Wednesday, May 07, 2008
Wednesday, May 07, 2008 11:44:12 AM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | Identity Theft )

A funny but O so true write-up from SANS (www.sans.org) on what NOT to do online.

1. Practice Unsafe Surfing. When you purchase a new computer, go online without activating the firewall, or purchasing protective software.

Further expose yourself digitally by sharing a wireless connection with the entire neighborhood. Without digital encryption, you can share the contents of your hard drive with anyone on the street. For maximum risk, do some online banking on a public computer -- like the one at the library or a public cafe. Bonus points are added if your Social Security number is your user ID for any transactions.

What you should really do:
  • Use a hardware firewall at work and at home along with good AV software that is kept up to date.
  • While the desire to go 'Wireless' is high and the products make is so easy take the time to set it up properly or call in an expert to set it up for you.
  • Never do more than just check news stories on some basic searching when on an unknown and thus un-trusted computer be it at the library or even over at your friends house.

2. Skimp on anti-virus and anti-spyware protection. Courting disaster online is easy. Invite malicious code to attack your computer simply by doing nothing. Antivirus programs can be pricey, and the maintenance of constantly downloading updates is time-consuming. Combine that with the security updates from Microsoft or Apple and it's enough to seriously annoy anyone.

What you should really do:

Install a good Anti-Virus solution, most like F-Secure, come in a full protection suite and could be included free with your internet connection (Shaw includes F-Secure for example) Turn on automatic updates in Windows and if your programs can be set to do the same do so. Once a month manually check to ensure your programs are up to date with something like the online F-Secure Health Check or the Secunia Software Inspector. It wouldn't hurt to visit both Windows Update and Office Update while your at it.

3. Passwords are a pain! Make life easy for yourself by using the same password for EVERYTHING, and make it something easy to remember, like your first name or 'password'. Just in case, make sure you write it down on a yellow sticky and put it somewhere easy to see.

And don't forget to have your browser set to 'remember password' to make life easy for you - and the cyber thief.

What you should really do:
  • Use the idea of a password phrase to remember hard to guess passwords. A favorite phrase or poem can become the backbone of a secure password policy.
  • For Example the phrase 'The quick brown fox jumped over the lazy dog' can be used to easily remember a password of 'tqbfjotld'.
  • Make your password harder to guess by throwing in Capitalization, numbers and special characters.
    • If you want to keep things simple then come up with at least three or four secure passwords.
    • The first would be used only for online banking. The second would be used for your e-mail. The third would be used anywhere you have to register to use a site. The fourth could be used for questionable sites that require you to register.

4. Peek at junk email and open attachments from unknown sources. Open attachments from strangers, secret crushes, long-lost friends saying "what's up," or strangers hawking cheap drugs -- you'll never know unless you peek at that email. One of the many fun things that can happen when you open an attachment containing malicious code is infecting your computer with a Trojan horse or virus, which can easily lead to identity theft.

What you should really do:

Use a service like CudaMail to filter out all these unwanted messages. They are either marketing messages or worse, spammers trying to add your computer to their botnet. Stay away from these messages no matter how 'interesting' the spammers make them.

5. Stuff your wallet with juicy identifying tidbits. Wallets and purses are more than just handy cash-carrying devices. They often have credit cards, identification, insurance information and even Social Security cards. Obviously, more is better if you'd like to become the prey of fraudsters.

Losing or misplacing a wallet or purse can cause more problems than just the hassle of replacing all those cards and buying a new bag. Armed with your date of birth, Social Security number and mailing address, there's no limit to the damage thieves could cause.

What you should really do:
  • Keep only what you need in your wallet or purse.
  • The rest of the information should be in a safety deposit box where you can get it if you need it but the rest of the time it is locked away.
  • Check on the personal information the credit bureaus have on you to make sure it is accurate and that someone hasn't signed up for a credit card or something else in your name but using a different address.

6. Make your checks payable to criminals. If you're like most people, you wouldn't post your checking account information on your front door, though you should if you'd like to be a victim of fraud. Similarly, checks reflecting the same information can be dropped casually into unsecured mailboxes. Statistically the chances of your mailbox being targeted by criminal elements are low, but not that low. According to the 2008 Identity Fraud Survey Report from Javelin Strategy and Research, almost 1 in 10 victims of identity theft who can pinpoint the scene of the crime say that it happened at the mailbox.

7. Opt out? Opt in! While you're mailing checks from the unlocked mailbox, go ahead and get credit card companies to send you all the pre-approved offers that the postman can cram into the box. Similarly, don't get credit card statements online; leave them on the side of the road so that they're more convenient for fraudsters who lack the technical knowledge or follow-through to launch complicated hacking schemes.

What you should really do:

Don't use the mailbox by your front door as an outbox just because it is convenient. Take your bills to the bank to pay or drop them off at a real post office. Anything you do get that has your identifying information on it like a pre-filled out credit application should go through a good cross cut paper shredder before leaving your place.

