building-c2-infrastructure-with-sliver-framework
Deploy and harden a Sliver C2 team server (BishopFox's Go-based adversary emulation framework) with multi-protocol listeners (mTLS, HTTP/S, DNS, WireGuard), redirectors, domain fronting, and multi-operator support for authorized red-team operations. Use when standing up resilient C2 for a red-team engagement or generating beacon/session implants that must survive blue-team detection.
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Critical
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Security
3 findings: 2 critical severity, 1 medium severity. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E005: Suspicious download URL detected in skill instructions.
What this means
Detected a suspicious URL in the skill instructions that could lead the agent to download and execute malicious scripts or binaries. This includes links to executables from untrusted sources, typosquatting of official packages, URL shorteners that obscure the destination, and personal file hosting services.
Why it was flagged
These URLs include an install script that the doc instructs users to curl | sudo bash (https://sliver.sh/install) and a C2 domain used to host/generate implants (https://c2.example.com), both of which are high-risk indicators for remote code execution and malware distribution; the remaining links (BishopFox GitHub, Apache license) are legitimate/documentation resources and lower risk.
E006: Malicious code pattern detected in skill scripts.
What this means
Detected high-risk code patterns in the skill content — including its prompts, tool definitions, and resources — such as data exfiltration, backdoors, remote code execution, credential theft, system compromise, supply chain attacks, and obfuscation techniques.
Why it was flagged
This repository contains explicit, actionable instructions and automation to deploy and operate a command-and-control (C2) framework (Sliver) — including implant generation, listener setup, redirectors/domain fronting, post-exploitation modules (e.g., mimikatz), and automation tooling — indicating clear intent to create backdoor/C2 infrastructure and perform credential theft and remote control.
W013: Attempt to modify system services in skill instructions.
What this means
The skill prompts the agent to compromise the security or integrity of the user’s machine by modifying system-level services or configurations, such as obtaining elevated privileges, altering startup scripts, or changing system-wide settings.
Why it was flagged
The skill explicitly instructs installing software with sudo, starting services, and changing system configuration (NGINX, iptables, systemd, firewall rules, cert files), all of which require elevated privileges and modify the host state.
Low
Low-risk findings.
1 low severity finding. Worth noting, but not necessarily harmful.
W012: Unverifiable external dependency detected (runtime URL that controls agent).
What this means
The skill fetches instructions or code from an external URL at runtime, and the fetched content directly controls the agent’s prompts or executes code. This dynamic dependency allows the external source to modify the agent’s behavior without any changes to the skill itself.
Why it was flagged
SKILL.md contains a runtime installation instruction that executes remote code via "curl https://sliver.sh/install | sudo bash", which fetches and runs a remote installer the workflow relies on.
- Repository
- mukul975/Anthropic-Cybersecurity-Skills
- Commit
e612f49
- Audited
- Security analysis
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