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Malware by Ms. Allwood
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- 2. OBJECTIVES  What malwareare  Types of malware  How do they infect hosts  How do they hide  How to detect them
- 3. WHAT IS AMALWARE ? A Malware is a set of instructions that run on your computer and make your system do something that an attacker wants it to do.
- 4. WHAT IT ISGOOD FOR ?  Steal personal information  Steal valuable data  Destroy data  Denial of Service  Use your computer as relay
- 5. VIRUSES  A maliciouspiece of code that spreads itself from file to file  A virus needs a host file  Requires user interaction  Like opening a file  Different types of viruses  Program viruses  Boot viruses  Macro viruses Infected File Virus as payload
- 6. WORMS  A maliciouspiece of code that spreads itself from computer to computer by exploiting vulnerabilities  A worm needs no host file  Spreads without user interaction  Can spread via  e-mail attachments  LAN or Internet  2nd generation of worms automatically search for vulnerable computers and infect them  Whole Internet can be infected in less than 20 minutes
- 7. TROJANS  “Trojan Horse” Programs with hidden malicious functionalities  Appear to be screen savers, games, or other “useful” programs  “There’s an app for that!”  IPhone and Android apps
- 8. LOGICAL BOMBS  Maliciouscode programmed to be activated on a specific date, time or circumstances  Action could be everything from formatting hard drive to display a silly message on the user’s screen  Often combined with a virus/worm (e.g, Chernobyl virus)
- 9. BLENDED THREATS  Advancedmalicious software that combines the characteristics of viruses, worms, trojans and malicious scripts are sometimes called “Blended Threats”  It’s hard to know where to draw the line  Exploits one or many vulnerabilities in programs or operating system *Mick Douglas, PaulDotCom Podcast https://twitter.com/#!/haxorthematrix/statuses/242108
- 10. VIRUSES  4 phases: Dormant phase: It is idle, waiting for some event  Triggering phase: activated to perform some intended actions  Propagation phase: Copy itself into other programs  Execution phase: execute the payload
- 11. MACRO VIRUSES  Macro:an executable program embedded in a document to automate repetitive tasks. (save keystrokes)  Application-dependent, e.g., MS office  Cross the O.S. platform  Why virus writers like macro viruses?  Easy to learn  Easy to write  Popularity of MS office
- 12. HOW MACRO VIRUSWORKS  Every word document is based on a template  When an existing or new document is opened, the template setting are applied first  A global template: NORMAL.DOT
- 13. WORM  Worm: self-replicatingover networks, but not infecting program and files  Example: Morris worm, blaster worm
- 14. THE STRUCTURE OFWORMS  Target locator (find the target)  Email address collector  IP/port scanner  Warhead  Break into remote machines  Propagation  Automatically sending emails  Automatically attack remote hosts  Remote control and update  Download updates from a web server  Join a IRC channel  Lifecycle management  Commit suicide  Avoid repeatedly infecting the same host  Payload
- 15. STATE OF WORMTECHNOLOGY  Multiplatform: Windows, unix, mac, …  Multiexploit: web server, browser, email,…  Ultrafast spreading: host/port scanning  Polymorphic: Each copy has new code generated by equivalent instructions and encryption techniques.  Metamorphic: different behavior patterns  Transport vehicles: for the payloads (spread attacking tools and zombies)  Zero-day exploit: self-updated
- 16. DISCUSSION  Is ita good idea to spread worms with system patches?
- 17. TROJAN  A programwith hidden side-effects that are not specified in the program documentation and are not intended by the user executing the program
- 18. WHAT A TROJANCAN DO  Remote administration trojans: attackers get the complete control of a PC  Backdoor: steal data and files  Distributed attacks: zombie network  Password stealers: capture stored passwords  Audio, video capturing: control devices  Keyloggers: capture inputting passwords  Adware: popup advertisements  Logic bomb: only executed when a specific trigger condition is met
- 19. FAMILIAR WITH YOURPC  Startup programs/services  Frequently used IP ports 20/21 FTP 23 Telnet 25 SMTP 80 WWW  Netstat
- 20. MALWARE PAYLOADS  Nopayload  Payload without damage Only display some information  Payload with little impact Modify documents (wazzu virus)  Payload with heavy impact Remove files, format storage Encrypting data (blackmail) Destroy hardware (W95.CIH): rewrite flash bios  DDoS attacks  Steal data for profit
- 21. MALWARE NAMING  CARO(computer antivirus researchers organization)  CARO naming convention (1991)  <family_name>.<group_name>.<Infective_length >.<variant>.<modifier>  e.g., cascade.1701.A.  Platform prefix  win32.nimda.A@mm
- 22. MALWARE DEFENSES (1) Detection: once the infection has occurred, determine that it has occurred and locate the virus  Identification: once detection has been achieved, identify the specific virus that has infected a program  Removal: once the specific virus has been identified, remove the virus from the infected program and restore it to its original state
- 23. MALWARE DEFENSES (2) The first generation scanner Virus signature (bit pattern) Maintains a record of the length of programs  The second generation scanner Looks for fragments of code (neglect unnecessary code) Checksum of files (integrity checking)  Virus-specific detection algorithm Deciphering (W95.Mad, xor encrypting) Filtering
- 24. MALWARE DEFENSES (3) The third generation scanner  Identify a virus by its actions  The fourth generation scanner  Include a variety of anti-virus techniques  Collection method  Using honeypots
- 25. MALWARE IN MOBILEPHONES  Mobile phones are computers with great connectivity  Internet  WLAN  Bluetooth  Regular phone network (SMS, MMS)  RFID
- 26. IN THE FUTURE… New spreading methods: e.g., RFID Infected! Infected! Infected!
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