Malwarebyte installer is trojan ?

Could very well be - my suggestion is to post this information in the Kaspersky forums.

Have you ever had a malware infection on this PC before?

Hi,

Looking back through some of your other threads, I can't help but conclude you have had a troubled system - many threads seem to be unresolved. I wonder if there are still remnants of previous anti-malware products on you system, or even undetected malware.

My suggestion is to stop experimenting with all these suites. Turn off the resident kaspersky (do you have others installed?) and run a scan using ESET on-line scanner, and post the results back here:

ESET :: Get a FREE Online Virus Scan

My gut instinct is your current issue is a not obvious? browser re-direction, or an existing infection playing havoc with your system.

Regards,
Golden

I noticed that when I was testing VTChromizer the other day. I got exactly the same results for the latest Malwarebytes. I assumed it a false positive.

The Free link redirects to CNET and has for the past few months.

Hi,

I recommend running the ESET on-line scanner - lets take it from there.

Regards,
Golden

@DarSlay3r
Regarding MBAM setup and the Kaspersky "quarantine" of it:
You had a Fasle positive from Kaspersky.
Miekiemoes says

Kaspersky already fixed this False Positive, so it won't be detected anymore in a next definitions update.

ref Trojan FP? - Malwarebytes Forum

Good luck on the rest.

DarkSlay3r said:

Nope,while kaspersky installing,it auto removed malwarebyte.And I removed NOD32 in safe mode,thus I'm sure there is no other AV.

What I wondering is how does a hacker got into my yahoo mail and hotmail without any malicious code spyware and keylogger etc to steal password from me,it doesn't make sense.After I realized and I run full scan,found only is the malwarebyte installer.

Furthermore,I checked yahoo notification,it writes an unknown access from other region into account only today and the trojan I found also today.If it's a false positive from kaspersky,what would the thing causes my information been stole ?

@Darkslay3r
Email accounts can be hacked & are all the time, and yahoo & hotmail are quite popular targets.
Did you cure your hacked accounts? ie, report them AND change your password?

Seems to me you need to do a full set of checks for viruses and malware.
{Your Kaspersky gave you a false positive, as noted elsewhere).

On some regular schedule, it is a good idea to do an online scan for viruses and malware. Here is a very short list of sites where this may be done:
ESET Online Scanner
Panda ActiveScan
Trend Micro Housecall
F-Secure Online Scanner