IsoBuster is virus free. Always has been. Not ever once compromised. That doesn't mean there aren't false positives from time to time, but that is hardly the developer's fault. Blame AVG companies.
FYI: https://www.virustotal.com/en/file/afa06424b2a1873ae8f9a0f641da90ee0c0b7de2f15b7798a23feaaf740ceaa7/analysis/