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JuliusBrussee/skills
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Agent skill
Detecting Email Forwarding Rules Attack
Detect malicious inbox/mail-flow forwarding rules that adversaries create to maintain persistent access to email communications for intelligence collection and business email compromise.
Install Detecting Email Forwarding Rules Attack
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-email-forwarding-rules-attack --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/detecting-email-forwarding-rules-attack .claude/skills/detecting-email-forwarding-rules-attack && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "detecting-email-forwarding-rules-attack" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attack into .claude/skills/detecting-email-forwarding-rules-attack/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "detecting-email-forwarding-rules-attack", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attackType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-email-forwarding-rules-attack --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/detecting-email-forwarding-rules-attack .agents/skills/detecting-email-forwarding-rules-attack && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "detecting-email-forwarding-rules-attack" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attack into .agents/skills/detecting-email-forwarding-rules-attack/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "detecting-email-forwarding-rules-attack", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-email-forwarding-rules-attack --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/detecting-email-forwarding-rules-attack .cursor/skills/detecting-email-forwarding-rules-attack && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "detecting-email-forwarding-rules-attack" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attack into .cursor/skills/detecting-email-forwarding-rules-attack/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "detecting-email-forwarding-rules-attack", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git --path skills/detecting-email-forwarding-rules-attack--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-email-forwarding-rules-attack --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/detecting-email-forwarding-rules-attack .gemini/skills/detecting-email-forwarding-rules-attack && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "detecting-email-forwarding-rules-attack" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attack into .gemini/skills/detecting-email-forwarding-rules-attack/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "detecting-email-forwarding-rules-attack", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-email-forwarding-rules-attackInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/detecting-email-forwarding-rules-attack .github/skills/detecting-email-forwarding-rules-attack && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "detecting-email-forwarding-rules-attack" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attack into .github/skills/detecting-email-forwarding-rules-attack/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "detecting-email-forwarding-rules-attack", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills detecting-email-forwarding-rules-attack --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/detecting-email-forwarding-rules-attack .opencode/skills/detecting-email-forwarding-rules-attack && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "detecting-email-forwarding-rules-attack" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/detecting-email-forwarding-rules-attack into .opencode/skills/detecting-email-forwarding-rules-attack/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "detecting-email-forwarding-rules-attack", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
detecting-email-forwarding-rules-attack- GitHub stars
- 34k
- Token cost
- ~918 tokens
- SKILL.md length
- 310 words
- Files
- 8 (incl. scripts, references, assets)
- Skills in repo
- 644
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Detect malicious inbox/mail-flow forwarding rules that adversaries create to maintain persistent access to email communications for intelligence collection and business email compromise.
- Works in 7 steps: Formulate Hypothesis: Define a testable… → Identify Data Sources: Determine which… → Execute Queries: Run detection queries… → …
- Hunting for suspicious auto-forwarding
- SKILL.md covers When to Use, Prerequisites, Workflow and Key Concepts, plus 3 more sections
- Runs Python scripts from its folder
What it does
Detecting Email Forwarding Rules Attack is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detect malicious inbox/mail-flow forwarding rules that adversaries create to maintain persistent access to email communications for intelligence collection and business email compromise. Use when hunting for suspicious auto-forwarding, hidden mailbox rules, or T1114-style email collection persistence after a compromised account or BEC incident.
Its SKILL.md is about 920 tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).
It sits in Security, covering Email management. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.
When your agent uses it
- Hunting for suspicious auto-forwarding
- Hidden mailbox rules
- T1114-style email collection persistence after a compromised account
Example prompts
- “/detecting-email-forwarding-rules-attack”
Requirements
- Python 3
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Formulate Hypothesis: Define a testable hypothesis based on threat intelligence or ATT&CK gap analysis.
- Identify Data Sources: Determine which logs and telemetry are needed to validate or refute the hypothesis.
- Execute Queries: Run detection queries against SIEM and EDR platforms to collect relevant events.
