What it detects01
What does 'Favicon URLs Missing or Empty' indicate?
It indicates that no favicon URLs were detected or recorded for the domain during crawling, preventing favicon-based fingerprint analysis.
Favicon URLs Missing or Empty
It indicates that no favicon URLs were detected or recorded for the domain during crawling, preventing favicon-based fingerprint analysis.
Analyst Q&A
What this signal answers
The questions every analyst asks before acting on this signal.
Why it matters02
Why is this considered a risky signal?
Missing favicon URLs are common in incomplete, misconfigured, or intentionally minimal web infrastructures, including short-lived or evasive setups.
How analysts use it03
How should SOC analysts use this label?
Use it as a weak uncertainty signal and rely on other HTTP, DNS, or WHOIS indicators for assessment.
Often paired with:alert_only
Evidence shape
What Favicon URLs Missing or Empty looks like in the response
A realistic shape of the entry the engine appends to the risk_signals array when this signal fires. Evidence keys are subgroup-default; per-signal overrides documented in the API reference.
json
{
"slug": "favicon_urls_missing_or_empty",
"name": "Favicon URLs Missing or Empty",
"group": "http_crawling_history",
"subgroup": "favicon_behaviour",
"direction": "malicious",
"evidence": {
"favicon_hash": "-1293291467",
"unique_hash_count_90d": 3,
"favicon_domain": "cdn-login-assets[.]top",
"hosting_type": "third_party",
"service_match": false
}
}Siblings
Peers in Favicon Behavior
16 other signals share the same subgroup. They detect related behaviors and often co-fire on the same IOC.
Favicon Hosted on CDN
It indicates that the favicon is served from a domain different from the analyzed website, implying third-party hosting.
Safe
Medium Lexical Risk
It represents an aggregated assessment of lexical and structural risk indicators observed in the favicon URL and its hos…
Malicious
Favicon Domain Malware (Security Vendors)
It indicates that one or more reputable security vendors have classified the favicon host domain as associated with malw…
MaliciousCore
Favicon Domain Malware Source
It indicates that the domain hosting the favicon has been directly observed serving malware payloads, exploit code, or m…
MaliciousCore
In the wild
See Favicon URLs Missing or Empty fire on real IOCs
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