Win32.HLLW.Autoruner2.52561

To ensure autorun and distribution

Modifies the following registry keys

[<HKCU>\software\Microsoft\Windows\CurrentVersion\Run] '812f3ff4423794267dbe4716fd18a376' = '"%TEMP%\csrss.exe" ..'
[<HKLM>\software\Microsoft\Windows\CurrentVersion\Run] '812f3ff4423794267dbe4716fd18a376' = '"%TEMP%\csrss.exe" ..'

Creates or modifies the following files

Creates the following files on removable media

Malicious functions

To bypass firewall, removes or modifies the following registry keys

[<HKLM>\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\csrss.exe' = '%TEMP%\csrss.exe:*:Enabled:csrss.exe'

To complicate detection of its presence in the operating system,

forces the system hide from view:

Executes the following

'<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE

Modifies file system

Creates the following files

Sets the 'hidden' attribute to the following files

Network activity

Connects to

UDP

Miscellaneous

Creates and executes the following

'%TEMP%\csrss.exe'
'<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE' (with hidden window)