MalformedEnlistmentException in BizTalk

You were hacked

Does anyone have any idea why this error can happpen. We didn’t do any enlistment when the error happened. The orchestration instance got suspended and we resumed it and everything became ok.
thanks You!

Exception type: TypeInitializationException
Source: mscorlib
Target Site: Void RunClassConstructor(System.RuntimeTypeHandle)
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Additional error information:

Exception of type MalformedEnlistmentException was thrown.

Exception type: MalformedEnlistmentException
Source: Microsoft.XLANGs.BizTalk.Engine
Target Site: Microsoft.BizTalk.XLANGs.BTXEngine.BTXServiceStaticState _deserializeStaticState(System.Guid)

Hacked Again