Anthropic-Cybersecurity-Skills/skills/performing-active-directory-compromise-investigation/assets/template.md

Active Directory Compromise Investigation Report Template

Case Information

Field	Details
Case ID	IR-AD-YYYY-XXX
Investigator
Date Initiated
Organization
Domain(s) Affected
Domain Controllers
Estimated Compromise Date

Executive Summary

[Brief description of the AD compromise, scope, and critical findings]

Scope of Investigation

Domain Controllers Examined

DC Name	OS Version	IP Address	Role	Status

Log Sources Collected

• Security Event Logs (all DCs)
• System Event Logs
• Directory Service Logs
• DNS Server Logs
• PowerShell Transcription Logs
• Replication Metadata
• GPO Configuration Export
• Privileged Group Membership Export

Attack Timeline

Timestamp	Event	Source	Severity
	Initial access
	Privilege escalation
	Lateral movement
	Domain compromise
	Data access/exfiltration

Findings

Finding 1: [Attack Category]

• Severity: CRITICAL / HIGH / MEDIUM / LOW
• Evidence: [Event IDs, log entries, artifacts]
• Impact: [Accounts, systems, data affected]
• MITRE ATT&CK: [Technique ID and name]

Finding 2: [Attack Category]

• Severity:
• Evidence:
• Impact:
• MITRE ATT&CK:

Compromised Accounts

Account	Type	Privileges	Compromise Method	Status
	Domain Admin		DCSync	Disabled
	Service Account		Kerberoasting	Reset

Kerberos Analysis

Golden Ticket Assessment

• krbtgt password age: _____ days
• TGTs with abnormal lifetimes detected: Yes / No
• RC4 encryption on tickets detected: Yes / No
• Service tickets without TGT requests: Yes / No

Kerberoasting Assessment

• Bulk TGS requests from single source: Yes / No
• Service accounts with weak passwords: Yes / No
• Service accounts targeted: _____ accounts

Lateral Movement Map

[Source] --> [Hop 1] --> [Hop 2] --> [Domain Controller]
   |
   +--> [Hop 1b] --> [File Server]

Persistence Mechanisms Found

• AdminSDHolder ACL modifications
• SID History injection
• Rogue GPO policies
• Skeleton Key malware
• DCShadow objects
• Rogue AD CS certificates
• Scheduled tasks via GPO
• Modified login scripts
• Custom WMI subscriptions

Remediation Actions

Immediate (0-24 hours)

• Disable all compromised accounts
• Isolate compromised systems
• Block attacker IP addresses at firewall
• Double-rotate krbtgt password
• Revoke all active sessions

Short-term (24-72 hours)

• Reset all privileged account passwords
• Reset all service account passwords
• Remove unauthorized group memberships
• Revert malicious GPO changes
• Remove persistence mechanisms

Long-term (1-4 weeks)

• Force all user password changes
• Implement tiered administration model
• Deploy Privileged Access Workstations
• Enable Microsoft Defender for Identity
• Implement LAPS for local admin passwords
• Configure advanced audit policies
• Add critical accounts to Protected Users group

Indicators of Compromise

Accounts

Account	Type	Activity

IP Addresses

IP	Activity	First Seen	Last Seen

Tools Detected

Tool	Hash	Location	Purpose

Appendix

Event Log Analysis Summary

BloodHound Attack Path Diagrams

GPO Change Detail

Network Diagram with Lateral Movement Overlay