Threat Hunting
briiirussell/cybersecurity-skills
Conduct proactive, hypothesis-driven threat hunts — search SIEM / EDR / logs for adversaries who haven't tripped an alert yet.
Agent skill
Hunting For Anomalous Powershell Execution
Hunt for malicious PowerShell activity by analyzing Script Block Logging (Event 4104), Module Logging (Event 4103), and process creation events.
Install Hunting For Anomalous Powershell Execution
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-anomalous-powershell-execution -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-anomalous-powershell-execution --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/hunting-for-anomalous-powershell-execution .claude/skills/hunting-for-anomalous-powershell-execution && 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 "hunting-for-anomalous-powershell-execution" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-anomalous-powershell-execution into .claude/skills/hunting-for-anomalous-powershell-execution/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-anomalous-powershell-execution", 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/hunting-for-anomalous-powershell-executionType 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 hunting-for-anomalous-powershell-execution -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-anomalous-powershell-execution --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/hunting-for-anomalous-powershell-execution .agents/skills/hunting-for-anomalous-powershell-execution && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "hunting-for-anomalous-powershell-execution" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-anomalous-powershell-execution into .agents/skills/hunting-for-anomalous-powershell-execution/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-anomalous-powershell-execution", 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 hunting-for-anomalous-powershell-execution -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-anomalous-powershell-execution --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/hunting-for-anomalous-powershell-execution .cursor/skills/hunting-for-anomalous-powershell-execution && 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 "hunting-for-anomalous-powershell-execution" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-anomalous-powershell-execution into .cursor/skills/hunting-for-anomalous-powershell-execution/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-anomalous-powershell-execution", 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/hunting-for-anomalous-powershell-execution--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 hunting-for-anomalous-powershell-execution -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-anomalous-powershell-execution --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/hunting-for-anomalous-powershell-execution .gemini/skills/hunting-for-anomalous-powershell-execution && 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 "hunting-for-anomalous-powershell-execution" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-anomalous-powershell-execution into .gemini/skills/hunting-for-anomalous-powershell-execution/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-anomalous-powershell-execution", 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 hunting-for-anomalous-powershell-executionInstalls 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 hunting-for-anomalous-powershell-execution -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/hunting-for-anomalous-powershell-execution .github/skills/hunting-for-anomalous-powershell-execution && 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 "hunting-for-anomalous-powershell-execution" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-anomalous-powershell-execution into .github/skills/hunting-for-anomalous-powershell-execution/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-anomalous-powershell-execution", 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 hunting-for-anomalous-powershell-execution -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 hunting-for-anomalous-powershell-execution --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/hunting-for-anomalous-powershell-execution .opencode/skills/hunting-for-anomalous-powershell-execution && 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 "hunting-for-anomalous-powershell-execution" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-anomalous-powershell-execution into .opencode/skills/hunting-for-anomalous-powershell-execution/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-anomalous-powershell-execution", 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
hunting-for-anomalous-powershell-execution- GitHub stars
- 34k
- Token cost
- ~638 tokens
- SKILL.md length
- 200 words
- Files
- 4 (incl. scripts, references)
- Skills in repo
- 644
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Hunt for malicious PowerShell activity by analyzing Script Block Logging (Event 4104), Module Logging (Event 4103), and process creation events.
- Works in 6 steps: Parse EVTX files extracting Event 4104… → Reassemble multi-part script blocks… → Scan script text for AMSI bypass… → …
- Tasks that involve Security operations
- SKILL.md covers Overview, When to Use, Prerequisites and Steps, plus 1 more section
- Runs Python scripts from its folder
What it does
Hunting For Anomalous Powershell Execution is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Hunt for malicious PowerShell activity by analyzing Script Block Logging (Event 4104), Module Logging (Event 4103), and process creation events. The analyst parses Windows Event Log EVTX files to detect obfuscated commands, AMSI bypass attempts, encoded payloads, credential dumping keywords, and suspicious download cradles. Activates for requests involving PowerShell threat hunting, script block analysis, encoded command detection, or AMSI bypass identification.
Its SKILL.md is about 640 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `references/api-reference.md` and `scripts/agent.py`).
It sits in Security, covering Security operations. It works with PowerShell. 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
- Tasks that involve Security operations
Example prompts
- “/hunting-for-anomalous-powershell-execution”
Requirements
- Python 3
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Parse EVTX files extracting Event 4104 script block text and metadata
- Reassemble multi-part script blocks using ScriptBlock ID correlation
- Scan script text for AMSI bypass indicators and obfuscation patterns
- Detect encoded command execution and base64 payloads
- Identify download cradles, credential dumping, and lateral movement commands
- Score and prioritize findings by threat severity
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 1 file 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
Hunting For Anomalous Powershell Execution loads about 638 tokens when it runs, and up to ~1.7k if it reads all its reference files. Until then it costs about 127 tokens; SKILL.md has 200 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). 200 words, ~638 tokens.
Download SKILL.mdSave it as
.claude/skills/hunting-for-anomalous-powershell-execution/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- hunting-for-anomalous-powershell-execution
- description
- Hunt for malicious PowerShell activity by analyzing Script Block Logging (Event 4104), Module Logging (Event 4103), and process creation events. The analyst parses Windows Event Log EVTX files to detect obfuscated commands, AMSI bypass attempts, encoded payloads, credential dumping keywords, and suspicious download cradles. Activates for requests involving PowerShell threat hunting, script block analysis, encoded command detection, or AMSI bypass identification.
