Yes I do believe they are checking some log or files before it loads and you are banned because i cleaned the files and then it was detected even with encrypting it i've been reading just encrypted the dll "http://www.mpgh.net/forum/197-combat-arms-discussions/492014-nexon-combat-arms-8-4-2012-a.html" here at this discussion and you should be fine nope dont work trust me i did it.
Thanks for the reply tho hopefully soon we will have this figured out