Well as you mentioned before MBAM found nothing.
The aswMBR.exe is reporting an Unknown MBR code (e.g. not the default MBR code), this can indicate the presence of an MBR rootkit, but it can also mean nothing more than you have a customised system, like a Dell, HP, etc. These may have a custom MBR to allow for use of their recovery partition, to restore your system back to the factory settings. Is your system from a major computer manufacturer like Dell, HP ?
The tdsskiller is also looking for rootkits, specifically TDSS variants, I assume it didn't find anything ?
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The OTL logs will have to be analysed by a specialist, when he is on-line.