Publish Layerfault deep challenge LF-CH-EVAS-0008

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "package-evasion"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-EVAS-0008",
+  "difficulty": "adversarial",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [
+      "LF-CODE-SUBPROCESS",
+      "LF-PY-CALL-PROCESS"
+    ],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-PACKAGE-OBFUSCATED-CAPABILITY"
+  ],
+  "related_cases": [],
+  "repo_name": "evasion-python-string-concat-capability",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "high",
+  "techniques": [
+    "python-string-concat"
+  ],
+  "transformations": [
+    "string-splitting"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "config.json",
+    "assets/loader.py"
+  ],
+  "family": "evasion",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "evasion-python-string-concat-capability"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [
+    "LF-CODE-SUBPROCESS",
+    "LF-PY-CALL-PROCESS"
+  ],
+  "challenge": {
+    "attack_surface": [
+      "package-evasion"
+    ],
+    "control_type": "positive",
+    "difficulty": "adversarial",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-PACKAGE-OBFUSCATED-CAPABILITY"
+    ],
+    "related_cases": [],
+    "severity": "high",
+    "techniques": [
+      "python-string-concat"
+    ],
+    "transformations": [
+      "string-splitting"
+    ]
+  },
+  "corpus_id": "LF-CH-EVAS-0008",
+  "description": "Dormant Python capability strings are reconstructed at runtime.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "evasion-python-string-concat-capability",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "verify-package",
+    "target": "."
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# evasion-python-string-concat-capability
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-EVAS-0008`
+
+## Purpose
+
+Dormant Python capability strings are reconstructed at runtime.
+
+## Direct expected Layerfault rules
+
+- None; this repository is a control/comparison input.
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- `LF-CODE-SUBPROCESS`
+- `LF-PY-CALL-PROCESS`
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- None
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **high**
+- Difficulty: **adversarial**
+- Expected admission decision: **BLOCK**
+- Control type: **positive**
+- Attack surface: package-evasion
+- Techniques: python-string-concat
+- Transformations: string-splitting
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-PACKAGE-OBFUSCATED-CAPABILITY`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SHA256SUMS.json

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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "a74440e1556b83ac4423456484d5b14b4a8f6055c73763046e112cfcaa103f55",
+    "size": 711
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "63fdb98d8a4d460efd64aa5439c872c8e0ab56bfc7cd9a41abaff830e0159aa1",
+    "size": 238
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "a2ed00904ad72fd4f7e791a5db71c066787f9e76eb6c713a258da7b2c7238ebc",
+    "size": 974
+  },
+  {
+    "path": "README.md",
+    "sha256": "e74e255ce1d007d84408e44cddee39451dd85b74fd691f3b5c8fafbb697c4a94",
+    "size": 2314
+  },
+  {
+    "path": "assets/loader.py",
+    "sha256": "d2ad465db9a9a886629e78d66009b02bf41ca588fb716b5cd0083c16182adfa3",
+    "size": 362
+  },
+  {
+    "path": "config.json",
+    "sha256": "68d4b6c3308015c36332de690b727c02878531e6440ced97fcf1fd1a46d41704",
+    "size": 88
+  }
+]

assets/loader.py

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+# Synthetic dormant capability fixture. Nothing executes at import time.
+def dormant_fixture():
+    module_name = "sub" + "process"
+    function_name = "r" + "un"
+    module = __import__(module_name)
+    fn = getattr(module, function_name)
+    return fn(["python", "--version"], check=False)
+MARKER = 'LAYERFAULT_FIXTURE:evasion-python-string-concat-capability'

config.json

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+{
+  "asset_root": "assets",
+  "fixture": true,
+  "model_type": "layerfault_challenge"
+}