8. Nothing is too good to be true. Everyone wants to feel special and maybe more importantly, filthy rich. When reading an emailed proposition from an African business tycoon, an imperiled prince or downtrodden heiress offering millions of dollars in exchange for some small measure of assistance, it's difficult not to wish it were true. Falling for the story will undoubtedly lead to unpleasantness.

What you should really do:

Don't let your greed get the better of you. While the 'I have umpteen million dollars that I'm trying to sneak out of the country' e-mail's are getting old hat people are still falling for them. What is more insidious is the 'work at home as an agent' e-mail's that make it sound so easy. All you have to do is deposit a check or two each week into your personal bank account and wire transfer the funds to 'the company'. You either end up out the entire amount when the check is returned NSF or you are working for organized crime and are a money launderer.

The internet is a wonder and scary place at the same time. Be educated and play safe.

- Shaun
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 Monday, April 28, 2008
Monday, April 28, 2008 1:51:12 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | False Spam | Outlook Plug-In | Spam Filtering Service )
Mark - as the handler on duty at the Internet Storm Center - was nice enough to not only read all his spam for the week (about 2500 messages) but he also put together a nice chart showing what type of spam he was getting and from where:

Description

Email Origin

 

Greeting card

Germany

 

URL Link to exe.  28/33 AV products detected the file, three days ago it was 4.

Viagra/Cailis Mesages

Texas
Latvia
Paris
Russia
Chilli

Mount Laurel (US)
US
Italy
Israel

Links to Canadian Pharmacy web site.

Viagra/Cailis Meds

France

 

Web Site Canadian Healthcare

Movie downloads
(in Chinese)

Argentina

 

Nothing no links and nothing nasty, maybe a trial run.

Herbal remedies

USA
Germany

Sweden

Oman
Lithuania

Brazil

 

Products to enlarge body parts.

The message contained a URL to one of three sites hosted in the same address range.

The registrar owns 695 other domains, received 50 of them.

Lottery*

UK
Canada

Greece

 

So far this week I have won  about $500,000,000, not bad for not entering any lotteries.   The majority were sent from UK machines, machines at one particular facility.

Click Fraud

Spain
Bolivia

Poland

 

The links in the message are ad click redirects.

Paypal

US

France

 

The usual phishing exercise aimed at extracting account information.

I am Lonely Tonight

Turkey

 

The usual I’m lonely tonight emails.  If you respond it goes into how she wants to travel and can’t you help her out.  

Fake Goods

Bombay
Russia

Bahrain

Greece

Italy

Turkey
Slovak Republic

Thailand

Fake goods, watches, bags, etc. 

Business Proposal (419 messages)

US
Germany
Los Angeles

United Arab

Emirates

The Netherlands
Japan

Transfer money and get a percentage.

Work offers

Belgium

 

Work for a few hours per week and make thousands,  most of these linked to professional looking sites.   Typically they are recruiting for mules.

Threats

Turkey

Russia

There have been a few variants of these doing the rounds.


> Source: http://isc.sans.org/diary.html?storyid=4343

This is a lot of work that Mark has gone through but it does highlight the value of good metrics or ways of gauging how effective an anti-spam system is.

Here at the CudaMail support desk we occasionally get a client who at first is very upset that they got 5 spam messages in their inbox this morning and can't we do something about it? They are usually very thankful when we provide them with a report similar to the one below for their domain showing that tens of thousands of messages have already been blocked for them and these 5 messages are the start of a new campaign that they were lucky enough to get the first few messages from and now that they have provided us with some samples to work with we can stop this campaign in it's tracks too.

Sample CudaMail Spam Quarantine Summary



> Click CudaMail_Summary_for_Domain.pdf (12.76 KB) for to download the PDF sample

This also highlights the different perceptions we have as anti-spam specialists and the typical end-user or client. From our perspective we are fighting the good fight and our efforts are winning the war on spam. We block millions of messages a day and allow only a few 10's of thousands to be delivered to the client. Typical statistics are that on average 97 out of every 100 messages are spam and this is with a very low false positive rate (false positive = marking a wanted message as spam).

What is The Customer's Perspective On The Same Volume of Messages?

They are going about their important work without being bothered by those 97 out of 100 messages that are spam so when a few messages slip through to them all of a sudden they are being "flooded" with spam. Same numbers but a very different perspective on the issue.

What Can You - the CudaMail End-User - Do to Help Out?

1. Keep us in the loop. "One person's spam is another person's ham" as the saying goes so we don't know what you did or did not sign up for online. We maintain a number of spam traps and are always looking for new spam messages but may not be first in line when a spammer fires up his money making spam bot and sends out the latest surge. So if you are the lucky one to be fist on the spammers list and get a spam sample there are two very good ways to provide this feedback to CudaMail support.

