A common pattern we see in compromised websites is the presence of backdoors and other malicious code.  During Q3 of 2016, we found that 72% of all compromises that we encountered had a PHP-based backdoor hidden within the site. Attackers experiment with various techniques and types of malware to abuse server resources and distribute spam while maintaining access to the site for as long as possible.

In the case of automated attacks, sometimes we’re lucky enough to see hackers access the same website and step on each other’s toes.

Continue reading vBulletin Malware – When Hackers Compete for Backdoor Control at Sucuri Blog.

Via Sucuri.net