- Analyze Results: Examine query results for anomalies, correlating across multiple data sources.
- Validate Findings: Distinguish true positives from false positives through contextual analysis.
- Correlate Activity: Link findings to broader attack chains and threat actor TTPs.
- Document and Report: Record findings, update detection rules, and recommend response actions.
What it can do on your machine
Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Detecting Email Forwarding Rules Attack loads about 918 tokens when it runs, and up to ~2.5k if it reads all its reference files. Until then it costs about 97 tokens; SKILL.md has 310 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 310 words, ~918 tokens.
Download SKILL.mdSave it as
.claude/skills/detecting-email-forwarding-rules-attack/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.- name
- detecting-email-forwarding-rules-attack
- description
- Detect malicious inbox/mail-flow forwarding rules that adversaries create to maintain persistent access to email communications for intelligence collection and business email compromise. Use when hunting for suspicious auto-forwarding, hidden mailbox rules, or T1114-style email collection persistence after a compromised account or BEC incident.
- domain
- cybersecurity
- subdomain
- threat-hunting
- tags
- threat-hunting, mitre-attack, email-forwarding, persistence, bec, t1114, proactive-detection
- version
- 1.0
- author
- mahipal
- license
- Apache-2.0
- d3fend_techniques
- Restore Object, Restore Configuration, Application Configuration Hardening, Application Hardening, Disable Remote Access
- nist_csf
- DE.CM-01, DE.AE-02, DE.AE-07, ID.RA-05
- mitre_attack
- T1046, T1057, T1082, T1083, T1547
Detecting Email Forwarding Rules Attack
When to Use
- When proactively hunting for indicators of detecting email forwarding rules attack in the environment
- After threat intelligence indicates active campaigns using these techniques
- During incident response to scope compromise related to these techniques
- When EDR or SIEM alerts trigger on related indicators
- During periodic security assessments and purple team exercises
Prerequisites
- EDR platform with process and network telemetry (CrowdStrike, MDE, SentinelOne)
- SIEM with relevant log data ingested (Splunk, Elastic, Sentinel)
- Sysmon deployed with comprehensive configuration
- Windows Security Event Log forwarding enabled
- Threat intelligence feeds for IOC correlation
Workflow
- Formulate Hypothesis: Define a testable hypothesis based on threat intelligence or ATT&CK gap analysis.
- Identify Data Sources: Determine which logs and telemetry are needed to validate or refute the hypothesis.
- Execute Queries: Run detection queries against SIEM and EDR platforms to collect relevant events.
- Analyze Results: Examine query results for anomalies, correlating across multiple data sources.
- Validate Findings: Distinguish true positives from false positives through contextual analysis.
- Correlate Activity: Link findings to broader attack chains and threat actor TTPs.
- Document and Report: Record findings, update detection rules, and recommend response actions.
Key Concepts
| Concept | Description |
|---|---|
| T1114.003 | Email Forwarding Rule |
| T1114.002 | Remote Email Collection |
| T1098.002 | Additional Email Delegate Permissions |
Tools & Systems
| Tool | Purpose |
|---|---|
| CrowdStrike Falcon | EDR telemetry and threat detection |
| Microsoft Defender for Endpoint | Advanced hunting with KQL |
| Splunk Enterprise | SIEM log analysis with SPL queries |
| Elastic Security | Detection rules and investigation timeline |
| Sysmon | Detailed Windows event monitoring |
| Velociraptor | Endpoint artifact collection and hunting |
| Sigma Rules | Cross-platform detection rule format |
Common Scenarios
- Scenario 1: BEC actor creating forwarding rule to external email
- Scenario 2: Compromised account with rule deleting security alerts
- Scenario 3: Inbox rule forwarding CEO emails to attacker mailbox
- Scenario 4: OAuth app abuse creating transport rules for data collection
Output Format
Hunt ID: TH-DETECT-[DATE]-[SEQ]
Technique: T1114.003
Host: [Hostname]
User: [Account context]
Evidence: [Log entries, process trees, network data]
Risk Level: [Critical/High/Medium/Low]
Confidence: [High/Medium/Low]
Recommended Action: [Containment, investigation, monitoring]© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 7 other files (scripts, references, assets) in skills/detecting-email-forwarding-rules-attack of mukul975/Anthropic-Cybersecurity-Skills.
