lesson 7 preparing for incident response and the investigative process
TRANSCRIPT
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Lesson 7Preparing for Incident Response
and the Investigative Process
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UTSA IS 6353 Incident Response
Overview
• Preparing for Incident Response
• Investigative Guidelines
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UTSA IS 6353 Incident Response
Ranum on Forensics
• “The real value of intrusion detection is diagnosing what is going on…never collect more data than you could conceivably want to look at. If you don’t know what to do with the data, it doesn’t matter how much you’ve got.”
Marcus Ranum
Network Flight Recorder
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Preparing for Incident Response
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UTSA IS 6353 Incident Response
Identify Vital Assets
• What can damage your organization the most?• What concerns you?• Who could be a threat?• Do hackers concern you?
This step saves you time & $ later
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UTSA IS 6353 Incident Response
Applicable Security Maxims
• Ignorance is Bliss Maxim: The confidence that people have in • security is inversely proportional to how much they know about it.
• Ass Sets Maxim: Most security programs focus on protecting the wrong assets.
• Takes One to Know One Maxim: The fourth most common excuse for not fixing security vulnerabilities is that “our adversaries are too stupid and/or unresourceful to figure that out.”
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UTSA IS 6353 Incident Response
Preparing Systems
• Record cryptographic checksums of critical files (MD5)– Tripwire is widely accepted commercial product
• Increase or enable secure audit logging• Build up your host’s defenses• Backup critical data and store media securely• Educate users about security
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UTSA IS 6353 Incident Response
Critical File Preparation
• Cryptographic checksums or Message Digest (MD)– Basically a digital signature
• MD5 creates a 128-bit checksum from a large file• System Administrator can create checksum of
critical file (use separate media) then compare against subsequent MD5 runs
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UTSA IS 6353 Incident Response
Unix Auditing
Turn on system logging– /var/log/syslog– Create Central Syslog server
• run syslogd -r
– Enable Process Accounting• Tracks the command each user executes
– accton command– /usr/lib/acct/startup
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UTSA IS 6353 Incident Response
Windows Auditing
• By default security auditing is not enabled• NT: Start|Programs|Administrative Tools| User
Manager– User Manager select Policies|Audit– Logs => C:\WINNT\System32\Config\*.evt
• WIN2K: Administrative Tools| Local Security Policy– Logs => C:\WINNT\System32\Config\*.evt
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UTSA IS 6353 Incident Response
Other Steps
• Application Logging• Backup Critical Data
– Unix: dump, restor, cpio, tar & dd– WIN2K: Start|Programs|Accessories| System
Utilities| Backup– NT: NT Backup (NT Resources Kit)– WIN98: Start|Accessories| System Utilities| Backup
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UTSA IS 6353 Incident Response
Network Preparations
• Know your network: document, document, document–hardware, software, users
• Smart topology/architecture• Use access control list (ACL) on
router
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UTSA IS 6353 Incident Response
Network Preparations-contd
• Require authentication (host, network, kerberos, IPsec)
• Audit regularly (manpower intensive)• Use network time protocol (NTP) to
synchronize all events
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UTSA IS 6353 Incident Response
Organizational Preparations
• Institute comprehensive policies• Institute comprehensive procedures• Develop response procedures
– Firedrills?
• Create a response toolkit• Establish an Incident Response Team• Obtain top-level management support
– Agree to ground rules/ rules of engagement
Often overlooked
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UTSA IS 6353 Incident Response
Response Toolkits
• High-end processor w/lots of memory• Large IDE and SCSI drives• Backup storage: CD-RW and Tape Drives• Spare cables• Router/Hub and network interface card• Digital camera• Trusted software
ref: www.computer-forensics.com
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UTSA IS 6353 Incident Response
Establish Incident Response Team
• Technical experts• Management POC• Team leader/principal investigator• Decide on mission/goal
“Critical thinking team players who enjoy hardwork and long hours”
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UTSA IS 6353 Incident Response
IR Professional Organizations
Training• WWW.SANS.ORG• WWW.FOUNDSTONE.COM• WWW.CERT.ORG
Organizations• Information Sharing and
Analysis Centers (ISACs)• InfraGard• High Tech Investigation
Association• Information Systems
Security Association (ISSA)
• Forum of Incident Response and Security Teams (FIRST)
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Investigative Guidelines
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UTSA IS 6353 Incident Response
Investigative Guidelines
• Initial assessment• Incident notification checklist• Investigating• Formulating Response Strategy
Initial assessment not always accurate
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UTSA IS 6353 Incident Response
Initial Assessment
• What probably happened?– Uncertainty regins– Each situation unique– Need to learn enough to determine course of action
• What is the best response strategy?– Does it meet pre-established goals/ROEs?– Does it have management support?– Will your team need outside help?
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UTSA IS 6353 Incident Response
Incident Notification Checklist
• WWW.CERT.ORG• Collect network maps and know
architecture• Verify corporate policies
– Many actions can only be taken if appropriate policies exist
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UTSA IS 6353 Incident Response
Investigating the Incident
• Prime directive: DO NO HARM• Personnel interviews• Hands-on activities• Many suspected incidents turn into non-
events• Will the investigation do more damage than
the incident itself?
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UTSA IS 6353 Incident Response
Investigating the Incident-contd
• Personnel interviews– System administrators: logs– Managers: know workforce, critical data– End-users
• Taking hands-on actions– Step carefully– My contaminate “crime scene”
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UTSA IS 6353 Incident Response
Formulate Response Strategy
• Declare Incident• Restore Normal Operations?
– Off-line recovery– On-line recovery
• Determine public relations play– “To spin or not to spin?”
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UTSA IS 6353 Incident Response
Formulate Response Strategy-contd
• Determine probable attacker– Internal: handle internally– External: prosecute?
• Determine Type of Attack– DOS, Theft, Vandalism, Policy violation,
ongoing intrusion
• Classify victim system– Critical server/application?– # of users?
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UTSA IS 6353 Incident Response
Closing Thought• “The biggest problem for 2001 was keeping
servers running MS-Windows products properly patched. We have numerous servers, and it’s constant fight to keep up with the patch level and test to confirm that the new patch doesn’t break something. This is the same problem for 2002.”
• J.G.• Do we still have this issue today? For what
OSes? Applications?Peace of mind depends on the action plan for response.
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UTSA IS 6353 Incident Response
Summary
• Prepare for Incidents• Build a good team• Rehearse/Practice procedures• Perform initial assessment• Formulate response• Do No Harm