Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKCU>\software\Microsoft\Windows\CurrentVersion\Run] '6287c14db4578a7c43a872cb541be4ab' = '"%TEMP%\csrss.exe" ..'
- [<HKLM>\software\Microsoft\Windows\CurrentVersion\Run] '6287c14db4578a7c43a872cb541be4ab' = '"%TEMP%\csrss.exe" ..'
Creates or modifies the following files
- %HOMEPATH%\start menu\programs\startup\6287c14db4578a7c43a872cb541be4ab.exe
Creates the following files on removable media
- <Drive name for removable media>:\6287c14db4578a7c43a872cb541be4ab.exe
- <Drive name for removable media>:\autorun.inf
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:
- hidden files
Executes the following
- '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE
Modifies file system
Creates the following files
- %TEMP%\csrss.exe
Sets the 'hidden' attribute to the following files
- <Drive name for removable media>:\6287c14db4578a7c43a872cb541be4ab.exe
- <Drive name for removable media>:\autorun.inf
- %TEMP%\csrss.exe
- %HOMEPATH%\start menu\programs\startup\6287c14db4578a7c43a872cb541be4ab.exe
Network activity
UDP
- DNS ASK 0.###.ngrok.io
Miscellaneous
Creates and executes the following
- '%TEMP%\csrss.exe'
- '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE' (with hidden window)
