This has been discussed at my site. If you downloaded it from my site then it's a false positive. That detection has only started a few weeks ago, the program was compiled nearly 8 months ago.
I'm not sure where it comes from though. I think it has to do with the "fake" versions that are circulation which do have a trojan attached (like the so called beta 3). Either that or the AV program sees the login functionality as dangerous. Whatever the case it's a false positive and if i were to simply recompile beta 2 without changes the warning would disappear.
If you don't trust it don't use it. The program is not packed so anyone can inspect it with Reflector which will prove there is no virus in there.
See:
http://code-projects.com/forum/topic/374-sharpleech-beta-#2/page__st__160__p__23210&#entry23210
"official" download link:
http://code-projects.com/forum/topic/374-sharpleech-beta-#2/