My Oracle DB is destroyed including backups (ransomware). I have a dump file 11GB in size. Exported by EXP with parameters FULL=Y. First objects in dump belong to SYSTEM USER. The dump is encrypted but only first 256kb, there is no sign of encryption in dump beyond this limit.
I have made an statistical analysis and there is no entropy spikes in entire file except the header. When I open the dump file in hex editor, i can see the data. I know my ERP and I can recognize tables rows and data.
How to extract the data, how to force extract table data?