conducting-phishing-incident-response

conducting-phishing-incident-response is a skill for Claude Code from 26zl/cybersec-toolkit. It costs 79 tokens per session (2,439 once invoked), scanned A, original, MIT.

A guide to handling phishing incidents after suspicious emails reach an organization. It covers examining email headers, links, and attachments, checking for stolen credentials, removing malicious messages, and fixing affected accounts.

In plain words
What is it for?
Use it to investigate reported phishing emails, analyze links and attachments in a sandbox, search organization-wide mailboxes, purge messages, and remediate accounts.
Why use it?
It gives responders a process for determining who was affected and stopping the same message from harming more people. It also helps contain compromised accounts and remove dangerous mailboxes contents.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Part of the cybersec-toolkit plugin — 197 skills, 2 hooks, 1 MCP server shipped together

Good fit Use it to investigate reported phishing emails, analyze links and attachments in a sandbox, search organization-wide mailboxes, purge messages, and remediate accounts.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/26zl/cybersec-toolkit/conducting-phishing-incident-response
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add 26zl/cybersec-toolkit --skill conducting-phishing-incident-response
Clone the repo
git clone --depth 1 https://github.com/26zl/cybersec-toolkit

Made for: Claude Code.

Or install cybersec-toolkit, the plugin that ships this one along with the rest of its 197 skills, 2 hooks, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for conducting-phishing-incident-response

README.md
[![agentmods](https://agentmods.dev/badge/skills/26zl/cybersec-toolkit/conducting-phishing-incident-response/github.svg)](https://agentmods.dev/skills/26zl/cybersec-toolkit/conducting-phishing-incident-response)
Your own site
<a href="https://agentmods.dev/skills/26zl/cybersec-toolkit/conducting-phishing-incident-response"><img src="https://agentmods.dev/badge/skills/26zl/cybersec-toolkit/conducting-phishing-incident-response/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for conducting-phishing-incident-response

Your own site · 80×15
<a href="https://agentmods.dev/skills/26zl/cybersec-toolkit/conducting-phishing-incident-response"><img src="https://agentmods.dev/badge/skills/26zl/cybersec-toolkit/conducting-phishing-incident-response.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,439 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00079 $0.02439
Opus 5 $0.00039 $0.01220
Sonnet 5 $0.00016 $0.00488
Haiku 4.5 $0.00008 $0.00244

Measured 9d ago against content hash 78901550c6b2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

conducting-phishing-incident-response scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/agent.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.claude/skills/conducting-phishing-incident-response/SKILL.md · 258 lines

How it starts

The opening of the file, as written. The whole thing — 258 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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:      <[email protected]>

Classification criteria:

  • Confirmed Phishing: Malicious URL/attachment, spoofed sender, credential harvesting page
  • Suspicious: Anomalous headers but no confirmed malicious content
  • Spam/Marketing: Unwanted but not malicious
  • Legitimate: Not a phishing email (false report)

Read the full file on GitHub · 258 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 258 lines · 79 tokens per session scan A 78901550c6b2

Subscribe to this mod's changes

conducting-phishing-incident-response is a skill published in the GitHub repository 26zl/cybersec-toolkit (54 stars, last pushed yesterday), licensed MIT. It adds 79 tokens to every session and 2,439 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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