Publish Layerfault deep challenge LF-CH-EVAS-0006

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "package-evasion"
+  ],
+  "control_type": "compound",
+  "corpus_id": "LF-CH-EVAS-0006",
+  "difficulty": "compound",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-PACKAGE-FRAGMENTED-SIGNAL"
+  ],
+  "related_cases": [],
+  "repo_name": "evasion-base64-split-marker",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "high",
+  "techniques": [
+    "fragmented-marker",
+    "base64"
+  ],
+  "transformations": [
+    "fragmentation",
+    "base64"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "config.json",
+    "assets/fragment-0.txt",
+    "assets/fragment-1.txt",
+    "assets/fragment-2.txt",
+    "assets/index.json"
+  ],
+  "family": "evasion",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "evasion-base64-split-marker"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "package-evasion"
+    ],
+    "control_type": "compound",
+    "difficulty": "compound",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-PACKAGE-FRAGMENTED-SIGNAL"
+    ],
+    "related_cases": [],
+    "severity": "high",
+    "techniques": [
+      "fragmented-marker",
+      "base64"
+    ],
+    "transformations": [
+      "fragmentation",
+      "base64"
+    ]
+  },
+  "corpus_id": "LF-CH-EVAS-0006",
+  "description": "Marker is split and base64 encoded across several files.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "evasion-base64-split-marker",
+  "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-base64-split-marker
+
+> **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-0006`
+
+## Purpose
+
+Marker is split and base64 encoded across several files.
+
+## 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.
+
+- None
+
+## 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: **compound**
+- Expected admission decision: **BLOCK**
+- Control type: **compound**
+- Attack surface: package-evasion
+- Techniques: fragmented-marker, base64
+- Transformations: fragmentation, base64
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-PACKAGE-FRAGMENTED-SIGNAL`
+
+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": "d5065fa0cd4e37f8735772f0dea10ac7e5a155744f49d340183d54f6347a59d0",
+    "size": 654
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "c2bc3e0f35686e892bf2525d8f8411a7a8069c7a371db0bd264269ed9da7d4f3",
+    "size": 314
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "03b34070e278e52bdfcdf31cef375742b5daba4aeefb6a9c57b92099cba8a9b3",
+    "size": 920
+  },
+  {
+    "path": "README.md",
+    "sha256": "6fc4321746378673d29ec45854689e3091adda2e1296a07a6d6ba868caaf625a",
+    "size": 2259
+  },
+  {
+    "path": "assets/fragment-0.txt",
+    "sha256": "48d94fa9fb14db72fbe9e9815e4920b4e8850590ee9db7b8b07afa65b19255fc",
+    "size": 21
+  },
+  {
+    "path": "assets/fragment-1.txt",
+    "sha256": "d95029e789b34136ca728b46d3faa7f6840b09ef1287918d7af877444f832948",
+    "size": 21
+  },
+  {
+    "path": "assets/fragment-2.txt",
+    "sha256": "99abe33545e31ff3630987f8afaf185936237b6f413fecb96d9d4c1f4b15bd7a",
+    "size": 25
+  },
+  {
+    "path": "assets/index.json",
+    "sha256": "6c5a5c37e0c6ea4135b0117e4ab6fe911f86eca05555d0d11f817a54fad7a94c",
+    "size": 65
+  },
+  {
+    "path": "config.json",
+    "sha256": "68d4b6c3308015c36332de690b727c02878531e6440ced97fcf1fd1a46d41704",
+    "size": 88
+  }
+]

assets/fragment-0.txt

@@ -0,0 +1 @@
+TEFZRVJGQVVMVF9GSVhU

assets/fragment-1.txt

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+VVJFOmV2YXNpb24tYmFz

assets/fragment-2.txt

@@ -0,0 +1 @@
+ZTY0LXNwbGl0LW1hcmtlcg==

assets/index.json

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+{
+  "encoding": "base64",
+  "order": [
+    0,
+    1,
+    2
+  ]
+}

config.json

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