Aliases: TrojanDownloader.Win32.Small.pb, Downloader-KH trojan, TROJ_SYSGOTEM.A
It is a Trojan that executes the files System87.dll and System86.dll.
If the files do not exist, the Trojan downloads System86.dll from a preconfigured URL and executes it.
In order to run automatically each time Windows is started, the Trojan sets the following registry entry:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinInit = Win86.exe
Please, remove it with antivirus (also check How To Remove section)