Technical Information
Triggers a user-defined sigma rule:
- c3dbbc9f-ef1d-470a-a90a-d343448d5875
- 20f0ee37-5942-4e45-b7d5-c5b5db9df5cd
To ensure autorun and distribution
Modifies the following registry keys
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'WindowsSystemMonitor' = '"%LOCALAPPDATA%\Low\Microsoft\CryptnetUrlCache\UpdateService.exe"'
Modifies file system
Creates the following files
- %LOCALAPPDATA%\low\microsoft\cryptneturlcache\updateservice.exe
Sets the 'hidden' attribute to the following files
- %LOCALAPPDATA%\low\microsoft\cryptneturlcache\updateservice.exe
Deletes itself.
Network activity
Connects to
- 'ap#.##legram.org':443
UDP
- DNS ASK ap#.##legram.org
Miscellaneous
Creates and executes the following
- '%LOCALAPPDATA%\low\microsoft\cryptneturlcache\updateservice.exe' --monitor
Executes the following
- '%LOCALAPPDATA%\low\microsoft\cryptneturlcache\updateservice.exe' --monitor' (with hidden window)
