About

Imported from CyberStrikeus/CyberStrike (.cyberstrike/skill/NIST/SP800-53_rev5/AT_awareness-and-training/at-3-4-suspicious-communications-and/SKILL.md). Install upstream with npx skills add CyberStrikeus/CyberStrike --skill at-3-4-suspicious-communications-and. Copyright stays with the author.

AT-3(4) Suspicious Communications and Anomalous System Behavior

Name: AT-3(4)_suspicious-communications-and-anomalous-system-behavior
Author: CyberStrikeus

Enhancement of: AT-3

High-Level Description

Family: Awareness and Training (AT) Framework: NIST SP 800-53 Rev 5

No description available.

What to Check

Verify AT-3(4) Suspicious Communications and Anomalous System Behavior is documented in SSP
Confirm control is operating effectively
Review evidence of continuous monitoring for AT-3(4)
Verify enhancement builds upon base control AT-3

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for AT-3(4) implementation details. Verify the organization has documented how this control is satisfied.

Step 2: Validate Implementation

# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null

Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

Tools

Tool	Purpose	Usage
Manual Review	Documentation and interview-based	N/A

Remediation Guide

Control Statement

Refer to NIST SP 800-53 Rev 5 for the full control statement.

Implementation Guidance

Implement this control per organizational risk assessment and system categorization.

Risk Assessment

Finding	Severity	Impact
AT-3(4) Suspicious Communications and Anomalous System Behavior not implemented	Medium	Awareness and Training
AT-3(4) partially implemented	Low	Incomplete Awareness and Training

CWE Categories

CWE ID	Title
N/A	No direct CWE mapping

References

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (none) reviewed

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/cyberstrikeus-cyberstrike-at-3-4-suspicious-communications-and/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

cyberstrikeus-cyberstrike-at-3-4-suspicious-communications-and.ocm.jsonjson

{
  "ocm": "1",
  "id": "cyberstrikeus-cyberstrike-at-3-4-suspicious-communications-and",
  "kind": "skill",
  "name": "AT-3(4)_suspicious-communications-and-anomalous-system-behavior",
  "description": "Suspicious Communications and Anomalous System Behavior",
  "publisher": "CyberStrikeus",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "skill-md",
      "nist",
      "sp800-53",
      "rev5",
      "at-3-4",
      "at",
      "enhancement",
      "github"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Suspicious Communications and Anomalous System Behavior"
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "github",
      "repository": "https://github.com/CyberStrikeus/CyberStrike",
      "path": ".cyberstrike/skill/NIST/SP800-53_rev5/AT_awareness-and-training/at-3-4-suspicious-communications-and/SKILL.md",
      "ref": "df28ccd3dc6d6c02391169121ee2dcdf4a6a132b",
      "url": "https://github.com/CyberStrikeus/CyberStrike/blob/df28ccd3dc6d6c02391169121ee2dcdf4a6a132b/.cyberstrike/skill/NIST/SP800-53_rev5/AT_awareness-and-training/at-3-4-suspicious-communications-and/SKILL.md",
      "key": "CyberStrikeus/CyberStrike/.cyberstrike/skill/NIST/SP800-53_rev5/AT_awareness-and-training/at-3-4-suspicious-communications-and/SKILL.md"
    }
  },
  "instructions": "# AT-3(4) Suspicious Communications and Anomalous System Behavior\n\n> **Enhancement of:** AT-3\n\n## High-Level Description\n\n**Family:** Awareness and Training (AT)\n**Framework:** NIST SP 800-53 Rev 5\n\nNo description available.\n\n## What to Check\n\n- [ ] Verify AT-3(4) Suspicious Communications and Anomalous System Behavior is documented in SSP\n- [ ] Confirm control is operating effectively\n- [ ] Review evidence of continuous monitoring for AT-3(4)\n- [ ] Verify enhancement builds upon base control AT-3\n\n## How to Test\n\n### Step 1: Review Documentation\n\nExamine the System Security Plan (SSP) and rel",
  "cost": {
    "context_tokens": 700
  }
}

Fetch it by URL: GET /api/v1/registry/cyberstrikeus-cyberstrike-at-3-4-suspicious-communications-and/manifest?version=1.0.0

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