2. Install and use the Outlook plug-in. For those of you who use Microsoft Office with the full Outlook e-mail client the Plug-in is the easiest way to send spam samples back to CudaMail support and we have blogged about this before. There are plug-ins available now for other e-mail clients (Thunderbird 2.x and Lotus Notes 6.5, 7 and 8) but these are under going beta testing right now.

You can read me Blog post about it by going here:


3. Debug-ID. For those who don't run Outlook or don't want to run a beta plug-in you can simply forward just the Debug-ID of the unwanted messages to the support@CudaMail.com address.

A quick 'How to display full headers in client x' can be found at the following URL:
While support only needs the one line with the X-ASG-Debug-ID: number on it go ahead and forward all the information in the full headers on to us. What you do not want to do is forward the spam message body along with the full headers. What happens more often than not is that the CudaMail system will take your spam sample re-processes it and block it before it gets to support. We don't know that you were trying to send us this sample and can't do any thing about it because we didn't get it in the first place. Now typically we don't respond to every message providing a spam sample but we do review each and every one of them and make sure that he system will block them in the future.

With the above two thoughts in mind - perspective and feedback - what do you - the CudaMail client - want to see from the CudaMail system? Do you want to be sent reports on a regular basis (Daily, Weekly or Monthly) or will this just add to your information overload?

We look forward to hearing from your either in the comments below or direct to support@CudaMail.com.

- Shaun

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 Thursday, April 10, 2008
Thursday, April 10, 2008 3:32:21 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | McAfee | S.P.A.M. | Spam Stats )
Don't get enough spam already and think you should get more? Then you will probably feel jealous of the 50 participants of McAfee's global Spammed Persistently All Month (S.P.A.M.) of April. These 50 regular Joe's ranging from 17 year old high school students (Hello Zach) to a mother of three (Zach's Mom Tracy) and a university student (Katya) among others in all areas of the globe are the guinea pigs in this experiment to run throughout April 2008.

Basically these participants have been given a dedicated laptop, a pre-paid credit card and a mission. Their mission is to do everything wrong and see what the results are. They are going to respond to Spam messages - buy the 'Genuine Replica Watches' on-line and sign up for everything they can and see what happens. William reported on Day 2 that without any protective software running he received 160 Spam messages and is getting pop-ups and browser hijacks 'on a regular basis'. The Blogs are a very interesting read.

Here Are My Predictions:

1. The laptops that these people are using will become a "willing soldier" in one of the Spam Bot armies lurking out there and may end up sending themselves (and us) more Spam. How is that for irony?

- Collectively the top botnets are capable of sending over 100 billion Spam messages per day*

2. Malware - The laptops will have to be wiped and re-installed for everyone at least once during the month. They are going to do this anyway for the participants at the end of the experiment before they get to keep them so this will be good practice. I'm not sure I would trust these laptops even after they are wiped though with the rootkits that are now being incorporated into the Bot software. Reports are coming in already that the laptops are slowing down and becoming unresponsive.

3. Massive consuption of time - the management of this Spam will take more and more time until these participants will not be able to do anything but read and reply to e-mail all day long.

4. Cyber Crime - all the participants have been given 'new identities' just like someone in the witness protection program to use online. I predict that some of these identities will be sold on the black market and thus stolen.

McAfee is of course going to use this experiment to advertise that there is a lot of Spam out there and that you need protection but I could have told you that - just look at the CudaMail statistics page. ;)

- Shaun

* Source: www.secureworks.com/research/threats/topbotnets/?threat=topbotnets

For More Information:

www.mcafeespamexperiment.com
www.echannelline.com/canada/printer.cfm?item=DLY040708-2

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 Wednesday, April 02, 2008
Wednesday, April 02, 2008 3:26:26 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | Barracuda Spam Firewalls | CudaMail | MX Backup | Spam Filtering Service )
Let's talk about what you can to do help make your e-mail both more reliable and keep Spam out of your client's mailboxes.
 
First, most people have this idea that e-mail is both near instant and 100% reliable - unfortunately, both of these ideas are 100% wrong!

The SMTP protocol was designed when Internet links were both unreliable and slow, therefore the protocol was built to be resilient and to retry failed messages. However, the link speeds have now increased and have become more reliable, therefore people have gotten used to their e-mail arriving really quickly and so they have come to the unreasonable expectation that e-mail is near instant and 100% reliable.

Let's look at a couple of scenarios that will show that this is not the case as well as address some ways to increase your control over your e-mail server's level of reliability.
 
Case 1 - Single Mail Exchanger
 
A lot of e-mail domains right now have only 1 Mail eXchanger (or MX record) typically pointing to a single mail server at the head office.

