InferenceWall Detection Signature Catalog

InferenceWall ships with 100 built-in detection signatures spanning 5 threat categories: prompt injection, content safety, data leakage, system prompt, and agentic. Every signature is mapped to the MITRE ATLAS adversarial AI threat framework (v5.5, March 2026).

Category Summary

Category	Signatures	ID Prefix	Subcategories	Direction
Prompt Injection	67	`INJ`	D (direct), I (indirect), O (obfuscation), S (semantic)	Input
Content Safety	9	`CS`	T (toxicity), B (bias)	Input / output
Data Leakage	14	`DL`	P (PII), S (secrets)	Output
System Prompt	4	`SP`	—	Input / output
Agentic	6	`AG`	—	Input

Detection Profiles

Each profile activates a different set of engines, which determines which signatures run:

Profile	Engines	Signatures active	Latency
Lite	Heuristic (Rust)	75 heuristic signatures	<0.3 ms p99
Standard	+ DeBERTa + DistilBERT + FAISS	+ 11 classifier + 10 semantic	<80 ms p99
Full	+ LLM-Judge	+ composite (ambiguous inputs only)	<2 s p99

MITRE ATLAS Technique Coverage

All 100 signatures map to one or more MITRE ATLAS techniques. The table below lists every covered technique, its name, and the number of signatures mapped to it.

Technique ID	Name	Signatures
AML.T0051.000	LLM Prompt Injection: Direct	30
AML.T0051.001	LLM Prompt Injection: Indirect	10
AML.T0054	LLM Jailbreak	20
AML.T0068	LLM Prompt Obfuscation	18
AML.T0056	LLM Meta Prompt Extraction	6
AML.T0065	LLM Prompt Crafting	10
AML.T0057	LLM Data Leakage	16
AML.T0055	Unsecured Credentials	6
AML.T0048.002	External Harms: Societal	3
AML.T0048.003	External Harms: User Harm	6
AML.T0024	Exfiltration via AI Inference API	1
AML.T0069	Discover LLM System Information	1
AML.T0053	AI Agent Tool Invocation	3
AML.T0080	AI Agent Context Poisoning	1
AML.T0105	Escape to Host	2
AML.T0086	Exfiltration via AI Agent Tool	1

InferenceWall implements these ATLAS mitigations across all signatures:

AML.M0015 Adversarial Input Detection
AML.M0020 Generative AI Guardrails
AML.M0006 Ensemble Methods

Full Catalog

Prompt Injection (67 signatures)

Direct Injection — INJ-D (30 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
INJ-D-001	Role-Play Persona Jailbreak	heuristic	high	low	8	AML.T0054, AML.T0051.000
INJ-D-002	Instruction Override	heuristic	high	high	7	AML.T0051.000
INJ-D-003	Delimiter Escape	heuristic	high	high	6	AML.T0051.000
INJ-D-004	Few-Shot Poisoning	classifier	medium	medium	5	AML.T0051.000
INJ-D-005	Multi-Turn Escalation	composite	high	medium	9	AML.T0051.000, AML.T0051.002
INJ-D-006	Hypothetical Framing	heuristic	medium	medium	5	AML.T0054, AML.T0051.000
INJ-D-007	Translation Bypass	classifier	medium	medium	6	AML.T0068, AML.T0051.000
INJ-D-008	System Prompt Extraction	heuristic	critical	high	10	AML.T0056, AML.T0051.000
INJ-D-009	Authority Impersonation	heuristic	high	high	7	AML.T0051.000
INJ-D-010	Emotional Manipulation	heuristic	medium	medium	4	AML.T0054, AML.T0051.000
INJ-D-011	Fictional Scenario Framing	heuristic	medium	medium	5	AML.T0054, AML.T0051.000
INJ-D-012	Grandma Exploit	heuristic	medium	medium	5	AML.T0054
INJ-D-013	Research/Academic Framing	heuristic	low	medium	3	AML.T0054, AML.T0051.000
INJ-D-014	Confidential Data Extraction	heuristic	high	medium	7	AML.T0057, AML.T0051.000
INJ-D-015	Threat & Coercion Injection	heuristic	critical	high	8	AML.T0051.000
INJ-D-016	Safety Protocol Bypass	heuristic	critical	high	8	AML.T0054, AML.T0051.000
INJ-D-017	Uncensored Unrestricted Mode	heuristic	high	high	7	AML.T0054
INJ-D-018	Named Jailbreak Personas	heuristic	critical	high	9	AML.T0054
INJ-D-019	Immersive Roleplay Jailbreak	heuristic	high	high	7	AML.T0054
INJ-D-020	Context Pivot / New Task	heuristic	medium	medium	6	AML.T0051.000
INJ-D-021	Amoral / Evil Bot Framing	heuristic	critical	high	8	AML.T0054
INJ-D-022	Debug / Developer Mode Activation	heuristic	critical	high	8	AML.T0054, AML.T0051.000
INJ-D-023	Dual Response Jailbreak	heuristic	medium	high	6	AML.T0054
INJ-D-024	Rule Override Declaration	heuristic	medium	high	6	AML.T0051.000
INJ-D-025	Creative Writing Pivot to Exploit	heuristic	medium	medium	5	AML.T0054, AML.T0051.000
INJ-D-026	Reverse Psychology / Negative Framing	heuristic	medium	medium	5	AML.T0054, AML.T0051.000
INJ-D-027	Model / Prompt Extraction	heuristic	high	high	7	AML.T0056, AML.T0051.000
INJ-D-028	Game / Hypothetical Framing	heuristic	medium	medium	6	AML.T0054, AML.T0051.000
INJ-D-029	Coercive Threat Pattern	heuristic	critical	high	12	AML.T0051.000
INJ-D-030	Direct System Access Demand	heuristic	high	high	10	AML.T0051.000