- SKILL.md
- LICENSE
- assets/template.md
- references/api-reference.md
- references/standards.md
- references/workflows.md
- scripts/agent.py
- scripts/process.py
Open the folder on GitHubat commit 54a7988
Compare with similar skills
Detecting Email Forwarding Rules Attack next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Detecting Email Forwarding Rules Attack this skillmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~918 | Automated safety check: Pass | Apache-2.0 | |
| Loop FactoryJuliusBrussee/skills | 162 | — | ~2k | Automated safety check: Pass | MIT | |
| Agent Email Inboxviclafouch/meme-studio | 110 | 2 repos | ~10k | Automated safety check: Warn | None | |
| Google Workspace CLIalirezarezvani/claude-skills | 28k | — | ~3k | Automated safety check: Notes | MIT | |
| Working With ScoutsPostHog/posthog | 40k | — | ~8.7k | Automated safety check: Pass | Custom licence | |
| Deliverability Incident Responsegrowthenginenowoslawski/coldoutboundskills | 753 | — | ~3.5k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Detecting Email Forwarding Rules Attack
What does Detecting Email Forwarding Rules Attack do?
Detect malicious inbox/mail-flow forwarding rules that adversaries create to maintain persistent access to email communications for intelligence collection and business email compromise. Detecting Email Forwarding Rules Attack is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detect malicious inbox/mail-flow forwarding rules that adversaries create to maintain persistent access to email communications for intelligence collection and business email compromise.
When should I use Detecting Email Forwarding Rules Attack?
Detecting Email Forwarding Rules Attack fits situations like: hunting for suspicious auto-forwarding; hidden mailbox rules; T1114-style email collection persistence after a compromised account.
How do I install Detecting Email Forwarding Rules Attack in Claude Code?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a claude-code`. Or copy the skill folder (skills/detecting-email-forwarding-rules-attack in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/detecting-email-forwarding-rules-attack in your project. Claude Code loads it when a task matches its description.
How do I install Detecting Email Forwarding Rules Attack in Codex?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a codex`. Or copy the skill folder (skills/detecting-email-forwarding-rules-attack in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/detecting-email-forwarding-rules-attack in your project. Codex loads it when a task matches its description.
Can I use Detecting Email Forwarding Rules Attack in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill detecting-email-forwarding-rules-attack -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/detecting-email-forwarding-rules-attack, .gemini/skills/detecting-email-forwarding-rules-attack, .github/skills/detecting-email-forwarding-rules-attack and .opencode/skills/detecting-email-forwarding-rules-attack in your project.
What does Detecting Email Forwarding Rules Attack need to run?
Going by SKILL.md and its folder, Detecting Email Forwarding Rules Attack needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Detecting Email Forwarding Rules Attack access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Detecting Email Forwarding Rules Attack safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Detecting Email Forwarding Rules Attack use?
Detecting Email Forwarding Rules Attack is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Detecting Email Forwarding Rules Attack use?
About 918 tokens (SKILL.md is roughly 3.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.6k tokens, read only when the agent opens those files.
What are the alternatives to Detecting Email Forwarding Rules Attack?
Skills that share tags, products or a category with Detecting Email Forwarding Rules Attack: Loop Factory (JuliusBrussee/skills, 162 stars), Agent Email Inbox (viclafouch/meme-studio, 110 stars), Google Workspace CLI (alirezarezvani/claude-skills, 28k stars) and Working With Scouts (PostHog/posthog, 40k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Detecting Email Forwarding Rules Attack?
mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.
Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.