains "Your Family" Information on getting larger body parts
16 SpamAssassin Scores Any time content matches a test, SpamAssassin adds a number to the score The higher the score an receives, the more spammy a message seems Note: SpamAssassin ignores s that are sent to multiple recipients
17 Setting SpamAssassin Scores On your personal SpamAssassin preferences, you can set the score a message must receive before being tagged as spam A larger score means more spammy content gets through - less s are marked as spam A smaller score means less spammy content gets through - more s are marked as spam
18 SpamAssassin Example SpamAssassin identified this as spam by using asterisks and the word SPAM in the title Notice the scores on the left side
19 Whitelist / Blacklist Whitelist - Always allows from someone you have approved, despite a high SpamAssassin score Blacklist - Never allows from someone you have denied
20
21 SpamAssassin Preferences Demo!
22 2. Client Filtering
23 Inbox Zero Good rule of thumb: When you check your and find yourself groaning "Ugh, this again?" consider creating a filter. A filter is ultimately best at shunting away the really unimportant stuff -- you are the only one who's got the qualifications and wetware to decide what happens to important items. That's why you get the big bucks. -Merlin Mann, 43 Folders
24 Client Filtering Not all of us can achieve Inbox Zero, but we can strive to get close Filters or rules allow us to tailor what we see and when Filter based on subject, sender, message content, and much more
25 How to set up Client Filters or Rules santarosa.edu/ /rules
26 Rule Examples Tell your students to always place your class section number in the subject line and then filter them into a folder Filter specific people or groups of people into folders to help keep track of different departments or projects Filter mailing lists and newsletters
27 Rules Demo!
28 3. Identifying Spoofing Phishing Attacks Domain Name Grammar Lists Canned (Form)
29 Spoofing Sender address and other parts of the are altered to appear as though the originated from a different source The protocol SMTP doesn't provide any authentication - it s easy to impersonate and forge s SMTP - Simple Mail Transport Protocol (key word here is Simple ) Can originate from spammers directly or malware/ spyware infested Zombie computers
30 Spoofing Zombie computer - a compromised computer under the control of a computer program to gather data For example, this can cause a local computer address book to become compromised, allowing spammers to send s to people in the address book Receivers think it is someone they know sending them an , but it really is a malicious program Joe Job - Flood of a huge number of s from a spoofed address, i.e. - denial of service attack
31 How to Stop Spoofing You can t It is, unfortunately, one of the main issues in If you know the person (friend, student, etc) contact the sender via another method (phone, etc.) to let them know their computer may be compromised DO: Use rules and SpamAssassin
32 Phishing Attacks s specifically targeted to fool you into giving up information They ask for usernames, passwords, login information, credit card numbers, and more Examples: Banking sites, mortgage offers, Help Desk account has expired, credit report information Never respond to a phishing attack Spear Phishing - Directed attack with personal information included, harder to detect!
33 ? So, how can we tell if it is a phishing attack??
34 Phishing Attack Example 1
35 Phishing Attack Example 1
36 Phishing Attack Example 2
37 Phishing Attacks - Hidden Links 1. DO NOT click the link 2. Hover your mouse cursor over the link 3. In this example, that click here link would have taken you to http : // azxdjuv. tk 4. This is obviously NOT and NOT cornell.edu either!
38 Compare these to a real example:
39
40
41 Dealing with Phishing Attacks 1. Learn how to detect a phishing attack A. Information from IT has links and addresses that reference santarosa.edu B. IT will never ask for your password C. If it is a bank you are associated with, contact the bank directly, not via any links in the 2. Communicate with coworkers A. Sometimes many people get the same at the same time 3. NEVER respond to a phishing attack, delete the 4. Use the SpamAssassin blacklist
42 Domain Name Grammar www. santarosa. edu /it www Server santarosa Domain edu Top Level Domain (TLD) it Directory of files to display Easy trick to figure out where you are: Ignore everything after a slash, read right to left. 1. Domain name and Top Level Domain (TLD) are a unique identifier 2.Santa Rosa Junior College TLD is:.edu 3. Santa Rosa Junior College full domain name is: santarosa.edu 4. Used in URLs for Web sites as well as in addresses
43 Domain Name Grammar Examples of safe and spoofed domains OK! IT Web site secur .santarosa.edu online.santarosa.edu santarosa.edu.ca domain.com/santarosa.edu OK! OK! NOT OK! NOT OK! server Distance Education Web site.ca is TLD for Canada Anything after slash = directory, this is domain.com, not santarosa.edu
44 Lists If you are sure you subscribed to a list that you do not want to be a part of any longer, it is most likely okay to unsubscribe using the links in the Never unsubscribe from lists that you do not recognize - spammers look for legitimate addresses
45 Canned or Form Legitimate businesses sending bulk spam s asking for business For example, IT receives s all the time from software and hardware vendors, computer training companies, etc. Not necessarily spam? When in doubt - search online!
46 4. in Use your SRJC address for SRJC business only Do not use your SRJC address for social networking sites, shopping sites, and/or personal use Believe it or not: Legitimate companies DO sell your address!
47 Use an Alternate for Personal Use You can always sign up for a free account for personal use Free sites: Gmail, Yahoo, Windows Live, etc. Most likely you have an address through your ISP - Comcast, AT&T, Sonic.net, etc.
48 How does my address get on the spam lists? Social Networking sites - Facebook, etc. Social Networking embedded applications - surveys, games, etc. Shopping sites Published on any search engine friendly Web site (99% of them) - for example, santarosa.edu lists - newsletters for various companies
49 Cost of Social Networking For bundles of 1000 accounts: Facebook account with 10 friends or less - $25 Facebook account with 10 or more friends - $45 How the spammer feels after sending 100,000 s gained from hacked accounts? - Priceless Source: Verisign idefence,
50 Key Things to Remember That was a lot of information! Three simple takeaways: 1.Be alert and aware - take a moment to examine the s you receive 2.Use rules to filter messages 3.Set your SpamAssassin preferences
51 Cloud-based managed and hosted offsite Not going into detail today Google Gmail, Microsoft Office 365, etc. We are looking
52 Cloud-based Pros Larger storage Ubiquitous access Less administration * Spam prevention Cost savings * Cons Training impact Backup and restore ($$) Client support Network integration Legal requirements * Depending on outcome of our pilot testing
53 Questions?
54 Online Resources Main IT Web site: santarosa.edu/it Web site: santarosa.edu/ SpamAssassin Preferences How to create rules How to archive Smartphone Information santarosa.edu/ / spam/prefs santarosa.edu/ / rules santarosa.edu/ / archive santarosa.edu/it/ support/smartphones
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