Indirect Injection — INJ-I (10 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
INJ-I-001	Hidden Text Injection	heuristic	critical	high	10	AML.T0051.001, AML.T0068
INJ-I-002	HTML/CSS Attribute Injection	heuristic	high	high	8	AML.T0051.001
INJ-I-003	Markdown Injection	heuristic	high	high	7	AML.T0051.001
INJ-I-004	RAG Document Poisoning	composite	critical	high	10	AML.T0051.001, AML.T0070
INJ-I-005	Tool Response Injection	classifier	critical	high	10	AML.T0051.001, AML.T0053
INJ-I-006	URL/Link Injection	heuristic	high	high	7	AML.T0051.001
INJ-I-007	Image Alt Text Injection	heuristic	high	high	8	AML.T0051.001
INJ-I-008	PDF Content Injection	heuristic	high	high	8	AML.T0051.001
INJ-I-009	Code Comment Injection	heuristic	medium	medium	5	AML.T0051.001
INJ-I-010	JSON/XML Payload Injection	heuristic	high	high	7	AML.T0051.001

Obfuscation — INJ-O (17 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
INJ-O-001	Base64 Encoding	heuristic	high	medium	6	AML.T0068
INJ-O-002	ROT13 / Substitution Cipher	heuristic	medium	medium	5	AML.T0068
INJ-O-003	Token Smuggling	classifier	high	medium	7	AML.T0068, AML.T0051.000
INJ-O-004	Payload Splitting	composite	high	medium	7	AML.T0068, AML.T0051.000
INJ-O-005	Homoglyph Substitution	heuristic	medium	medium	5	AML.T0068
INJ-O-006	Adversarial Suffix	heuristic	high	medium	8	AML.T0068, AML.T0043.001
INJ-O-007	Emoji Encoding	heuristic	medium	medium	4	AML.T0068
INJ-O-008	Language Switch Bypass	composite	high	medium	7	AML.T0068
INJ-O-009	Low-Resource Language Injection	classifier	medium	medium	6	AML.T0068
INJ-O-010	Leetspeak/Number Substitution	heuristic	medium	medium	4	AML.T0068
INJ-O-011	Morse Code Encoding	heuristic	low	medium	3	AML.T0068
INJ-O-012	Reversed Text	heuristic	medium	medium	5	AML.T0068
INJ-O-013	Whitespace/Tab Encoding	heuristic	medium	medium	5	AML.T0068
INJ-O-014	Pig Latin/Word Games	heuristic	low	medium	3	AML.T0068
INJ-O-015	German Injection Patterns	heuristic	high	high	7	AML.T0068, AML.T0051.000
INJ-O-016	Spanish/French/Multilingual Injection	heuristic	high	high	7	AML.T0068, AML.T0051.000
INJ-O-017	Typo-Obfuscated Injection Commands	heuristic	high	medium	7	AML.T0068, AML.T0051.000

Semantic — INJ-S (10 signatures)

Semantic signatures use FAISS + MiniLM embeddings to catch paraphrased attacks that bypass keyword and regex detection. They require the Standard or Full profile.

