Troj/FakeAV-AIA is a Trojan for the Windows platform.
When Troj/FakeAV-AIA is installed it creates the file <User>\Local Settings\Application Data\<random letters>\<random letters>sysguard.exe, and sets the following registry entry to run on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\<random letters>
<path listed above>
Registry entries are set as follows:
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
LowRiskFileTypes
.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
SaveZoneInformation
0x00000001
HKCU\Software\Microsoft\Internet Explorer\Download
RunInvalidSignatures
0x00000001
HKCU\Software\Microsoft\Internet Explorer\Download
CheckExeSignatures
no