I will tell you in this post how to fix the issue manually and how to clean it automatically using a special powerful removal tool. You can download the removal program for free here:

Malware: C:\sand-box\1.exe

Removed: C:\WINDOWS\system32\wbem\grpconv.exe

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Detected by UnHackMe:

Item Name: wpv671289563543.exe
Author: Unknown
Related File: C:\WINDOWS\TEMP\WPV671289563543.EXE – random filename
Type: Running Processes

After first reboot detected by UnHackMe:

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Item Name: userini
Author: Unknown
Related File: C:\WINDOWS\EXPLORER.EXE:USERINI.EXE
Type: Explorer Run

Item Name: wpv181289563741.exe
Author: Unknown
Related File: C:\WINDOWS\TEMP\WPV181289563741.EXE – random filename
Type: Running Processes

Detected manualy:

GRPCONV.EXE
Default location: C:\WINDOWS\system32\wbem\grpconv.exe
MD5: EE60216F856BC9CB2DC601A080859C96
SHA1: 59AE8E08 EDD18ABA A612373E 2A6450E0 EADE9E45
File Size: 29 184

Removal Results: Success
Number of reboot: 2

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How to quickly detect malware presence?

Registry: HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\RunGrpConv
Value: 0×00000001

Files:
C:\WINDOWS\system32\wbem\grpconv.exe
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Classification:

Antivirus	Version	Last Update	Result
F-Secure	9.0.16160.0	2010.11.13	Trojan.Generic.KD.64227
Kaspersky	7.0.0.125	2010.11.13	-
Microsoft	1.6301	2010.11.13	-
NOD32	5616	2010.11.13	-

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MD5 ee60216f856bc9cb2dc601a080859c96

SHA1 59ae8e08edd18abaa612373e2a6450e0eade9e45

SHA256 0f3e70f521ec70be1a337f0156609a5b51bcc1abb14564bfd0546a05a7198241

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Installation
When the program is executed, it creates the following registry subkeys and values:

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Values added:1
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HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\RunGrpConv: 0×00000001

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Files added:3
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C:\Documents and Settings\Administrator\Application Data\wiaservg.log
C:\Documents and Settings\Administrator\Local Settings\Temp\~TM4.tmp
C:\WINDOWS\system32\wbem\grpconv.exe

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Files deleted:2
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C:\sand-box\1.exe
C:\WINDOWS\system32\grpconv.exe

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Total changes:6
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Recommended software:
UnHackMe anti-rootkit and anti-malware
http://www.unhackme.com
RegRun Security Suite (Good choice for removal and protection)
http://www.regrun.com

I use UnHackMe for cleaning ads and viruses from my friend's computers, because it is extremely fast and effective.

STEP 1: Download UnHackMe for free

UnHackMe removes Adware/Spyware/Unwanted Programs/Browser Hijackers/Search Redirectors from your PC easily.

UnHackMe is compatible with most antivirus software.
UnHackMe is 100% CLEAN, which means it does not contain any form of malware, including adware, spyware, viruses, trojans and backdoors. VirusTotal (0/56).
System Requirements: Windows 2000-Windows 8.1/10 32 or 64-bit. UnHackMe uses minimum of computer resources.