Activists are targetting using the Anonymous attack tool, known as LOIC. When a person installs the tool on their PC it enrols the machine into a voluntary botnet which then bombards target sites with data.
Once downloaded, LOIC would enabled computers to join the co-ordinated attacks against websites perceived to be "anti-Wikileaks" and is now reported to have been downloaded more than 31,000 times.
However, security experts warned people to avoid joining the voluntary botnet.
These distributed denial-of-service (DDoS) attacks are illegal in many countries.
Social network Facebook confirmed that it had removed Operation Payback - as the campaign is known - from the site because it was promoting its attack tool.
Earlier attacks against Visa and Mastercard knocked the official websites of the two offline for a while and resulted in problems for some credit card holders.
Defending against an attack typically involves analysis to work out which ones are being employed. A tactic that may not work well in this case.
As well as releasing the attack tool, the Anonymous group has also been active in helping to create mirror sites. To date there are over one thousand sites offering exact copies of the content on Wikileaks.
It is also ensuring the information is available on dark nets, heavily encrypted layers of the internet via which information can be extracted while remaining untraceable.
via Reuters