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hunting-for-anomalous-powershell-execution

100 / 100 · Low risk

Fine to try.

By plurigrid/asi (GitHub) · security · 72 stars · scanned at commit 293ce9f

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.

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'hunting-for-anomalous-powershell-execution' ] || [ -L ~/.agents/skills/'hunting-for-anomalous-powershell-execution' ]; then echo 'A skill folder named hunting-for-anomalous-powershell-execution already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/plurigrid/asi' "$d" && git -C "$d" checkout --quiet '293ce9f76e3abcd5ba18db284688bc0d9ac6691d' -- 'plugins/asi/skills/hunting-for-anomalous-powershell-execution' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/asi/skills/hunting-for-anomalous-powershell-execution' ~/.agents/skills/'hunting-for-anomalous-powershell-execution' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'hunting-for-anomalous-powershell-execution' ~/.claude/skills/'hunting-for-anomalous-powershell-execution' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history