Conducting Phishing Incident Response
Responds to phishing incidents by analyzing reported emails, extracting indicators...
Install
npx skills add AgentFlocks/flocks --skill conducting-phishing-incident-response -g -a claude-code -y- Repository
- AgentFlocks/flocks504
- Category
- Engineering
- Updated
- 5d ago
- License
- Apache-2.0
- Context cost
- Mediumabout 2,560 tokens
- Runs scripts
- Yes, review before use
What it does
Responds to phishing incidents by analyzing reported emails, extracting indicators, assessing credential compromise, quarantining malicious messages across the organization, and remediating affected accounts. Covers email header analysis, URL/attachment sandboxing, and mailbox-wide purge operations. Activates for requests involving phishing response, email incident, credential phishing, spear phishing investigation, or phishing remediation.
Conducting Phishing Incident Response
When to Use
- A user reports receiving a suspicious email via the phishing report button or abuse mailbox
- Email gateway detects a malicious email that bypassed initial filtering
- Threat intelligence indicates an active phishing campaign targeting the organization
- A user confirms they clicked a link or opened an attachment from a suspicious email
- Credentials have been entered on a suspected phishing page
Do not use for business email compromise (BEC) involving compromised internal accounts; use BEC response procedures which focus on account takeover investigation.
Prerequisites
- Email security gateway with message trace and quarantine capabilities (Microsoft Defender for Office 365, Proofpoint, Mimecast)
- Microsoft 365 admin access or Google Workspace admin for mailbox search and purge
- Malware sandbox for attachment and URL analysis (ANY.RUN, Joe Sandbox, Hybrid Analysis)
- Email header analysis tools (MXToolbox Header Analyzer, Google Admin Toolbox)
- Identity provider access for account remediation (Azure AD, Okta, Duo)
- Phishing report intake process (dedicated mailbox or integrated report button)
Workflow
Step 1: Receive and Triage the Phishing Report
Evaluate the reported email to determine if it is malicious:
- Extract the email as an .EML or .MSG file (preserves headers)
- Analyze email headers to determine the true sender, relay path, and authentication results
Email Header Analysis Checklist:
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Return-Path: billing@spoofed-domain[.]com
From: "IT Support" <support@corp-lookalike[.]com>
Reply-To: attacker@gmail[.]com (different from From)
SPF: FAIL (sender IP not authorized for domain)
DKIM: FAIL (signature invalid)
DMARC: FAIL (policy: none - no enforcement)
Received: from mail.attacker-infra[.]net [45.33.x.x]
X-Originating-IP: 45.33.x.x
Message-ID: <random@attacker-infra.net>
