can someone explain this?

04/04/2009 22:22 aaaaaa422#1
Latest SBot-Version: v1.15
Release Date: 31.03.2009

and i scan it 1.04.2009 @ virustotal and it was:

File has already been analysed:
MD5: 5050acab4e90acf715afdbc2ef620db2
First received: 04.03.2009 14:49:24 (CET)
Date: 01.04.2009 19:54:07 (CET) [<1D]
Results: 0/38
I scanned "SBot_1.15.rar"
What i trying to find out?

1.Look @ date when it was first time scanned 4.3 and look (31.03)when it was released @ sbot site (little wierd)

2.Scan was 0/38 i scan it before 3 days and now its 1/38

I dont want any sbot support noobs in this thread!