This just shows how stupid Xigncode is at this moment. Injection should raise a flag but not lead to an instant ban. You would need more intelligence to actually decide the red flag is actually a cheat or hack.
I guess Xigncode is not SD’s choice but rather Nexon’s, because if you read the company page of Xigncode’s creator wellbia I doubt they would be able to communicate in English very well (besides, I doubt someone from SD would have stumbled upon a random anti-cheat maker from South Korea):
Wellbia.com Co., Ltd is specialized protect information that purposed to trying to make 21 century’s Green computer environment that doing best to provide what customers need and be customers want via many experience and technology from this industry.
One of our result is making fair online game environment that developed an anti-hacking solution is call XIGNCODE3. It has been published and we have patent of “based on one-time excutable code structure” that using differentiated technology and manage. We choose to type of online game service companies’ management, and possible to integrate various levels of security policy on company who is being service.
You have our word Wellbia.com Co., Ltd tries to make Green computer environment, vender provides safe and convenient service, and end user uses your service as feel relieved.
Wellbia.com Co., Ltd will do our best for safe and convenient information service that integrated our solution in the word.
Thank you.
Their company page is even more complete with a quote of Ghandi: “Speed is irrelevant if you are going in the wrong direction. - Mahatma Gandhi”. This company is enlightened! 
(on a side note, having studied in Japan and probably returning there this year, I have a lot of respect for people from Eastern countries which try to speak a language which feels as foreign to them as languages like Japanese, Korean and Chinese feel for us)