ID	Name	Engine	Severity	Confidence	Points	ATLAS
INJ-S-001	Paraphrased Instruction Override	semantic	high	high	8	AML.T0051.000, AML.T0065
INJ-S-002	Paraphrased System Prompt Extraction	semantic	high	high	9	AML.T0056, AML.T0065
INJ-S-003	Paraphrased Role Hijacking	semantic	high	high	8	AML.T0054, AML.T0065
INJ-S-004	Social Engineering for Data	semantic	high	high	9	AML.T0057, AML.T0065
INJ-S-005	Hypothetical Framing Attack	semantic	high	high	7	AML.T0054, AML.T0065
INJ-S-006	Emotional Manipulation	semantic	high	high	7	AML.T0051.000, AML.T0065
INJ-S-007	Authority Urgency Pressure	semantic	high	high	8	AML.T0051.000, AML.T0065
INJ-S-008	Multi-Step Escalation	semantic	high	high	8	AML.T0051.002, AML.T0065
INJ-S-009	Output Format Manipulation	semantic	high	high	7	AML.T0051.000, AML.T0065
INJ-S-010	Indirect Injection via Tool Output	semantic	high	high	9	AML.T0051.001, AML.T0065

Content Safety (9 signatures)

Toxicity — CS-T (7 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
CS-T-001	Hate Speech	classifier	critical	high	10	AML.T0048.002
CS-T-002	Threats and Violence	classifier	critical	high	10	AML.T0048.003
CS-T-003	Sexual Content	classifier	high	high	8	AML.T0048.003
CS-T-004	Self-Harm Content	classifier	critical	high	10	AML.T0048.003
CS-T-005	CSAM/Child Exploitation Keywords	heuristic	critical	high	15	AML.T0048.003
CS-T-006	Weapons/Explosives Instructions	heuristic	critical	high	10	AML.T0048.003
CS-T-007	Drug Manufacturing Instructions	heuristic	high	high	8	AML.T0048.003

Bias — CS-B (2 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
CS-B-001	Demographic Bias	classifier	medium	medium	5	AML.T0048.002
CS-B-002	Stereotypical Outputs	classifier	medium	medium	5	AML.T0048.002

Data Leakage (14 signatures)

All data leakage signatures run on output (LLM responses).

PII — DL-P (8 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
DL-P-001	Email Addresses	heuristic	medium	high	4	AML.T0057
DL-P-002	Phone Numbers	heuristic	medium	high	4	AML.T0057
DL-P-003	SSN Patterns	heuristic	critical	high	12	AML.T0057
DL-P-004	Credit Card Numbers	heuristic	critical	high	12	AML.T0057
DL-P-005	Physical Addresses	heuristic	medium	medium	4	AML.T0057
DL-P-006	Date of Birth Patterns	heuristic	medium	medium	4	AML.T0057
DL-P-007	IP Addresses	heuristic	low	high	3	AML.T0057
DL-P-008	Medical Record Numbers	heuristic	high	high	8	AML.T0057

Secrets — DL-S (6 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
DL-S-001	API Keys	heuristic	critical	high	12	AML.T0057, AML.T0055
DL-S-002	Connection Strings	heuristic	critical	high	12	AML.T0057, AML.T0055
DL-S-003	JWT Tokens	heuristic	high	high	8	AML.T0057, AML.T0055
DL-S-004	Private Keys	heuristic	critical	high	15	AML.T0057, AML.T0055
DL-S-005	AWS Credentials	heuristic	critical	high	12	AML.T0057, AML.T0055
DL-S-006	Database Credentials	heuristic	critical	high	12	AML.T0057, AML.T0055

System Prompt (4 signatures)

ID	Name	Engine	Direction	Severity	Confidence	Points	ATLAS
SP-001	System Prompt Leak in Output	heuristic	output	critical	high	12	AML.T0056
SP-002	Confidentiality Marker Leak	heuristic	output	high	high	8	AML.T0056
SP-003	Training Data Extraction	heuristic	input	high	high	7	AML.T0024
SP-004	Model Architecture Probing	heuristic	input	low	medium	3	AML.T0069

Agentic (6 signatures)

ID	Name	Engine	Severity	Confidence	Points	ATLAS
AG-001	Tool Abuse	heuristic	high	high	8	AML.T0053
AG-002	Recursive Agent Injection	heuristic	critical	high	10	AML.T0080
AG-003	Privilege Escalation	heuristic	high	high	8	AML.T0053, AML.T0102
AG-004	Unauthorized File System Access	heuristic	critical	high	12	AML.T0105
AG-005	Shell Command Injection	heuristic	critical	high	12	AML.T0105, AML.T0102
AG-006	Exfiltration via Agent	heuristic	high	high	8	AML.T0086

Signature Fields Reference

Every signature YAML file declares the following fields:

