{
  "family": "e2f3f4d",
  "sample_count": 1,
  "category": "ransomware",
  "description": "<h3>Executive Summary</h3>\n\"e2f3f4d\" (and similar purely hexadecimal strings) represents a strict, static hash-based detection signature utilized by antivirus engines. It does not identify a named malware family, but rather acts as a direct blocklist entry for a specific, known malicious file whose cryptographic hash (like MD5 or SHA-256) matches the identifier.\n\n<h3>Static Detection and Technical Context</h3>\nUnlike heuristic detections (which analyze behavior), a hash-based detection like \"e2f3f4d\" means the endpoint protection platform (EPP) has encountered a file that is an exact, byte-for-byte match with a piece of malware that has been previously analyzed and definitively classified as malicious by the security vendor.\n\nThe implications of a hash-based detection include:\n<ul>\n<li><strong>High Confidence:</strong> Hash detections have an extremely low false-positive rate. If a file triggers this alert, it is almost certainly malicious.</li>\n<li><strong>Lack of Context:</strong> While the detection is highly accurate, the identifier itself provides no context about what the malware actually does (e.g., whether it is an info-stealer, ransomware, or adware).</li>\n<li><strong>Evasion Vulnerability:</strong> Hash-based detections are easily bypassed by malware authors. Changing a single byte of the malicious executable (e.g., recompiling it or adding a null byte) completely alters the resulting hash, rendering the static signature useless.</li>\n</ul>\n\n<h3>Threat Impact and Response</h3>\nWhile the alert confirms the presence of known malware, responders must treat it as a critical indicator that perimeter defenses were bypassed. The primary concern is whether the file was blocked pre-execution or if the hash was only detected during a post-execution sweep.\n\n<h3>Incident Mitigation Strategy</h3>\n<ul>\n<li><strong>Verify Execution Status:</strong> Check the EDR logs immediately to determine if the EPP successfully blocked the file from executing, or if it was only flagged after the process was already running.</li>\n<li><strong>Hash Lookups:</strong> Take the full SHA-256 hash associated with the alert and query it against threat intelligence platforms (like VirusTotal) to identify the true malware family and obtain actionable context on its capabilities.</li>\n<li><strong>Endpoint Sweeps:</strong> Utilize the identified hash as an Indicator of Compromise (IOC) to sweep the entire enterprise network, ensuring the specific malicious file has not been dropped on other hosts.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Trojan.Hash",
    "Malware.e2f3f4d"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [],
  "cisa_advisory": null,
  "last_updated": "2026-07-01T16:35:09Z",
  "type": "Generic",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}