putty.exe - false positive(?)

I have received a virus alert two times when launching this file (putty.exe).
Alert is: Backdoor.Win32.Blackhole.SJ@29503603

I have scanned it several times with online virus scanners (http://virusscan.jotti.org/ & http://www.virustotal.com/) and it comes up clean.
I’ve also submitted it to Comodo for analysis, and it came up clean there as well.
Comodo Support suggested that I made a post here if it showed up again.

Virus Signature Database Version 2158.
CIS Version: 3.11.108364.552
Realtime scanner is set to ‘Stateful’ and I haven’t been messing with the settings…

Attaching a screenshot of the alert.

(The program is not the standard PuTTY, it is PuTTY Tray from PuTTY Tray)

[attachment deleted by admin]

Hi hno,

Thank you for reporting false positive.
Your reporting is being verified.
we will get back to after investigation.

-Chandra Mohan