Technical Information
To ensure autorun and distribution
Creates or modifies the following files
- <SYSTEM32>\tasks\silll
Malicious functions
Patches code
in AMSI dll
- lbvcjtoi.exe process, Amsi.dll module
- silll.exe process, Amsi.dll module
in NTDLL dll
- lbvcjtoi.exe process, ntdll.dll module
- silll.exe process, ntdll.dll module
Modifies file system
Creates the following files
- %APPDATA%\silll.exe
- %TEMP%\tmp488e.tmp.bat
- %LOCALAPPDATA%\microsoft\clr_v4.0\usagelogs\<File name>.exe.log
- nul
Network activity
Connects to
- '<LOCALNET>..42.11':8808
- 'localhost':6606
- '<LOCALNET>..42.11':7707
- 'localhost':7707
Miscellaneous
Creates and executes the following
- '%APPDATA%\silll.exe'
Executes the following
- '<SYSTEM32>\cmd.exe' /c schtasks /create /f /sc onlogon /rl highest /tn "silll" /tr '"%APPDATA%\silll.exe"' & exit
- '<SYSTEM32>\cmd.exe' /c ""%TEMP%\tmp488E.tmp.bat""
- '<SYSTEM32>\timeout.exe' 3
- '<SYSTEM32>\schtasks.exe' /create /f /sc onlogon /rl highest /tn "silll" /tr '"%APPDATA%\silll.exe"'
- '<SYSTEM32>\cmd.exe' /c schtasks /create /f /sc onlogon /rl highest /tn "silll" /tr '"%APPDATA%\silll.exe"' & exit' (with hidden window)
