Protection Against Malware. Alan German Ottawa PC Users Group

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1 Protection Against Malware Alan German Ottawa PC Users Group

2 Minimum Requirements (1) Up-to-date anti-virus and anti-spyware software (2) Software firewall (3) Fully-patched operating system (Windows Update)

3 Enhanced Security (4) Secondary one-time virus scanner (system and/or individual file) (5) Two-way firewall (6) Fewer clicks (You don t have to click on everything!)

4 Malware Virus spreads from one file to another Worm spreads from one computer to another Trojan does some malicious action but does not spread itself. Fake anti-virus Ransomware

5 Infection Methods Web links/file downloads attachments Removable media (e.g. USB memory sticks) Macros in documents Networks

6 Harmful Effects Delete files Encrypt files (ransomware) Steal userids/passwords (banking!) Install a backdoor (zombie computer spam botnet DoS attacks)

7 System Security Status

8

9

10

11

12

13 Virus Scanning Real-time scanning Check as any file is read from the disk or is written to the disk On-demand (scheduled) scanning Checks the entire disk when requested Memory scanning Some worms are never written to disk (e.g. SQL Slammer)

14 Signature vs. heuristics Virus Signatures Looks for exact byte patterns Can have false positives (rare) Heuristics Looks for virus-like activity (e.g. overwrite a Windows\System32 file) Can catch some unknown malware

15 Anti-Virus Implications (1) Conduct an on-demand scan of the (1) entire computer (2) Ensure that the system is clean (2) (all current files are virus free) (3) Set on-access scanning (2) (any new file written to disk is checked) (3)

16 Anti-Virus Implications (1) Conduct an on-demand scan of the (1) entire computer (2) Ensure that the system is clean (2) (all current files are virus free) (3) Set on-access scanning (2) (any new file written to disk is checked) (3) The computer stays clean!

17 Anti-Virus/Anti-Spyware Windows Defender

18 Anti-Virus/Anti-Spyware

19

20

21

22 More Periodic Checks? It doesn t hurt to do an on-demand scan now and then (particularly overnight) Set-it and Forget-it It s not a bad idea to use a different antivirus program occasionally Free download restricted features

23 10 Immutable Laws of Security Law #8: An out of date virus scanner is only marginally better than no virus scanner at all

24 More Protection Always show file extensions Beware of double-file extensions! NicePhoto

25 More Protection Always show file extensions Beware of double-file extensions! NicePhoto.JPG.EXE is a program not an image file

26 More Protection Always show file extensions Beware of double-file extensions! NicePhoto.JPG.EXE is a program not an image file File Explorer - View - Check File name extensions

27 More Protection Use a different PDF reader PDF-XChange Viewer

28 One-Time Scan

29 Just Don t Click! "This site may harm your computer" Reputation icons

30 Just Don t Click! "This site may harm your computer" Reputation icons

31 Just Don t Click! Web of Trust Browser add-in Crowd-sourced protection

32

33

34 Just Don t Click!

35 Spam Recognition Guide (Boolean NOT filter) Message Subject Re: Dont ignore this notice Account compromised let us save you money NOT filter output Not a reply Ignore this notice Your account is just fine Let us steal your money There's only one spam message with a subject that will fail the Boolean NOT test and it s fairly easy to spot...???

36 There's only one spam message with a subject that will fail the Boolean NOT test and it s fairly easy to spot...

37 There's only one spam message with a subject that will fail the Boolean NOT test and it s fairly easy to spot... Spam

38 Firewall Standard Firewall Allows connections from your computer You can connect to the Internet (e.g. web server, mail server) Data can flow back to you because you initiated the (trusted) connection Blocks other connections to your computer

39 Two-Way Firewall Standard operation Allows (trusted) connections from your computer Blocks connections to your computer Enhanced operation Can block untrusted connections from your computer (Stop malware dialing home!)

40 Zone Alarm

41 No Free Lunch?

42 No Free Lunch?

43 Use Caution with Freeware!

44 Use Caution with Freeware! What else am I getting?

45 Custom Install Can leave blank or use throw-away address

46

47 New Connection Remember this setting Allow permanently Deny permanently Uncheck this box One-time authorization See what happens!

48 Tools Menu

49 Application Control

50 View Programs

51 Modify Individual Entries

52 Update vs. Upgrade? Update Obtain security patches Upgrade Pay for pro version! Nagware? TBD!

53 Windows Update

54

55

56

57

58 Patches for Applications

59

60 Can be overly protective? Run-time version installed by Taxman

61 Can be overly protective?

62 Regular Checks System security status (Control Panel) Anti-Virus, Firewall, UAC Internet security, SmartScreen Windows is fully patched (Windows Update) Applications are up to date (Secunia PSI) System is virus free (Malwarebytes)

63 Good To Go!

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