Monday, December 12, 2011

Why Email attachments can be dangerous?



Festive season is on. Online e-commerce sites are busy attracting users. Similarly Spammers are also prepared to utilize the season for spreading spam and malwares. Recently I got a mail from Coca Cola(spam ofcorse) which said that I won lots of dollars( it ws so much that I dont remember the exact amount). It had a malicious pdf attachment. Hiding malicious codes inside pdf has become a prime target to bypass email filters. So I thought of writing an article on malicious email attachments.



Why can email attachments be dangerous?

Some of the characteristics that make email attachments convenient and popular are also the ones that make them a common tool for attackers:
  • Email is easily circulated - Forwarding email is so simple that viruses can quickly infect many machines. Most viruses don't even require users to forward the email—they scan a users' computer for email addresses and automatically send the infected message to all of the addresses they find. Attackers take advantage of the reality that most users will automatically trust and open any message that comes from someone they know.
  • Email programs try to address all users' needs - Almost any type of file can be attached to an email message, so attackers have more freedom with the types of viruses they can send.
  • Email programs offer many "user-friendly" features - Some email programs have the option to automatically download email attachments, which immediately exposes your computer to any viruses within the attachments.
What steps can you take to protect yourself and others in your address book?

  • Be wary of unsolicited attachments, even from people you know - Just because an email message looks like it came from your mom, grandma, or boss doesn't mean that it did. Many viruses can "spoof" the return address, making it look like the message came from someone else. If you can, check with the person who supposedly sent the message to make sure it's legitimate before opening any attachments. This includes email messages that appear to be from your ISP or software vendor and claim to include patches or anti-virus software. ISPs and software vendors do not send patches or software in email.
  • Keep software up to date - Install software patches so that attackers can't take advantage of known problems or vulnerabilities. Many operating systems offer automatic updates. If this option is available, you should enable it.
  • Trust your instincts - If an email or email attachment seems suspicious, don't open it, even if your anti-virus software indicates that the message is clean. Attackers are constantly releasing new viruses, and the anti-virus software might not have the signature. At the very least, contact the person who supposedly sent the message to make sure it's legitimate before you open the attachment. However, especially in the case of forwards, even messages sent by a legitimate sender might contain a virus. If something about the email or the attachment makes you uncomfortable, there may be a good reason. Don't let your curiosity put your computer at risk.
  • Save and scan any attachments before opening them - If you have to open an attachment before you can verify the source, take the following steps:
Be sure the signatures in your anti-virus software are up to date
Save the file to your computer or a disk.
Manually scan the file using your anti-virus software.
If the file is clean and doesn't seem suspicious, go ahead and open it.

Apart from these there are some of my older posts which can be useful for you:


DARKLORD!!



4 comments:

  1. I always wondered about those things

    ReplyDelete
  2. @Anna : thats good..the more you are aware, the less are the chances that you can get attacked..

    ReplyDelete
  3. These types of blog post Coca Cola(spam ofcorse) which said that I won lots of dollars( it ws so much that I dont remember the exact amount) are always attractive and I am pleased to find so many excellent point here in the blog post, writing is just great, appreciation for sharing.

    ReplyDelete