Field	Description	Example values
`signature.id`	Unique identifier in `{CATEGORY}-{SUBCATEGORY}-{NUMBER}` format	`INJ-D-002`, `DL-S-001`
`signature.name`	Human-readable name	`Instruction Override`
`signature.version`	Semver version string	`"1.0.0"`
`meta.category`	Threat category	`prompt-injection`, `content-safety`, `data-leakage`, `agentic`, `system-prompt`
`meta.subcategory`	Category-specific subcategory	`direct`, `indirect`, `obfuscation`, `semantic`
`meta.technique`	Specific technique name	`role-play-persona`, `keyword-match`
`meta.severity`	Severity level	`critical`, `high`, `medium`, `low`, `info`
`meta.confidence`	Detection confidence	`high`, `medium`, `low`
`meta.performance_cost`	Compute cost per scan	`low` (<1 ms), `medium` (1–50 ms), `high` (>50 ms)
`meta.atlas`	MITRE ATLAS technique IDs	`["AML.T0051.000", "AML.T0054"]`
`detection.engine`	Detection engine	`heuristic`, `classifier`, `semantic`, `llm-judge`, `composite`
`detection.direction`	Which traffic to scan	`input`, `output`, `bidirectional`
`detection.patterns`	List of patterns to match	`regex`, `substring`, `semantic`, `perplexity`, `encoding`, `unicode`
`detection.condition`	How patterns combine	`any` (OR), `all` (AND), `weighted`
`scoring.anomaly_points`	Points added to the anomaly score on match	`1`–`15`
`tuning.default_action`	Default enforcement mode	`enforce`, `monitor`

Severity and Confidence Levels

Severity reflects the risk if the threat is real:

Level	Anomaly points (typical)	Examples
`critical`	8–15	Private key in output, CSAM keywords, system prompt leak
`high`	6–9	Instruction override, API key in output, shell injection
`medium`	4–6	Hypothetical framing, base64 encoding, demographic bias
`low`	2–3	IP address in output, model architecture probing
`info`	0–1	Informational signals, no direct action

Confidence reflects how certain the engine is that a true positive was detected. Low-confidence matches contribute fewer effective points due to confidence-weighted scoring.

Licenses

Engine code (Rust, Python, CLI, API): Apache-2.0
Community signatures (catalog/): CC BY-SA 4.0 — modifications must be shared back under the same license

To add your own signatures or override built-in ones, see the Custom Signatures guide.

Get Started

Core Concepts

Integrations

Guides

Reference

InferenceWall Detection Signature Catalog

Category Summary

Detection Profiles

MITRE ATLAS Technique Coverage

Full Catalog

Prompt Injection (67 signatures)

Direct Injection — INJ-D (30 signatures)

Indirect Injection — INJ-I (10 signatures)

Obfuscation — INJ-O (17 signatures)

Semantic — INJ-S (10 signatures)

Content Safety (9 signatures)

Toxicity — CS-T (7 signatures)

Bias — CS-B (2 signatures)

Data Leakage (14 signatures)

PII — DL-P (8 signatures)

Secrets — DL-S (6 signatures)

System Prompt (4 signatures)

Agentic (6 signatures)

Signature Fields Reference

Severity and Confidence Levels

Licenses

Get Started

Core Concepts

Integrations

Guides

Reference

​Category Summary

​Detection Profiles

​MITRE ATLAS Technique Coverage

​Full Catalog

​Prompt Injection (67 signatures)

​Direct Injection — INJ-D (30 signatures)

​Indirect Injection — INJ-I (10 signatures)

​Obfuscation — INJ-O (17 signatures)

​Semantic — INJ-S (10 signatures)

​Content Safety (9 signatures)

​Toxicity — CS-T (7 signatures)

​Bias — CS-B (2 signatures)

​Data Leakage (14 signatures)

​PII — DL-P (8 signatures)

​Secrets — DL-S (6 signatures)

​System Prompt (4 signatures)

​Agentic (6 signatures)

​Signature Fields Reference

​Severity and Confidence Levels

​Licenses

Category Summary

Detection Profiles

MITRE ATLAS Technique Coverage

Full Catalog

Prompt Injection (67 signatures)

Direct Injection — INJ-D (30 signatures)

Indirect Injection — INJ-I (10 signatures)

Obfuscation — INJ-O (17 signatures)

Semantic — INJ-S (10 signatures)

Content Safety (9 signatures)

Toxicity — CS-T (7 signatures)

Bias — CS-B (2 signatures)

Data Leakage (14 signatures)

PII — DL-P (8 signatures)

Secrets — DL-S (6 signatures)

System Prompt (4 signatures)

Agentic (6 signatures)

Signature Fields Reference

Severity and Confidence Levels

Licenses