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Indagini Digitali: Linux e l'Analisi Forense

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Indagini Digitali: Linux e l'Analisi Forense

  1. 1.       Indagini Digitali: Linux e l'Analisi Forense Gianni Amato   LinuxDay 2008 Reggio Calabria http://www.cfitaly.net 1 Gianni Amato ­ LinuxDay08
  2. 2. CFI – Computer Forensics Italia Mailing list (..almeno finora)  Si analizzano insieme i casi reali  E' ispirata alla filosofia dell’Open Source  Documentazione e sviluppo di forensics tools  Corsi, convegni, rappresentanze  Game  http://www.cfitaly.net 2 Gianni Amato ­ LinuxDay08
  3. 3. Security && Forensics Prepara Investiga   Previene Analizza   Riduce Recupera   http://www.cfitaly.net 3 Gianni Amato ­ LinuxDay08
  4. 4. Security && Forensics Incidente Reazione Ripristino http://www.cfitaly.net 4 Gianni Amato ­ LinuxDay08
  5. 5. Computer Forensics La disciplina che si occupa dell’identificazione, dello studio  e della preservazione dei dati presenti su un computer al  fine di evidenziare prove di reati informatici. Quindi per le indagini giudiziarie (...e non solo). Il computer come fonte di prova. http://www.cfitaly.net 5 Gianni Amato ­ LinuxDay08
  6. 6. E' compito dell'Esaminatore Forense  Studiare e ricostruire la scena del crimine informatico   Analizzare le evidenze informatiche mediante   metodologie scientifiche  Presentare i risultati  Qundi: fornire risultanze che abbiano un valore legale e garantire che nulla  abbia subito alterazioni in fase di analisi. http://www.cfitaly.net 6 Gianni Amato ­ LinuxDay08
  7. 7. Perchè Linux?  E' open source e questo comporta notevoli vantaggi:    il sorgente è visionabile da chiunque.   lunga vita alle vecchie versioni (facilmente reperibili).  Linux supporta una enorme quantità di filesystem diversi.   Linux dispone di numerosi tools per la forensics.   Linux permette di montare le unità e i supporti removibili in   modalità solo lettura (read­only).  ...Bash è poesia.  http://www.cfitaly.net 7 Gianni Amato ­ LinuxDay08
  8. 8. Device hd = IDE sd = SCSI sda = 1° disco sdb = 2° disco sda1 = prima partizione logica del primo disco sda2 = seconda partizione logica del primo disco http://www.cfitaly.net 8 Gianni Amato ­ LinuxDay08
  9. 9. La Copia Forense Non agire mai sul supporto originale Clonazione  File immagine  esempi dd # dd if /dev/hda of=/mnt/disk/immagine.dd bs 512 count=noerror sync # dd if /dev/hda | nc 10.0.0.1 1234 # dd if=/dev/zero of=/dev/hda http://www.cfitaly.net 9 Gianni Amato ­ LinuxDay08
  10. 10. Validazione Confronto della copia con l'originale L'Algoritmo di Hashing. Esiste ed è unico! # md5sum /dev/hda # sha1 /dev/hda # md5sum  /mnt/disk/immagine.dd # sha1 /mnt/disk/immagine.dd Hash collision? http://www.cfitaly.net 10 Gianni Amato ­ LinuxDay08
  11. 11. Analisi Analisi Live   Live CD device, ram, processi, history  Analisi Post­Mortem   Copia forense file, logs, images, registry  http://www.cfitaly.net 11 Gianni Amato ­ LinuxDay08
  12. 12. Alcune metodologie Contatti e conversazioni chat  Timeline activity  Carving (filetype / header)  Caratteristiche del filesystem  Cronologia e siti preferiti  Registry Review  Recupero file eliminati   Metadata e Active Data Stream File temporanei   Corrispondenza elettronica  Ricerca delle keywords  Ricerca immagini  http://www.cfitaly.net 12 Gianni Amato ­ LinuxDay08
  13. 13. Analisi protocolli Wireshark • cattura • filtra • ordina • analizza (libpcap) http://www.cfitaly.net 13 Gianni Amato ­ LinuxDay08
  14. 14. L'Autopsia Wikipedia: L'autopsia, chiamato anche esame post­mortem, è un esame medico  dettagliato ed attento del corpo e dei relativi organi della persona dopo la morte  per stabilirne le cause, le modalità ed eventualmente i mezzi che l'hanno prodotta ...l'autopsia di un disco non è poi così diversa da quella di un corpo umano http://www.cfitaly.net 14 Gianni Amato ­ LinuxDay08
  15. 15. Recupero dei dati Quando è possibile? http://www.cfitaly.net 15 Gianni Amato ­ LinuxDay08
  16. 16. Carving <header> ... ... ... </footer> http://www.cfitaly.net 16 Gianni Amato ­ LinuxDay08
  17. 17. Trova le differenze http://www.cfitaly.net 17 Gianni Amato ­ LinuxDay08
  18. 18. Risalire alla foto originale EXIF && THUMBNAIL http://www.cfitaly.net 18 Gianni Amato ­ LinuxDay08
  19. 19. Domande ? http://www.cfitaly.net 19 Gianni Amato ­ LinuxDay08
  20. 20. Info && Contatti Gianni Amato Web: http://www.gianniamato.it http://www.securityside.it E­mail:  gianni.amato@gmail.com  amato@securityside.it Cell: +39 320 28 42 382 http://www.cfitaly.net 20 Gianni Amato ­ LinuxDay08

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