Symantec發佈20078月份威脅報告

The State of Spam
A Monthly Report – September 2007

August was an interesting month for spam observers with overall spam activity increasing by 3% to just under 70% of all email traffic, PDF spam recording highs and lows, and YouTube making a malicious entrance similar to recent Ecard spam tactics.

Highlights included:
• Spam Levels Inch Upwards. Overall spam levels at the SMTP layer in August increased averaging 69% of total email. This compared with 66% of total email in July.
• From Ecards to YouTube – Spammers continue to blast out a variety of attacks containing malicious URLs. This type of attack accounted for up to 15% of all spam in August
• PDF Spam, a Flash in the Pan? PDF and attachment spam proved to be August's flash in the pan. In early August, a dramatic increase in PDF spam was recorded, and at its peak, Symantec estimated that PDF spam accounted for nearly 20% of all spam. As August ended, a dramatic fall-off in PDF spam was recorded, accounting for less than 1% of all spam.
• Image Spam Maintains Steady Appearance. No major changes in image spam levels were observed in August as it continued to hover around 10% of total spam.

• Additional insight is provided below on the following tactics:
- Update: Spam messages containing URLS with Chinese domains
- 419 spam hasn't gone away
- Join the police force spam
- Chinese jigsaw training spam images
- Novel puppy scam email

For more detail please check http://www.symantec.com/