- domain
- cybersecurity
- subdomain
- threat-hunting
- tags
- powershell, script-block-logging, event-4104, amsi, threat-hunting, evtx, obfuscation
- version
- 1.0
- author
- mahipal
- license
- Apache-2.0
- nist_csf
- DE.CM-01, DE.AE-02, DE.AE-07, ID.RA-05
- mitre_attack
- T1046, T1057, T1082, T1083, T1003
Hunting for Anomalous PowerShell Execution
Overview
PowerShell Script Block Logging (Event ID 4104) records the full deobfuscated script text executed on a Windows endpoint, making it the primary data source for hunting malicious PowerShell. Combined with Module Logging (4103) and process creation events, analysts can detect encoded commands, AMSI bypass patterns, download cradles, credential theft tools, and fileless attack techniques even when the attacker uses obfuscation layers.
When to Use
- When investigating security incidents that require hunting for anomalous powershell execution
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Windows Event Log exports (.evtx) from Microsoft-Windows-PowerShell/Operational
- Python 3.8+ with python-evtx and lxml libraries
- Script Block Logging enabled via Group Policy
- Understanding of common PowerShell attack techniques
Steps
- Parse EVTX files extracting Event 4104 script block text and metadata
- Reassemble multi-part script blocks using ScriptBlock ID correlation
- Scan script text for AMSI bypass indicators and obfuscation patterns
- Detect encoded command execution and base64 payloads
- Identify download cradles, credential dumping, and lateral movement commands
- Score and prioritize findings by threat severity
Expected Output
{
"total_events": 1247,
"suspicious_events": 23,
"amsi_bypass_attempts": 2,
"encoded_commands": 8,
"download_cradles": 5,
"credential_access": 3
}© 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 3 other files (scripts, references) in skills/hunting-for-anomalous-powershell-execution of mukul975/Anthropic-Cybersecurity-Skills.
- SKILL.md
- LICENSE
- references/api-reference.md
- scripts/agent.py
Open the folder on GitHubat commit 54a7988
Compare with similar skills
Hunting For Anomalous Powershell Execution 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 |
|---|---|---|---|---|---|---|
| Hunting For Anomalous Powershell Execution this skillmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~638 | Automated safety check: Pass | Apache-2.0 | |
| Threat Huntingbriiirussell/cybersecurity-skills | 413 | — | ~2.9k | Automated safety check: Notes | MIT | |
| Windows Log Hunterptn1411/skill | 219 | — | ~1k | Automated safety check: Notes | None | |
| Security Alert Triageelastic/agent-skills | 592 | 1 repos | ~3.5k | Automated safety check: Notes | Apache-2.0 | |
| Kubernetes Network Security Auditkubeshark/kubeshark | 12k | — | ~7.3k | Automated safety check: Notes | Apache-2.0 | |
| Security Detection Rule Managementelastic/agent-skills | 592 | 1 repos | ~3.9k | Automated safety check: Notes | Apache-2.0 |
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Related
Works with
Categories
Questions about Hunting For Anomalous Powershell Execution
What does Hunting For Anomalous Powershell Execution do?
Hunt for malicious PowerShell activity by analyzing Script Block Logging (Event 4104), Module Logging (Event 4103), and process creation events. Hunting For Anomalous Powershell Execution is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Hunt for malicious PowerShell activity by analyzing Script Block Logging (Event 4104), Module Logging (Event 4103), and process creation events.
When should I use Hunting For Anomalous Powershell Execution?
Hunting For Anomalous Powershell Execution fits situations like: tasks that involve Security operations.
How do I install Hunting For Anomalous Powershell Execution in Claude Code?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-anomalous-powershell-execution -a claude-code`. Or copy the skill folder (skills/hunting-for-anomalous-powershell-execution in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/hunting-for-anomalous-powershell-execution in your project. Claude Code loads it when a task matches its description.
How do I install Hunting For Anomalous Powershell Execution in Codex?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-anomalous-powershell-execution -a codex`. Or copy the skill folder (skills/hunting-for-anomalous-powershell-execution in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/hunting-for-anomalous-powershell-execution in your project. Codex loads it when a task matches its description.
Can I use Hunting For Anomalous Powershell Execution 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 hunting-for-anomalous-powershell-execution -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/hunting-for-anomalous-powershell-execution, .gemini/skills/hunting-for-anomalous-powershell-execution, .github/skills/hunting-for-anomalous-powershell-execution and .opencode/skills/hunting-for-anomalous-powershell-execution in your project.
What does Hunting For Anomalous Powershell Execution need to run?
Going by SKILL.md and its folder, Hunting For Anomalous Powershell Execution needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Hunting For Anomalous Powershell Execution 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 Hunting For Anomalous Powershell Execution 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 Hunting For Anomalous Powershell Execution use?
Hunting For Anomalous Powershell Execution 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 Hunting For Anomalous Powershell Execution use?
About 638 tokens (SKILL.md is roughly 2.6k 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 1.1k tokens, read only when the agent opens those files.
What are the alternatives to Hunting For Anomalous Powershell Execution?
Skills that share tags, products or a category with Hunting For Anomalous Powershell Execution: Threat Hunting (briiirussell/cybersecurity-skills, 413 stars), Windows Log Hunter (ptn1411/skill, 219 stars), Security Alert Triage (elastic/agent-skills, 592 stars) and Kubernetes Network Security Audit (kubeshark/kubeshark, 12k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Hunting For Anomalous Powershell Execution?
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.