Symantec Corp. has released its eighth volume of the Internet Security Threat Report, one of the most comprehensive sources of internet threat data in the world. The semi-annual report, covering the six-month period from 1 January to 30 June 2005, identified new methods of using malicious code for financial gain with increasing frequency to target desktops rather than enterprise perimeters.
During the first half of 2005, malicious code that exposed confidential information represented 74 percent of the top 50 malicious code samples reported to Symantec, up from 54 percent in the previous six months.
“Attackers are moving away from large, multipurpose attacks on network perimeters and toward smaller, more targeted attacks directed at web and client-side applications,” said Richard Batchelar, country manager, Symantec New Zealand. “As the threat landscape continues to change, users need to be diligent in keeping systems up-to-date with security patches and security solutions.”
Additionally, bot networks and custom bot code were available for purchase or rent; Symantec observed an average of 10,352 active bot network computers per day, an increase of more than 140 percent from the previous reporting period’s 4,348 bot computers. As the financial rewards increase, attackers will likely develop more sophisticated and stealthier malicious code that will be implemented in bot features and bot networks, some of which could attempt to disable antivirus, firewalls and other security measures.
Modular malicious code - malicious code that has limited functionality initially but then downloads additional functionality once a system has been infected - is also increasing. The shift toward modular malicious code is significant as it indicates that attackers may be attempting to avoid detection and attempting to compromise a system further by opening back doors on an infected system or visiting web sites where further malicious code can be retrieved and placed on the target system.
The report also found that phishing attacks continue to proliferate. The volume of phishing messages grew from an average of 2.99 million messages a day to 5.70 million. One out of every 125 e-mail messages scanned by Symantec Brightmail AntiSpam was a phishing attempt, an increase of 100 percent from the last half of 2004. Symantec Brightmail AntiSpam antifraud filters were blocking more than 40 million phishing attempts per week on average, up from approximately 21 million per week at the beginning of January.
Symantec observed that denial-of-service attacks grew from an average of 119 per day to 927 per day during the first half of 2005 - a 680 percent increase over the previous reporting period. The most frequently targeted industry was education, followed by small business and financial services.
The time between the disclosure of a vulnerability and the release of associated exploit code decreased from 6.4 days to 6.0 days. In addition, an average of 54 days elapsed between the appearance of a vulnerability and the release of an associated patch by the affected vendor. This means that, on average, 48 days elapsed between the release of an exploit and the release of an associated patch; during this time, systems are either vulnerable or administrators are forced to create their own workarounds to protect against exploitation.
Adware, spyware and spam continue to propagate, according to the report. Eight of the top 10 adware programs were installed through web browsers. Of the top 10 adware programs reported, five hijacked browsers. Six of the top 10 spyware programs were bundled with other programs and six were installed through web browsers.
The company also points out that spam made up 61 percent of all e-mail traffic and that 51 percent of all spam received worldwide originated in the United States.