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apt29-cozy-bear

100 / 100 · Low risk

Fine to try.

By BitterSecurity/Decepticon (GitHub) · coding · 6,581 stars · scanned at commit bdb1016

Adversary-emulation profile for APT29 (Cozy Bear / Midnight Blizzard / NOBELIUM / The Dukes), Russia's SVR-attributed cyber-espionage group, mapping its ATT&CK TTPs to Decepticon emulation tooling.

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/'apt29-cozy-bear' ] || [ -L ~/.agents/skills/'apt29-cozy-bear' ]; then echo 'A skill folder named apt29-cozy-bear already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/BitterSecurity/Decepticon' "$d" && git -C "$d" checkout --quiet 'bdb1016c93ed687f61ac57481da298c25a47c8f5' -- 'packages/decepticon/decepticon/skills/shared/adversary-emulation/apt29-cozy-bear' && mkdir -p ~/.agents/skills && cp -R "$d"/'packages/decepticon/decepticon/skills/shared/adversary-emulation/apt29-cozy-bear' ~/.agents/skills/'apt29-cozy-bear' && 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/'apt29-cozy-bear' ~/.claude/skills/'apt29-cozy-bear' (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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