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Now.... 10 days ago ALL index files on the site had a malicious iframe injection/hack. The injctions lasted for a few hours the first day and then continued at 24 hour intervalls for 2 days (1 hour each time) until we beleive we managed to stop the intrusions.
Just recently ALL SERPS for all domains got tanked to position #100-350 (with the exception of one less competitive keyword still at #1... weired). Site still at PR5.
Importantly, we can see that Google has cached our indexpage JUST at the time of the hack, we therefore suspect the hack to have been the cause of the sudden drop across the domains.
Question: What time frame to expect for a penalty of this kind? Should we contact contact Google mnanually in this matter. Other tips?
Our SEO efforts are very conservative, and I don't feel we have anything to hide, but these days even a couple of social bookmarks on multiple blog posts seem to hold the potential for triggering severe penalties (we don't buy links etc.)
Soxox's advice seems like a safer way to travel.