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Exfiltration av data 
Jonas Lejon 
Kryptera.se 
Internetdagarna 2014
Definition
Tidslinje 
OSINT Intrång/leverans C&C Kartläggning Exfiltration Upprensning 
X år
Skadlig kod 
• Axplock av skadlig kod: 
– Careto 
• Krypterade filer med .GIF 
– Flame 
• AutoCAD via SSH (puttys bibliotek) 
– FrameworkPOS 
• DNS 
– Duqu ”The mask” 
• Krypterade filer med JPG-filändelse
Flyga under radarn 
• Steganografi 
• Nyttja kända domäner/tjänster 
– Twitter, Dropbox 
• Installerade programvaror 
• Inga spår på hårddisk 
• Under lång tid 
• Flera destinationer 
• Kryptering 
• Modulärt
Flyga under radarn 
• Situation awareness 
– Airgap 
• Unikt för målsystemet 
– Sökväg till progamvara som invärde till 
nyckelderiveringsfunktion såsom scrypt 
– MAC 
• Tor Hidden Services 
– Meek transport (domain fronting) 
–
Detektion 
• Ändpunkter 
• Stora mängder ut/flöden 
– Argus 
• Minnesforensik 
• Loggning 
– Immunity El Jefe 
• IOC 
• Honeytokens 
• Spela in nätverkstrafik (FIFO)
Exempel 
Poison Ivy Metasploit
Poison Ivy C&C 
• Snort
Twitter: @kryptera 
https://kryptera.se 
https://triop.se

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Exfiltration av data (information)

  • 1. Exfiltration av data Jonas Lejon Kryptera.se Internetdagarna 2014
  • 3. Tidslinje OSINT Intrång/leverans C&C Kartläggning Exfiltration Upprensning X år
  • 4. Skadlig kod • Axplock av skadlig kod: – Careto • Krypterade filer med .GIF – Flame • AutoCAD via SSH (puttys bibliotek) – FrameworkPOS • DNS – Duqu ”The mask” • Krypterade filer med JPG-filändelse
  • 5. Flyga under radarn • Steganografi • Nyttja kända domäner/tjänster – Twitter, Dropbox • Installerade programvaror • Inga spår på hårddisk • Under lång tid • Flera destinationer • Kryptering • Modulärt
  • 6. Flyga under radarn • Situation awareness – Airgap • Unikt för målsystemet – Sökväg till progamvara som invärde till nyckelderiveringsfunktion såsom scrypt – MAC • Tor Hidden Services – Meek transport (domain fronting) –
  • 7. Detektion • Ändpunkter • Stora mängder ut/flöden – Argus • Minnesforensik • Loggning – Immunity El Jefe • IOC • Honeytokens • Spela in nätverkstrafik (FIFO)
  • 8. Exempel Poison Ivy Metasploit
  • 9. Poison Ivy C&C • Snort

Hinweis der Redaktion

  1. Ej insider, kan vara dock. Stadsunderstödda attacker med någon form av kod inblandad. Kvalificerade angrepp eller APT med mycket resurser i form av tid, kompetens, finansiering. Automatiserat
  2. OSINT= Open Source Intelligence. Insamling av information via öppna källor. Såsom whois, E-post, anställda och deras fritidsintressen och förehavanden på sociala medier Intrång/leverans= Utskick av .doc, USB-minne via E-post eller bakdörrad hårdvara. Ändra hårdvara in-transit hos FedEx/UPS etc C&C= Command and control, dvs kontrollkanal. Inte alltid nödvändig. Vet vi innan vad vi vill exfiltrera så kan vi hålla en lägre nivå Kartläggning= Var finns det vi är ute efter? Måste fler system komprometteras Exfiltration= Skicka ut dokument, källkod, privata nycklar eller annat som antagonisten är ute efter. Ändra/lägga till information Upprensning= Rensa spåren. Skriv aldrig till disk och nyttja helst redan befintliga komponenter i systemen
  3. Careto – Mot Spansktalande länder Flame - Mellanöstern