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Drive-by Trojans exploit browser flaws

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Analysis Trojans - malicious programs that pose as benign apps - are usurping network worms to become the greatest malware menace. Sixteen of the 50 most frequent malicious code sightings reported to Symantec in the second half of 2004 were Trojans. In the first six months of last year, Trojans accounted for just eight of the top 50 malicious code reports.

Symantec blames Trojans for an upsurge in client-side exploits for web browsers. Trojans create the means to deliver malicious code onto vulnerable Windows PCs. Browsers are the primary target, but flaws in email clients, peer-to-peer networks, instant messaging clients, and media players can also be exploited in this way.

Browser beauty contest

Between July and December 2004 Symantec documented 13 vulnerabilities affecting Internet Explorer and 21 vulnerabilities affecting each of the Mozilla browsers. Six vulnerabilities were reported in Opera and none in Safari.

Of the 13 vulns affecting IE in 2H04, nine were classified as "high severity". Of the 21 vulnerabilities affecting the Mozilla browsers, Symantec classified 11 as "high severity". Firefox users enjoyed an easier ride with just seven affecting "high severity" vulns over the report period.

Symantec says there have been few attacks in the wild against Mozilla, Mozilla Firefox, Opera, or Safari, but the jury is still out on whether these browsers represent a more secure alternative to IE.

Nigel Beighton, Symantec’s director of enterprise strategy, EMEA, told El Reg that choice of browser is less important than activating seldom-used security zones features to limit exposure. "If you don't set trusted sites and stick by default browser security it's like surfing everywhere on the net with your wallet open," he said.

Attack, attack, attack

Symantec's Internet Threat Report, published Monday (21 March), brings together data gleaned from the security firm's SecurityFocus and managed security services division. The report found that financial service industry was the most frequently targeted sector in internet attacks, followed by hi-tech and pharmaceutical firms. "Attacks are becoming more targeted and specific," said Beighton.

For the third straight reporting period, the Microsoft SQL Server Resolution Service Stack Overflow Attack (formerly referred to as the Slammer Attack) was the most common attack, used by 22 per cent of all attackers. Organisations reported 13.6 attacks per day, up from 10.6 in the previous six months. The United States continues to be the top country of attack origin, followed by China and Germany.

Variants of NetSky, MyDoom, and Beagle, dominated the top ten malicious code samples in the second half of 2004. Symantec documented more than 7,360 new Win32 viruses and worms, 64 per cent up on the first half of the year. Two bots (malicious code that turns infected PCs into zombies under the command of hackers) were present in the top ten malicious code samples, compared to one in the previous reporting period. There were 21 known samples of malicious code for mobile applications, up from one in June 2004.

Symantec also noted a marked rise in email scams over second half of 2004. The firm's BrightMail anti-spam filters blocked an average of 33 million phishing emails a week in December 2004 compared to nine million a week in July 2004.

Symantec documented 1,403 new vulnerabilities in the second half of 2003, up 13 per cent from the first six months of last year. The vast majority (97 per cent) of the vulns recorded between July and December 2004 were either moderate or high risk.

In addition, over 70 per cent of these security flaws could be exploited using readily available tools or without the need for any attack code. The time between the disclosure of a vulnerability and the release of an associated exploit increased from 5.8 to 6.4 days.

Continuing a recent trend, web applications were a particular source of security problems. Almost half - 670 of 1,403 - of the security bugs logged by Symantec in 2H04 affected web applications. ®

Related stories

Britain tops zombie PC charts
Rise of the botnets
Mobile virus epidemics: don't panic
Windows XP users Phelled by new Trojan
Alternative browser spyware infects IE
The unsavoury world of PC licences and Firefox exploits

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