The problem you describe is challenging and worthy of your concern. It's important for most of us to respect and like the people with whom we work every day. This is not to say that you must get along with everyone in your office or develop close personal relationships with co-workers. But, if your core values are compromised or threatened, you won't fare well in this environment.
If on reflection you think you may have misjudged the seriousness of your situation, take more time to gather information on how this office operates. Keep notes of your observations so you'll have documented proof of the actions of others, including any misconduct. Of course, if asked during this time to do something that violates your values, you'll have to refuse and the situation will probably come to a head.
Your feelings, on the other hand, are subjective and don't lend themselves to any kind of an empirical test. You might want to consider whether this transition has made you less open-minded and quicker to judge others. Try to find common ground with at least one or two co-workers and get to know them better. This might help you revise your initial impressions.
But suppose that after trying these suggestions you aren't wrong and your office does operate with less integrity than you can tolerate, you likely won't be able to change much and may need to leave. You can try to transfer back to your old job by citing a mismatch or personal reasons. We don't think this should put a black mark on your record as it's common in today's ever-changing job market. This solution will preserve your salary and resolve the situation without rancor. If this isn't an option, you should quietly and discreetly begin a new job search while still employed.