So what happens if your internet connection goes down or there is some "hiccup" with the mail server or your firewall (you do have a hardware firewall don't you?). Anyone who tries to e-mail you will not be able to and the sender may get an undeliverable messages (or not) from their mail server after some period of time.

The Sending mail server should be configured to retry this message to you a number of times at some interval both of which are set solely by the administrator of the sending mail server. In other words, you have no control over how often they will try again or for how long and it will be different for each and every mail server that is trying to send to you. Talk about a troubleshooting nightmare!
 
Case 2 - Backup Mail Exchanger

When you publish an MX record via DNS one of the properties of the record is a preference. Here is an example (fictitious) domain and the tools you would use to see what your MX record points to:
 
nslookup -type=mx somedomain.com
Non-authoritative answer:
somedomain.com        MX preference = 10, mail exchanger =
mail.somedomain.com
somedomain.com        MX preference = 99, mail exchanger =
smtp.SomedomainISP.com
 
What the above record is saying is that when sending e-mail to 'yourbuddy@somedomain.com' to first try sending it to the mail server named 'mail.somedomain.com' and if that fails to try and send the e-mail through the mail server named 'smtp.SomedomainISP.com'. Your ISP may even include this service for free if you ask them, however these 'store and forward' backup mail servers typically just accept and forward messages WITHOUT anti-spam processing and since they are from a trusted source (your ISP) most mail servers are configured to accept without further processing.

Guess what? The Spammers are aware of this little fact and will, in violation of the standard, try to send e-mail to your domain through your backup or secondary MX record. This is how a lot of Spam sneaks in today - it takes the back door and doesn't get challenged by the security guard at the front door - your primary anti-spam solution.

So what is the solution to this problem?

Case 3 - Spam filtered MX Backup service.

Make sure your backup or secondary MX record points to a system or systems that are as hard on Spam as the protection on or in front of your mail server. This is the reasoning behind our CudaMail MX Backup Service.

We (Optrics Engineering) have been Barracuda Diamond Partners for a number of years and have seen the above problems (Case 1 and Case 2) a number of times with the clients we deal with and are offering not just an MX backup service but a Spam Filtered MX Backup Service. We have a redundant cluster of Barracuda Spam Firewalls that we use to provide primary anti-spam protection for smaller organizations but can use these same servers to accept, scan for Spam and deliver to your mail server in the event that your anti-spam solution goes off-line or your Internet connection or firewall has an issue.

This cluster is configured to retry delivery to your mail server every 15 minutes for up to 48 hours. Those pesky Spammers who try to sneak in through the back door are going to be very surprised when they run into the CudaMail service on your secondary MX records and you now know how often and how long you have before people get an 'undeliverable' response back.

While e-mail is not 100% guaranteed the above service puts you in control and slams the door in the face of the Spammers.

Now go have a nice (Spam-free) day!

- Shaun

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 Tuesday, April 01, 2008
Tuesday, April 01, 2008 8:53:40 AM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | April Fool's Day | CudaMail | Spam | Threats )
April Fool's Day is upon us - don't be an e-mail fool - as the Spammers will be trying to take advantage of our love of a good laugh.
 
As always be very careful when you get an e-mail that you don't expect. Just last week my own wife sent me a video via e-mail and the first thing I did was call her and ask if she had sent it to me. It turns out she had but it could easily be an e-mail containing Spam/malware like the latest storm being reported on by the Internet Storm Center.

Storming into April on Fools Day

http://isc.sans.org/diary.html?storyid=4222

Here are some subject lines to watch out for (there may be more variations):

  • All Fools' Day
  • Doh! All's Fool
  • Doh! April's Fool.
  • Gotcha!
  • Gotcha! All Fool!
  • Gotcha! April Fool!
  • Happy All Fool's Day.
  • Happy All Fools Day!
  • Happy All Fools!
  • Happy April Fool's Day.
  • Happy April Fools Day!
  • Happy Fools Day!
  • I am a Fool for your Love
  • Join the Laugh-A-Lot!
  • Just You
  • One who is sportively imposed upon by others on the first day of April Surprise!
  • Surprise! The joke's on you.
  • Today You Can Officially Act Foolish
  • Today's Joke!
The e-mails either contain or have links to a nasty malware payload.

The download is a binary, also with varying names:

foolsday.exe
funny.exe
kickme.exe

In your e-mail it will look something like this:

April Fool's Day http://276.233.234.297 <= This is an invalid link intended to be harmless

CudaMail blocks .EXE attachments by default so anyone using our CudaMail managed anti-spam service is not going to be getting any of the malware payloads but some of the links may slip through.

We are blocking new variants as quickly as they are discovered but the best defense is to be educated to not click on unsolicited links.

Consider yourself educated. :)

- Shaun

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About the author

Shaun Sturby, MCSE Shaun Sturby, MCSE
Technical Services Manager, and Optrics' point person for email security

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