: Delete DRBGuestbook immediately. Run a full malware scan. Update your CMS and all plugins. Change all credentials.
: Use a database management tool (like phpMyAdmin) to search for the string "Direktvertrieb Kasin" and remove it from your posts or comments. Update Passwords Powered By Drbguestbook 28 Direktvertrieb Kasin
If you are the victim (the site "powering" this link), you are not liable, but your reputation suffers. If you are the promoter injecting these links, you are violating: : Delete DRBGuestbook immediately
For more information on general web security and protecting your keys, you can visit the SmartCard-HSM site spam filters Change all credentials
The best defense is staying current. Security is a moving target, and "set it and forget it" is no longer a viable strategy for the modern web.
If you have run a backlink audit, scanned your server logs, or found this text hidden in the footer of a compromised website, you are likely dealing with the aftermath of an automated spam injection or a defaced page footer.
However, the internet of the 1990s and early 2000s was a very different environment. Security was often an afterthought, and the mechanisms to prevent spam were primitive. "Powered by" footers were originally intended as a credit to the software developer—a hyperlink back to the creator’s site.