A moment ago I got this:
8/9/2012 09:20:40 (EDT) Encountered and terminated IRCBot.wln in C:\cygwin\bin\sync.exe!
This file is the sync command from GNU (coreutils) and is used by Cygwin as such. I verified that the executable had not been modified from that in the Cygwin coreutils-8.15.1-1.tar.bz distribution. (I extracted it again and compared the two executables.) The MD5 checksum of the archive was also correct.
How exactly does the heuristic conclude that this is IRCbot.wln?