In DOS days AVG's heuristic detection engine had flag for programs that did write into their own binary (it was reported as +i AFAIK), but it didn't have much w

In DOS days AVG's heuristic detection engine had flag for programs that did write into their own binary (it was reported as +i AFAIK), but it didn't have much weight as essentially anything compiled with Borland Pascal was flagged in this way (IIRC including AVG itself).