An Australian company MD Webhosting has admitted being a victim to a similar hacking incident that resulted in hidden links being inserted into clients' sites to the one we reported earlier this month.

The ISP has admitted that their security was not up to scratch and that not all their customers were affected. If it is like the hacking we have been tracking, then only those customers with a high Google PageRank will have been targeted.

Although the compromise doesn't have the same visibility as stealing credit card data, the effect on a company's business that relies on organic search engine traffic can be dramatic, as they become innocent victims to bad-neighbourhood algorithm checks.