building-c2-infrastructure-with-sliver-framework
Build and configure a resilient command-and-control infrastructure using BishopFox's Sliver C2 framework with redirectors, HTTPS listeners, and multi-operator support for authorized red team engagements.
69
62%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Critical
Do not install without reviewing
Optimize this skill with Tessl
npx tessl skill review --optimize ./skills/building-c2-infrastructure-with-sliver-framework/SKILL.mdSecurity
4 findings — 2 critical severity, 2 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
Suspicious download URL detected (high risk: 0.95). Both URLs are distribution/command-and-control endpoints: sliver.sh/install serves an install script for the Sliver C2 framework (a powerful offensive tool whose installer is effectively malware if run outside an authorized test environment) and c2.example.com is used as a C2/redirector domain — together they represent high-risk sources for delivering implants and should only be accessed in authorized lab/red-team contexts.
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
Malicious code pattern detected (high risk: 1.00). Comprehensive, actionable C2 build and implant-generation guide that directly instructs how to deploy command‑and‑control servers, generate beacons/shellcode, set up redirectors/domain‑fronting, and run post‑exploitation tooling (e.g., mimikatz, in‑memory execution, pivots), enabling backdoors, remote code execution, credential theft and data exfiltration—highly dangerous dual‑use content readily abusable for malicious operations.
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
Potentially malicious external URL detected (high risk: 0.90). The skill explicitly instructs running a remote install script that is fetched and executed at setup time—curl https://sliver.sh/install | sudo bash—which downloads and runs remote code and the provided scripts depend on Sliver being installed, so this is a runtime-executed external dependency.
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
Attempt to modify system services in skill instructions detected (high risk: 1.00). The prompt explicitly instructs using sudo to install software, starting system services, editing system configs (NGINX, certs), altering firewall/iptables rules, and generating C2 implants—actions that require elevated privileges and modify the machine state, so it must be flagged.
- Repository
- mukul975/Anthropic-Cybersecurity-Skills
- Commit
c15f73d
- Audited
- Security analysis
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