Summarizing Zero Day's Posts for April

The following is a brief summary of all of my posts at ZDNet's Zero Day for April. You can also go through previous summaries for March, February, January, December, November, October, September, August and July, as well as subscribe to my personal RSS feed or Zero Day's main feed.

Notable articles include: Google's CAPTCHA experiment and the human factor; Conficker's estimated economic cost? $9.1 billion and Twitter hit by multiple variants of XSS worm.

01. Conficker worm's copycat Neeris spreading over IM
02. Paul McCartney's official site serving malware
03. Fake "Conficker Infection Alert" spam campaign circulating
04. Twitter hit by multiple variants of XSS worm
05. Scareware pops-up at FoxNews
06. Waledac botnet spamming fake SMS spying tool
07. Twitter worm author gets a job at exqSoft Solutions
08. Google's CAPTCHA experiment and the human factor
09. Hackers hijack DNS records of high profile New Zealand sites
10. New ransomware locks PCs, demands premium SMS for removal
11. Conficker's estimated economic cost? $9.1 billion
12. Swine flu email scams circulating
13. Online broker CommSec criticised for weak passwords, lack of SSL
14. Survey: 37% of employees would become insiders given the right incentive
15. French hacker gains access to Twitter's admin panel