skills/edr-bypass-re/SKILL.md
Reverse engineer EDR internals (user-mode hook tables, ETW, AMSI) and study bypass techniques such as direct syscalls, Hell's Gate, and call-stack spoofing. Lab-only red-team research.
npx skillsauth add ranbot-ai/awesome-skills edr-bypass-reInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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⚠️ AUTHORIZED USE ONLY This skill is for educational purposes or authorized security assessments only. You must have explicit, written permission from the system owner before using this tool. Misuse of this tool is illegal and strictly prohibited.
Mandatory confirmation gate Before running any command that probes, exploits, changes, persists on, extracts data from, or attempts credential access against a target:
- Ask the user to state the exact target URL, IP, account, or resource.
- Ask the user to confirm written authorization and the permitted scope.
- Show the exact command(s) and explain their expected effect.
- Wait for explicit confirmation in the current conversation.
Without that confirmation, remain read-only and provide defensive guidance only. Prefer a sandbox, disposable VM, or controlled lab.
红队 / 对抗模拟在已获授权的目标主机投递 implant 并躲避现代 EDR 时使用本 skill。
不适用场景:
| 场景 | 用什么 |
|------|--------|
| 全链路攻防(从外网打到域控) | attack-chain/ |
| 内网横向 / AD 攻击 | pentest-tools/network-attack-defense.md |
| 在某个特定主机上要过 EDR 投递 implant | 本 skill |
| 单纯静态免杀(混淆 / 加壳) | malware-analysis/(反向视角) |
attack-chain 关注完整 kill chain,本 skill 只聚焦 EDR 这一个对手 的内部机制和针对性绕法。
EDR 的四个主要监控面 红队的对策
───────────────────── ─────────────────────
用户态 ntdll hook ◄──► unhook (Peruns Fart / fresh ntdll)
间接 syscall / Hell's Gate
hardware breakpoint Blindside
kernel callback ◄──► call stack spoof
(Ps/Cm/Ob 系列) 走合法触发链(不直接绕,配合上游隐身)
ETW telemetry ◄──► EtwEventWrite patch
(Microsoft-Windows-Threat- NtTraceControl 关 provider
Intelligence 等) AmsiContext 同步处理
AMSI 扫描 ◄──► AmsiScanBuffer patch (mov eax,0x80070057; ret)
(amsi.dll) hardware breakpoint 旁路
reflective 加载副本 amsi.dll
关键认知:
# 列出常见 EDR / AV 驱动
Get-Service | Where-Object {$_.Name -match 'CSAgent|SentinelAgent|elasticendpoint|esets|ekrn|MsMpEng|wdsvc|cyserver|sysmon|aswbidsagent'}
# 列出加载的 minifilter
fltmc filters
# 列出已注册的内核 callback(需 windbg + 内核调试 / 或用 PChunter / DRVHV)
# !object \Callback
# !pnpcallback / Process / Thread / Image
EDR 指纹表见 references/hook-survey.md 顶部。
ntdll.dll 的 .text 段C:\Windows\System32\ntdll.dll 做 diff或者直接用 pe-sieve:
pe-sieve64.exe /pid 1234 /shellc 3 /modules 3 /dir hooks_dump
详细方法见 references/hook-survey.md。
| 防御点 | 推荐绕法 | |--------|---------| | ntdll inline hook | indirect syscall + 动态 SSN (Halo's Gate) | | ETW-TI provider | EtwEventWrite head patch | | AMSI(PowerShell / .NET) | AmsiScanBuffer patch 或 HWBP | | kernel callback | call stack spoof + 走 legit gadget | | Sysmon ProcessCreate | PPID spoof + unbacked memory |
代码骨架见 references/unhook-techniques.md 与 references/telemetry-blinding.md。
# 在隔离环境部署目标 EDR 试用版(Defender 默认即可起步)
# 启用 Sysmon + olaf-config
sysmon64.exe -i sysmonconfig.xml
# 跑 implant,看是否触发以下告警源:
# - Defender AMSI
# - ETW-TI
# - Sysmon Event ID 1/7/8/10
# - EDR 控制台
attack-chain 中的 initial access 节目标:Windows 11 Enterprise + Defender (云查杀开) + Sysmon (olaf 配置)
要求:beacon 落地后能 callback 且不触发任何告警
组合拳:
1. shellcode 加密存储,运行时解密
2. AMSI patch(如果走 PowerShell 投递)
3. EtwEventWrite patch(消 ETW-TI)
4. 间接 syscall + Halo's Gate(消 ntdll hook 告警)
5. PPID spoof 到 explorer.exe
6. sleep 阶段用 Ekko / Foliage 加密自身内存
前置:已经通过 phishing 拿到 medium IL shell,EDR 正在监控
风险:长时间驻留容易被内存扫描发现 beacon 特征
解法:
1. 不再申请新 RWX 内存
2. sleep 期间用 Ekko:
- WaitForSingleObjectEx + CreateTimerQueueTimer
- 在定时器里加密自身 .text + 把堆栈刷成全 0
3. wake 时用 ROP 还原
4. 配合 call stack spoof 让 RtlCaptureStackBackTrace 看不到信标地址
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